do an dung plc dieu khien den giao thong
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7/31/2019 Do an Dung Plc Dieu Khien Den Giao Thong
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Li ni u
Hin nay s tin b khoa hc k thut trn th gii din ra
nhanh chng, vi s ra i ca hng lot nhng sn phm mi ng
dng nhng tin b nhng nc pht trin.c bit trong nhng
nm gn y k thut iu khin pht trin mnh m, c nhiug
cng ngh iu khin mi c ra i thay th cho nhng
cng ngh li thi.
bt kp vi tin b khoa hc k thut trn th gii cng nh
p ng yu cu CNH_HH t nc th ngnh cng nghip Vit
Nam ang thay i nhanh chng, cng ngh v thit b hin
i ang dn dn c thay th cc cng ngh lc hu v thit b
c. Cc thit b cng ngh tin tin vi h thng iu khin lp
trnh PLC, Vi x l, in kh nn, in t. ang c ng dngrng ri trong cng nghip nh cc dy truyn xn xut nc ngt,
ch bin thc n gia xc, my iu khin theo chng trnh CNC,
cc h thng n giao thng, cc h thng bo ng. Trong cc
trng i hc, cao ng v cc trng trung hc v ang a
cc thit b hin i c kh nng lp trnh c vo ging dy.
Mt trong nhng loi thit b c ng dng mnh m v m bo
c tin cy cao l h thng iu khin t ng PLC.
Vi ti Thit k m hnh h thng iu khin
n giao thng ti ng t . Chng em vn dng c nhng -u im ca h thng iu khin ny c hiu qu cao. iu c
bit l tng ny c ng dng trong thc t rt nhiu. Bi v
hin trng giao thng Vit Nam cn rt th s, lc hu, ngi tham
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gia giao thng khng i theo ng nguyn tc no mi n n
tc ng, tai nn..
Sau qu trnh hc tp rn luyn v nghin cu ti trng chng
em tch lu c vn kin thc thc hin ti ca
mnh. Cng vi s hng dn tn tnh ca thy gio nguyen dinh
khanh, cng nh cc thy c gio trong khoa v cc bn sinh vin
cng kho n nay chng em hon thnh ti ny vi ni
dung sau:
1: Xc nh nhim v iu khin h thng.
2: Gii thiu chung v PLC.3: Thit k ch to m hnh m phng.
4: Vit chng trnh chy cho h thng qua phn mm ng
dng.
5: Hon thnh thuyt minh.
Do thi gian nghin cu c hn nn khng th trnh khi nhng
sai st, chng em rt mong nhn oc s gp , ch dn thm
ca cc thy c cng nh kin ng gp ca cc bn sinh vin
ti ca chng em hon thin hn, p ng y
nhng mc tiu t ra.
Chng em xin chn thnh cm n!
bac giang, ngy 11 thng 6
nm 2010
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Nhn xt ca gio vin hng dn 1
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Nhn xt ca gio vin hng dn 2.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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...................................................................................................DAN NHAP
I.at van e
T ong ngay cang ong vai tro quan trong trong i
song va cong nghiep. Ngay nay nganh t ong a phat
trien ti trnh o cao nh nhng tien bo cua ly thuyetieu khien t ong, cua nhng nganh khac nh ien t,
tin hoc, Nhieu he thong ieu khien a ra i, nhng
phat trien manh va co kha nang phuc vu rong la bo
ieu khien PLC. S d nh the, do bo PLC co nhieu u
iem noi bac so nhng bo ieu khien khac :
n gian, de dang thay oi, lap trnh .
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Tin cay trong moi trng cong nghiep.
Canh tranh c gia thanh vi cac bo dieu khien
khac.Cuoi thap nien 60 xuat hien khai niem ve PLC va a
c phat trien rat nhanh. Nam 1974 PLC a s dung
nhieu bo x ly nh : mach nh thi, bo em, dung lng
nh en 12KB va co 1024 iem nhap xuat. Nam 1976
a gii thieu he thong a tn hieu vao ra t xa. Nam
1977 PLC a dung en vi x ly. Nam1980 phat trien cac
khoi nhap xuat thong minh nang cao ieu khien thuanli qua vien thong, nang cao viec phat trien phan mem,
dung may tnh ca nhan lap trnh. en nam 1985 a
thanh lap mang PLC.
Rieng nc ta sap ti ay hanh rao thue quan khu
vc c loai bo, kinh te m ca hp tac vi nc
ngoai. Trc tnh hnh o, nen cong nghiep se gap
khong t kho khan do con nhieu day chuyen co cong
nghe lac hau. e co cho ng va the manh tren
thng trng, nha nc a ac biet chu trong en ng
dung va phat trien t ong trong san xuat, nham nang
cao nang suat, chat lng san pham va ha gia thanh.
Mot trong nhng phng an tot nhat va c s dung
rong hien nay la thay the nhng he thong o bang boieu khien PLC. e phat trien manh hn na, nhiem vu
at ra hang au la ao tao nhng chuyen gia ve t
ong ieu khien noi chung va ve PLC noi rieng.
La mot ky s ien cong nghiep, cong viec se gan
lien vi ieu khien, van hanh he thong san xuat. Nh
vay, nhng hieu biet ve PLC se tao nhieu thuan li e
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lam viec tot hn. Khi ang con ngoi tren ghe nha
trng, viec tm hieu, nghien cu e nam vng phng
phap lap trnh tren bo PLC rat co y ngha va la ieu
kien tot nhat hoc hoi, tch luy kinh nghiem.
II. Gii han e tai
-Do thi gian nghin cu c hn nn vic tm hiu v PLC v
SIMATIC S7-300 ca SIEMENS cn nhiu thiu st v khng y
.
-Do hon cnh hc tp khng c tip xc nhiu vi PLC nn
trng qua trnh kho st v thc hnh vi PLC cn c nhiu khkhn.
-Do yu cu ca ti xut pht t thc t nn trong khi x l
cc trng hp trong thc t cn c nhiu trng hp khng x l -
c.
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Phu lc
Trang
Li ni u
1
Chng I: khi nim v h thng iu khin
8
I. Khi nim v h thng iu khin.
8
II.Phn loi.8
III. S khc nhau gia cc phng php iu khin
11
VI. B iu khin lp trnh c
12
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Chng II: Gii thiu v PLC s7-300
13
I. i cng v thit b iu khin logic lp trnh PLC.
13
II. H thng iu khin PLC S7 - 300.
18
III. Cu trc b nh ca CPU ca PLC S7 - 300.
25
Chng III k thut lp trnh PLC s7 300
32I.Gii thiu chung
32
II. Ngn ng lp trnh PLC
33
III. Lp trnh v chn ch lm vic cho PLC S7-300.
39
IV. Cc khi, hm v chc nng ca n trong PLC.
41
V. B thi gian
51
VI. B m
57
Chng IV kt ni mng trong PLC61
1. Gii thiu.
61
2. Khai bo mng MPI
61
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3. Mng vo ra phn tn
62
Chng V thit k v ch to m hnh
64
I. Kho st h thng iu khin h thng n giao thng
ti ng t 64
II. Mch in iu khin tng trng thi ca h thng n.
68
III. Mch iu khin bng PLC
74Chng VI ng dng ca PLC
79
Chng i: khi qut chung v h thng iu khin
Khi nim v phn loi v h thng iu khin.
I. Khi nim v iu khin.
iu khin l mt qu trnh ca mt h thng trong di tc
ng ca hay nhiu i lng gi l cc i lng vo, nhng i l-
ng khc gi l i lng ra c thay i theo mt quy lut nht
nh ca h thng .
II. Phn loi.
Hin nay ngi ta chia cng ngh iu khin ra lm hai loichnh l:
* Phng php iu khin ni cng ( iu khin lp tuyn).
* Phng php iu khin lp trnh c.
II.1. Phng php iu khin ni cng ( iu khin lp
tuyn).
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Khi nim: Phng php iu khin ni cng l h thng c
thc hin bi cc phn t t ng ni vi nhau bng cc ng
dy.
Trong iu khin ni cng ngi ta chia lm hai loi: iu
khin ni cng tip im v iu khin ni cng khng tip
im.
a. Ph ng php iu khin ni cng c tip im : Dng cc
kh c in t nh rle, cng tc t vi cc b cm bin, cc n ,
cc cng tc, cc kh c ny c ni li vi nhau theo mt mch
in c th thc hin mt yu cu cng ngh nht nh nhmch i chiu quay, mch khi ng gii hn dng hay mch
iu khin ng c chy tun t v dng tun t.
S cu trc h thng iu khin ni cng c tip
im.
b. Ph ng php iu khin ni cng khng tip im: Dng cc
cng logic c bn a nng hay cc mch tun t ( Gi chung l IC
s ) kt hp vi cc b cm bin, cc n, cng tc - Cc IC s ny
cng c ni li vi nhau theo mt s logic c th thchin mt yu cu cng ngh nht nh. Cc mch iu khin ni
cng s sng cc linh kin in t cng sut, quang tr, triac,
tranzitor thay th cng tc trong cc mch ng lc.
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Cc phnt u vo
Cc phnt iukhin
Cc phnt u ra
Cc tin hiuu vo
Cc phniukhin
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Cu trc h thng iu khin ni cng khng tip im.
Trong h thng iu khin ni cng, cc linh kin hay kh c
in c ni vnh vin vi nhau. Do khi mun thay i li
nhim v iu khin th phi ni dy li ton b mch in. Vi
cc mch phc tp th khng hiu qu v rt tn km.
Phng php diu khin ni cng c thc hin theo cc bc
sau.
II.2.H thng iu khin lp trnh c (PLC)
Trong h thng iu khin lp trnh c cu trc ca b
iu khin v cch ni dy c lp vi chng trnh. ChngGVHD: nguyen dinh khanh SV:giap van thuy
Xc nh yu cu cngngh
Thit k s iukhin
Chn phn t mchin
Rp ni mch, lin kt cc phnt
Lu vo b nh, In thnh tiliu
Chy thkim tra
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trnh c nh ngha hot ng iu khin c ghi trc tip
vo b nh ca b iu khin nh s tr gip ca b lp trnh hay
my vi tnh. thay i chng trnh iu khin ch cn thay
i ni dung b nh ca b iu khin, phn ni dy bn ngoi
khng b nh hng. y l u im ca phng php iu khin
lp trnh c.
Cc b c thi t l p s di u khi n l p trnh:
III. S khc nhau gi a h th ng i u khi n n i c ng v
h th ng i u khi n l p trnh c c th minh ho b ng v
d sau:
GVHD: nguyen dinh khanh SV:giap van thuy
Xc nh yu cu cng
ngh
Thit k thut gii
Son tho chng trnh
Np chng trnh vo b nh
Lu vo b nh, in thnh ti liu
Chy thkim tra
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- i u khi n h th ng 3 my b m n c qua 3 kh i ng t K1,
K2, K3. Trnh t i u khi n nh sau: Cc my b m ho t ng tu n
t ngh a l K1 ng tr c, ti p n l K2 r i cu i cng l K3 ng.
th c hi n nhi m v theo yu c u trn m ch i u khi n ta
c th thi t k nh sau:
Trong cc nt n S1, S2, S3, S4 l cc ph n t nh p tn
hi u.
Cc ti p i mK1, K2, K3 v cc m i lin k t l cc ph n x l.
Cc kh i ng t K1, K2, K3 l k t qu x l.
S i u khi n theo ki u n i c ng:
S1
S2S3 S4
K 1K 2
K 1 K 2 K 3
K 3K 1 K 2
-N u ta thay b ng thi t b i u khi n l p trnh c c
th m t nh sau:
Tn hi u vo S1, S2, S3, S4 v n gi nguyn
Tn hi u ra K1, K2, K3 l cc kh i ng t v n gi nguyn -Ph n x l c thay th b ng thi t b i u khi n l p trnh
c.
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PLCB nh
S1 S2 S3 S4
Ch-ng trnh
IV.B i u khi n l p trnh c.
Khingunnui
B nhch-ngtrnh PLC
B vi x lInput module
I1 I2 I3 I4
Outputmodule
Q1 Q2 Q3
Ch- ngtrnh
B i u khi n l p trnh c(Programble Logic Controler): g i
t t l PLC bao g m cc module sau:
-Kh i x l trung tm CPU v b nh ch ng trnh
-Module xu t nh p(Input / Output)
-H th ng Bus truy n tn hi u
-Kh i ngu n nui
-Module nh p (input module) c n i v i cc cng t c, nt n,
cc b c m bi n i u khi n ch ng trnh t bn ngoi. Cc ng
vo c k hi u theo th t I1, I2, I3
-Module xu t (output module) c n i v i t i ng ra nh
cu n dy r le, cng t c t , n tn hi u, van i n t .. GVHD: nguyen dinh khanh SV:giap van thuy
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-Ch ng trnh i u khi n c n p vo b nh nh s tr gip
c a b l p trnh hay b ng m t my vi tnh.
Chng II gii thiu v PLC - s7 300
I. i cng v thit b iu khin logic lp trnh PLC.
1. Khi nim.
Thit b iu khin logic lp trnh (Programmable Logic
Control , vit tt l PLC ) l loi thit b cho php thc hin linh
hot cc thut ton iu khin s thng qua mt ngn ng lp
trnh. Thay cho vic thc hin thut ton bng mch s nh
vy vi chng trnh iu khin PLC tr thnh mt b iu khin
s nh gn d dng thay i thut ton v c bit d traoi thng tin vi mi trng xung quanh (vi cc PLC khc hay my
tnh). Ton b chng trnh iu khin c lu trong b nh ca
PLC di dng cc khi chng trnh nh khi OB, FC hoc FB, v c
thit lp theo chu k vng qut.
c th thc hin c mt chng trnh iu khin, tt
nhin PLC c tnh nng nh mt my tnh. Ngha l phi c mt b
vi x l (PLC), mt h iu hnh, b nh lu chng trnh iu
khin, d liu v tt nhin phi c cng u vo/ra giao
tip c vi i tng iu khin v trao i thng tin vi mi tr-
ng xung quanh. Bn cnh PLC cn c thm cc khi chc nng
c bit khc nh b m (Counter), b thi gian (Timer) v
cc khi chuyn dng khc.
2. Cu trc ca PLC.GVHD: nguyen dinh khanh SV:giap van thuy
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Thit b iu khin logic lp trnh PLC l thit b iu khin
c bit da trn b vi x l, s dng b nh lp trnh c lu
tr cc lnh v thc hin cc chc nng: php logic, lp chui,
nh gi, m, thut ton iu khin my v cc qu trnh.
Tn hiu
Ng vo
Tn hiu
Ng ra
PLC
Ch-ng trnh
PLc c thit k cho php nhng ngi khng yu cu kin thc
cao v my tnh v ngn ng my tnh c th vn hnh c. Khi
cn iu khin mt bi ton ta ch cn vit chng trnh theo
ngn ng PLC v nhp vo b nh PLC. Thit b iu khin s
gim st cc tn hiu vo /ra theo cc chng trnh ny v thc
hin cc quy tc iu khin lp trnh.
PLC c 5 thnh phn c bn: n v x l trung tm, b nh,
b ngun nui, khi tn hiu vo/ra v thit b lp trnh.
Thit blp trnh
B nh
B x lGiaodinnhp
Giaodinxut
Nguncng xut
S cu trc c bn ca PLC
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3. Cu to PLC.
Mt PLC in hnh c cu to nh hnh v:
RAM(vngnh
ch-ngtrnh)
PLCXungnhp
Khivo /raROM
RAMvng
nh dliu
BUS a ch
BUS iu khin
Pin
Panellp
trnh
Optocuopler
Tip imu ra
Hthng BUS vo ra
Tn hiu vo Tn hiu ra K
BUS dliu
Ta thy cu trc c bn ca PLC bao gm mt b vi x l trungtm CPU, b nh (ROM, RAM), khi vo ra, khi pht xung nhp,
pin v h thng cc BUS.
Ton b hot ng ca PLC c iu khin bi CPU, n c
cung cp bi khi pht xung nhp, do tc ca CPU s ph
thuc vo khi pht xung nhp( thng thng khi pht xung nhp
c tn s vo khong 18 MHz ), xung nhp ny s cung cp cho
tt c cc khi trong PLC ng b ha qu trnh hot ng
ca khi ny vi CPU.
H thng BUS bao gm BUS a ch ( xc nh a ch trn
cc vng nh ), BUS iu khin ( truyn ti cc thng tin iu
khin ), BUS d liu ( truyn ti d liu)v cc BUS vo/ra
( mang thng tin t cc u vo ra).
C bn b nh trong PLC:GVHD: nguyen dinh khanh SV:giap van thuy
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+B nh ROM: l loi b nh khng th thay i c, b nh ny
ch np c mt ln nn t c s dng ph bin nh cc loi b
nh khc.
+B nh RAM: l loi b nh c th thay i c v dng
cha cc chng trnh ng dng cng nh d liu, d liu cha
trong RAM s b mt kh mt in. Tuy nhin, iu ny c th
khc phc bng cch dung Pin.
+B nh EPROM: ging nh RAM, nhun nui cho EPROM khng
cn dung Pin, tuy nhin ni dung cha trong n c th xa bng
cch chiu tia cc tm vo mt ca s nh trn EPROM v sau np li ni dung bng my np.
+B nh EEPROM: kt hp hai u im ca RAM v EPROM, loi
ny c th xoa v np bng tn hiu in. Tuy nhin s ln np
cng c gii hn.
4. u nhc im ca h thng:
Trong giai on u ca thi k pht trin cng nghip vo
khong 1960 - 1980, yu cu t ng ca h iu khin c
thc hin bng cc Rle in t ni vi nhau bng dy dn in
trong bng iu khin, trong nhiu trng hp bng iu khin
c kch thc qu ln n ni khng th gn ton b ln trn tng
v cc dy ni cng khng hon ton tt v th rt hay xy ra
trc trc trong h thng. Mt im quan trng na l do thi
gian lm vic ca cc Rle c gii hn nn khi cn thay th phingng ton b h thng v dy ni cng phit hay mi cho ph
hp, bng iu khin ch dng c mt yu cu ring bit khng
th thay i tc thi chc nng khc m i hi th chuyn mn
c tay ngh cao. Tm li h thng iu khin Rle hon ton
khng linh hot.
*Tm tc nh c im ca h thng iu khin dng Rle:
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-Tn km rt nhiu dy dn.
-Thay th rt phc tp.
-Cn cng nhn sa cha tay ngh cao.
-Cng sut tiu th ln.
-Thi gian sa cha lu.
-Kh cp nht s nn gy kh khn cho cng tc bo tr
cng nh thay th.
*u im ca h iu khin PLC:
S ra i ca h iu khin PLC lm thay i hn h
thng iu khin cng nh cc quan nim thit k v chng, hiu khin dng PLC c nhiu u im sau:
-Gim 80% s lng dy dn.
-Cng sut tiu th ca PLC rt thp.
-C chc nng t chun on do d dng cho cng tc sa
cha c nhanh chng v d dng.
-Chc nng iu khin thy i d dng bng thit b lp
trnh ( my tnh, mn hnh )
m khng cn thay i phn cng nu khng c yu cu thm
bt cc thit b xut nhp.
-S lng Rle v Timer t hn nhiu so vi h iu khin c
in.
-S lng tip im trong chng trnh s dng khng hn ch.
-Thi gian hon thnh mt chu chnh iu khin rtnhanh( vi mS) dn n tng cao tc sn xut.
-Chi ph lp t thp.
- tin cy cao.
-Chng trnh iu khin c th in ra giy ch trong vi pht
thun tin cho vn bo tr v sa cha h thng.
5. Phn loi PLC.
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Hin nay trong lnh vc iu khin ni chung v ngnh t
ng ha ni ring, cc PLC mi c a vo s dng ngy cng
nhiu vi tnh nng rt ln nh:
+ PLC S5
+ PLC S7 - 200
+ PLC S7 - 300
+ PLC S7 - 400
+ PLC LOGO
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II. H thng iu khin PLC S7 - 300.
II.1. Cu trc phn cng ca h thng PLC S7 - 300.
Thng thng, tng tnh mm do trong ng dng thc t
m phn ln cc i tng iu khin c s tn hiu u
vo/ra cng nh chng loi tn hiu vo /ra khc nhau m cc b
iu khin PLC c thit k khng b cng ha v cu hnh.
Chng c chia nh thnh cc modul. S cc modul c s dng
nhiu hay t tu theo yu cu cng ngh, song ti thiu bao gi
cng phi c mt modul chnh l cc modul CPU, cc modul chc
nng chuyn dng nh PID, iu khin ng c. Chng c gichung l modul m rng. Tt c cc modul c g trn nhng
thanh ray ( RACK).
* Modul CPU.
L modul c cha b vi x l, h iu hnh, b nh, cc b thi
gian, b m, cng truyn thng( chun truyn RS485) v c
th cn c mt vi cng vo /ra s ( Digital). Cc cng vo ra c
trn modul CPU c gi l cng vo ra ONBOART.
Modul CPU bao gm cc loi sau :
*CPU 312-IFM
-6ES7-312-5AC00-OABO
-6ES7-312-5AC01-OABO
-6ES7-312-5AC02-OABO
-6ES7-312-5AC81-OABO-6ES7-312-5AC82-OABO
+Cc module ny c:
-Vng nh lm vic :6KB
-Thi gian x l 1 khi lnh:0.6ms/KAW
-DI/DO trn module CPU:10/6
-S dng trong ni mng MPI
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*CPU 313
-6ES7 313-1AD00-0AB0
-6ES7 313-1AD01-0AB0
-6ES7 313-1AD02-0AB0
-6ES7 313-1AD03-0AB0
+Cc module ny c:
-Vng nh lm vic :12KB
-Thi gian x l 1 khi lnh:0.6ms/KAW
-S dng trong ni mng MPI
*CPU 314-6ES7 314-1AE01-0AB0
-6ES7 314-1AE02-0AB0
-6ES7 314-1AE03-0AB0
-6ES7 314-1AE04-0AB0
-6ES7 314-1AE83-0AB0
-6ES7 314-1AE84-0AB0
+Cc module ny c:
-Vng nh lm vic :24KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
-S dng trong ni mng MPI
*CPU 314 IFM
-6ES7 314-5AE00-0AB0
-6ES7 314-5AE01-0AB0-6ES7 314-5AE02-0AB0
-6ES7 314-5AE03-0AB0
-6ES7 314-5AE82-0AB0
-6ES7 314-5AE83-0AB0
+Cc module ny c:
-Vng nh lm vic :T 24KB n 32KB
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-Thi gian x l 1 khi lnh:0.3ms/KAW
-DI/DO trn module CPU:20/16
-Truyn thng kiu MPI
*CPU 315
-6ES7 315-1AF00-0AB0
-6ES7 315-1AF01-0AB0
-6ES7 315-1AF02-0AB0
-6ES7 315-1AF03-0AB0
+Cc module ny c:
-Vng nh lm vic :48KB-Thi gian x l 1 khi lnh:0.3ms/KAW
-S dng trong ni mng MPI
*CPU 315-2DP
-6ES7 315-2AF00-0AB0
-6ES7 315-2AF01-0AB0
-6ES7 315-2AF02-0AB0
-6ES7 315-2AF03-0AB0
-6ES7 315-2AF82-0AB0
-6ES7 315-2AF83-0AB0
+Cc module ny c:
-Vng nh lm vic :48KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
-Truyn thng kiu MPI,Profilbus-DP*CPU 316
-6ES7 316-1ag00-0ab0
+Cc module ny c:
-Vng nh lm vic :128KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
-S dng trong ni mng MPI
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*CPU 316-DP
-6ES7 316-2AG00-0AB0
+Cc module ny c:
-Vng nh lm vic :128KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
-Truyn thng kiu MPI,Profilbus-DP
*CPU 318-2
-6ES7 318-2AJ00-0ab0
+Cc module ny c:
-Vng nh lm vic :256KB-Thi gian x l 1 khi lnh:0.3ms/KAW
-S dng trong ni mng MPI
*CPU 614
-6ES7 614-1aH00-0ab3
-6ES7 614-1aH01-0ab3
-6ES7 614-1aH02-0ab3
-6ES7 614-1aH03-0ab3
+Cc module ny c:
-Vng nh lm vic :128KB n 192KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
-S dng trong ni mng MPI
*CPU 614
-6ES7 614-1AH00-0AB3-6ES7 614-1AH01-0AB3
-6ES7 614-1AH02-0AB3
-6ES7 614-1AH03-0AB3
+Cc module ny c:
-Vng nh lm vic :T 128KB n 192KB
-Thi gian x l 1 khi lnh:0.3ms/KAW
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-DI/DO trn module CPU:512KB
-Truyn thng kiu MPI
*CPU M7
+CPU 388-4
-6ES7-388-4BN00-0AC0
* Cc modul m rng.
Cc modul m rng c chia lm 5 loi chnh..
1. PS (Power supply) module ngun nui: c 3 loi 2A, 5A, 10A.
2. SM (Sigal module): Module m rng cng tn hiu vo/ra
gm:- DI (Digital Input): module m rng cng vo s c th l 8, 16
hoc 32 tu thuc vo tng loi module.
- DO (Digital Output): module m rng cng ra s.
- DI/DO: module m rng cng vo/ra s.
- AI (Analog Input):cng vo tng t, chng l nhng b
chuyn i tng t s 12 bits.
- AO (Analog Output) Module cng ra tng t, l nhng b
chuyn i tng t(DA).
- AI/AO: Module m rng cc cng vo/ra tng t.
3. IM (Interface Module) Module ghp ni:
L loi module chuyn dng c nhim v ni tng nhm cc
module m rng li vi nhau thnh mt khi v c qun ly chung
bi 1 module CPU.Thng thng cc module m rng c g lin nhau trn mt
thanh gi l Rack. Mi 1 Rack c th g c nhiu nht 8
module m rng (khng k module CPU, module ngun nui). Mt
module CPU S7-300 c th lm vic nhiu nht vi 4 Rack v cc
Rack ny phi c ni vi nhau bng module IM.
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4. FM (Function Module) :Module c chc nng iu khin
ring: VD module ng c bc, module PID.
5. CP (Commuication Module):Module phc v truyn thng
trong mng gia cc PLC vi nhau hoc gia PLC vi my tnh.
S kt ni trm PLC S7 - 300
II.2 X l cc tn hiu vo ra, cu trc b nh trong PLC.
Cc tn hiu vo ra t u vo ra ca PLC s c lu tr trongcc vng nh. x l cc tn hiu ny ta truy nhp vo vng a
ch ly cc gi tr ca chng. Sau y s trnh by cu trc
b nh v cc truy nhp cho PLC Siemens.
* Phng php truy nhp.
PLC lu tr thng tin trong b nh. B nh ca PLC c chia lm
nhiu vng (I, Q, M, T, C,.) mi vng nh u c a ch xc
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nh. Ta c th truy nhp (ghi hoc c thng tin) vo cc nh
trong cc vng bng a ch ca chng. C 2 cch truy nhp theo
ting bit hoc truy nhp theo byte.
+Truy nhp theo tng bit: truy nhp theo tng bit ta phi
nh a ch bao gm: a ch vng nh, a ch byte, a
ch bit (ngn cch gia a ch byte v a ch bit l du .
MSB LSB01234567
I0I1I2I3I4I5I6I7
MSB: Most Significant BitMSB: Lcast Significant Bit
Vd: I 3.4S th t Bit trong byte: bit th 5 (0 n 7)Ng n c ch gia a chbyte v a chbit
a chbyte: byte 3 ( byte th 4)Tn v ng nh : I = v ng nh vo
Nh vy thng tin ca u vo I3.4 s c lu tr trong nh ca ch I3.4 . Truy nhp vo nh ny s bit c thng tin u
vo I3.4.
+Truy nhp theo byte: Ta c th truy nhp cc vng nh theo
byte, Word (2 byte), Double Word (4 byte). truy nhp theo cc
phng php ny ta phi nh a ch bao gm: a ch vng nh
(V, I, Q, M, SM, T, C, HC)
II.3 Ngun nui v ng ra ca PLC S7-300.
- Ngun nui: l n v dng chuyn i ngun AC
thnh ngun DC (5V, 24V) cung cp cho CPU v cc khi vo
ra.
-Ng ra: Plac S7-300 c ng ra l cc phn t hot ng tng
thch vi cc loi tn hiu vo nh Role, cc van iu khin.
II.4 Cc h m v cc kiu d liu.GVHD: nguyen dinh khanh SV:giap van thuy
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4.1. Cc h m:
Chng ta s dng rt nhiu h m, quen dng nht vn l h
thp phn (h m c s 10). Tuy nhin ngoi h thp phn
cn c rt nhiu cc h m khc:
- H nh phn: l h m c s 2, s dng 2 con s 0 v 1
biu din gi tr.
- H bt phn: l h m c s 8, s dng 8 con s
0,1,2,3,4,5,6,7 biu din cc gi tr.
- H thp phn: l h m c s 10 dng cc con s
0,1,2,3,4,5,6,7,8,9 biu din cc gi tr.- H thp lc phn: l h m c s 16 s dng 16 con s
0..F biu din cc gi tr.
4.2. Cc kiu d liu.
PLC lu tr cc d liu trong cc b nh, cc d liu ny c th
c lu tr nhiu dng khc nhau:
- BOOL: vi dung lng l 1bit v c gi tr l 0 hoc 1, y l
kiu d liu bin c 2 gi tr.
- BYTE: gm 8 bits, thng c dng biu din 1 s nguyn
dng trong khong 0.255 hoc m ASCII ca 1 k t.
- WORD: gm 2 bytes biu din s nguyn dng t 0
65535.
- DWORD: l t kp c gi tr l 0.232-1.
- INT: cng c dung lng 2 bytes, dng biu din 1 snguyn trong khong -32768..+32767 (2-15.215-1).
- REAL: c dung lng l 4 bytes dng biu din 1 s thc
trong khong
-3,4E38..3,4E38.
III. Cu trc b nh ca CPU ca PLC S7 - 300.
c chia ra lm 3 vng chnh:
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1) Vng cha chng trnh ng dng: vng nh chng trnh c
chia lm 3 min:
+ OB: Min cha chng trnh t chc.
+ FC: ( Funktion ) Min cha chng trnh con c t chc
thnh hm c bin hnh thc trao i d liu vi chng
trnh gi n.
+ FB: ( Funktion Block) Min cha chng trnh con,c t
chc thnh hm v c kh nng trao i d liu vi bt c mt
khi chng trnh no khc. Cc d li phi c xy dng thnh
mt khi d liu ring ( gi l DB - Data block).2) Vng cha cc tham s ca h iu hnh v chng trnh
ng dng, c chia thnh 7 min khc nhau, bao gm:
I ( Procees image input): Min b m cc d liu cng vo
s. Trc khi thc hin chng trnh, PLC s c gi tr logic ca tt
c cc u vo v ct gi chng vo vng nh I. Thng thng ch-
ng trnh ng dng khng c trc tip trng thi logic ca cng
vo m ch ly d liu ca cng vo t b m I.
Q ( Procees image output): Min b m cc cng ra s. Kt
thc giai on thc hin chng trnh chuyn gi tr ca b m
ti cng ra s. Thng thng khng trc tip gn gi tr ti tn
cng ra m ch chuyn chng vo b nh Q.
M: Min cc bin c. Chng trnh ng dng s dng vng nh
ny lu gi cc tham s cn thit v c th truy cp n theoBit (M), Byte(MB) , t (MW) hay t kp(MD).
T: Min nh ph v b thi gian(TIME) bao gm vic lu gi gi
tr thi gian dt trc ( PV - Preset Value), gi tr m thi gian
tc thi ( CV - Curren Value) cng nh cc gi tr logic u ra ca
b thi gian.
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C: Min nh phc v b m ( Counter) bao gm vic lu gi gi
tr t trc (PV), v gi tr m tc thi (CV) v gi tr logic u
ra ca b m.
PI: Min a ch cng vo ca cc modul tng t. Cc gi tr
tng t ti cng vo ca modul tng t s c c v chuyn t
ng theo nhng a ch. Chng trnh ng dng c th truy
nhp min nh PI theo tong byte (PIB), tng t (PIW) hoc theo t
kp (PID).
PQ: Min a ch cng ra cho cc modul tng t. Cc gi tr
theo nhng a ch ny c modul tng t chuyn ti cc cngra tng t. Chng trnh ng dng c th truy cp min PQ theo
tng byte (PQB), tng t (PQW) hoc theo t kp (PQD).
3) Vng cha cc khi d liu: c chia lm hai loi
DB (Data Block): Min cha cc d liu c t chc thnh khi.
Kch thc cng nh khi lng do ngi s dng quy nh, ph hp vi
tng bi ton iu khin. Chng trnh ng dng c th truy cp
min nh ny theo tng bit, byte, tng t hoc t kp.
L (Local data block): Min d liu a phng, c cc khi ch-
ng trnh OB, FB, FC t chc v s dng cho cc bin nhp tc
thi v trao i d liu ca cc bin hnh thc ca chng trnh
vi cc khi chng trnh gi n. Ni dung ca mt s d liu
trong min nh ny s b xoa khi kt thc chng trnh tng ng
trong OB, FB, FC. Min ny c th truy cp theo tng bt (L), byte(LB), t (LW), t kp (LD).
IV. Vng qut ca chng trnh.
SPS (PLC) thc hin cc cng vic (bao gm c chng trnh
iu khin) theo chu trnh lp. Mi vng lp c gi l mt
vng qut (scancycle). Mi vng qut u bt u bng vic
chuyn d liu t cc cng vo s ti vng b m o I, tip theo
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l giai on thc hin chng trnh. Trong tng vng qut, chng
trnh thc hin t lnh u tin n lnh kt thc ca khi
OB1. sau giai on thc hin chng trnh l giai on chuyn
ni dung ca b m o Q ti cc cng ra s. Vng qut c kt
thc bng giai on x l cc yu cu truyn thng ( nu c) v
kin tra trng thi ca CPU. Mi vng qut c th c m t nh
sau:
Truyn d liu t cngvo t i I
Thc hin ch-ngtrnh
Chuyn d liu tQ ra cng
Truyn thng v
kin tra ni b
Vng qut
Qu trnh hot ng ca mt vng qut
Ch : B m I v Q khng lin quan ti cc cng vo ra tngt nn cc lnh truy nhp cng tng t c thc hin trc tip vi
cng vt l ch khng thng qua b m.
Thi gian cn thit PLC thc hin mt vng qut c gi l
thi gian vng qut (Scan time). Thi gian vng qut khng c
nh, tc l khng phi vng qut no cng thc hin trong mt
khong thi gian nh nhau. C vng qut thc hin lu, c vng
qut thc hin nhanh tu thuc vo s cu lnh trong chng
trnh c thc hin, vo khi d liu truyn thng trong vng
qut .
Nh vy gia vic c d liu t i tng cn x l, tnh ton
v vic gi thng tiniu khin n i tng c mt khong thi
gian bng thi gian mt vng qut. Ni cch khc, thi gian vng
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trong PLC. Thi gian vng qut cng ngn, tnh thi gian thc
ca chng trnh cng cao.
Nu s dng cc khi chng trnh c bit c ch ngt,
v d khi OB40, OB80.Chng trnh ca cc khi s c
thc hin trong vng qut khi xut tn hiu bo ngt cng chng
loi. Cc khi chng trnh ny c th thc hin ti mi vng qut
ch khng b g p l phi trong giai on chng trnh.
Chng hn mt tn hiu bo ngt xut hin khi PLC ang giai
on truyn thng v kin tra ni b, PLC s tm dng cng vic
truyn thng, kin tra, thc hin ngt nh vy, thi gian vngqut s cng ln khi cng c nhiu tn hiu ngt xut hin trong
vng qut. Do nng cao tnh thi gian thc cho chng
trnh iu khin, tuyt i khng nn vit chng trnh x l
ngt qu nhiu hoc s dng qu lm dng ch ngt trong
chng trnh iu khin.
Ti thi im thc hin lnh vo ra, thng thng lnh khng
lm vic trc tip vi cng ra vo m ch thng qua b nh m
ca cng trong vng nh tham s. Vic truyn thng gia cc b
m o vi ngoi vi trong giai on 1 v 3 do h iu hnh CPU
qun l, mt s modul CPU, khi gp lnh vo /ra ngay lp tc
h thng s cho dng mi cng vic khc, ngay c chng trnh x
l ngt thc hin vi cng vo /ra.
V. Nhng khi OB c bit.Khi OB1 c chc nng qun l chnh trong ton b chng
trnh, c ngha l n s thc hin mt cch u n tng
vng qut khi thc hin chng trnh. Ngoi ra Step7 cn c
nhiu khi OB1 c bit khc v mi khi OB c mt nhim
v khc nhau, v d cc khi OB cha cc chng trnh ngt ca
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chng trnh bo li.Tu thuc vo CPU khc nhau m c cc
khi OB khc nhau. v d khi OB c bit.
OB10 (Time of Day Interrupt): Chng trnh trong khi OB10 s
c thc hin khi gi tr ca ng h thi gian thc nm trong
mt khong thi gian quy nh. OB10 c th c gi mt ln,
nhiu ln cch u nhau tng pht, tng gi, tng ngy.Vic
quy nh thi gian hay s ln gi OB10 c thc hin bng ch-
ng trnh h thng SFC28 hoc trong bng tham s modul CPU
nh phn mm Step7.
OB20 (Time Delay Interrupt): Chng trnh trong khi OB20 sc thc hin sau mt khong thi gian ch t trc k t khi gi
chng trnh h thng SFC32 t thi gian ch.
OB35 (Cyclic Interrupt): Chng trnh OB35 s c thc hin
cch u nhau mt khong thi gian c nh. Mc d khong
thi gian ny l 100ms, xong ta c th thay i trong bng t
tham s cho CPU nh phn mm Step7.
OB40 (Hardware Interrupt): Chng trnh trong khi OB40 s -
c thc hin khi xut hin mt tn hiu bo ngt t ngoi vi a
vo CPU thng qua cc cng vo/ra s onboard c bit hoc
thng qua cc modul SM, CP, FM.
OB80 (Cycle Time Fault): Chng trnh s c thc hinkhi thi
gian vng qut (Scan time) vt qua thi gian cc i quy nh
hoc khi c tn hiu ngt gi mt khi OB no m khi OBny cha kt thc ln gi trc. Mc nh, Scan time cc i l
150ms nhng c th thay i tham s nh phn mm Step7.
OB81 (Power Supply Fault): Nu c li v phn ngun cung cp
th gi chng trnh trong khi OB81.
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OB82 (Diagnostic Interrput) : Chng trnh trong khi ny s c
gi khi CPU pht hin c li cc modul vo/ra m rng. Vi iu
kin cc modul vo /ra ny phi c chc nng t kim tra mnh.
OB85 ( Not Load Fault): CPU s gi khi OB85 kh pht hin khi
chng trnh ng dng c s dng ch ngt nhng chng
trnh x l ngt li khng c trong khi OB tng ng.
OB87 (Communication Fault): Chng trnh trong khi ny s -
c gi khi CPU thy c li trong truyn thng.
OB100 (Start Up Information): Khi ny s c thc hin mt
ln khi CPU chuyn trng thi t STOP sang trng thi RUN.OB121 (Synchronouns error): Khi ny s c gi khi CPU pht
hin thy li logic trong chng trnh nh i sai kiu d liu
hoc li truy nhp khi DB, FC, FB khng c trong b nh CPU.
OB122 (Synchronouns error): Khi ny s c thc hin khi CPU
pht hin thy li truy cp modul trong chng trnh, v d trong
chng trnh c lnh truy nhp modul m rng nhng li khng c
modul ny.
VI. Thanh ghi trng thi.
Khi thc hin lnh, CPU s ghi li trng thi ca php tnh trung
gian cng nh kt qu vo 1 thanh ghi c bit 16 bits, c gi l
thanh ghi trng thi (Status Word). Mc d thanh ghi trng thi ny
c di 16 bits nhng ch s dng 9 bits vi cu trc nh sau:BR CC1 CC0 OV OS OR STA RLO FC
- FC (First Check): Khi phi thc hin 1 dy cc lnh logic lin
tip nhau gm cc lnh v, hoc v nghch o, bits FC c
gi tr bng 1. Ni cch khc, FC = 0 khi dy cc lnh logic lin tip
va c kt thc. V d:
A I0.3 // FC = 1GVHD: nguyen dinh khanh SV:giap van thuy
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AN I0.3 // FC = 1
= Q4.0 // FC = 0
- RLO (Result of Logic Operation): Kt qu tc thi ca php
tnh logic va c thc hin. V d lnh
A I0.3
+ Nu trc khi thc hin bits FC = 0 th c tc ng chuyn
i ni dung ca cng vo I0.3 vo bt trng thi RLO.
+ Nu trc khi thc hin bits FC = 1 th c tc dng thc
hin php tnh AND gia RLO v gi tr logic cng vo I0.3. Ktqu ca php tnh c ghi li vo bits trng thi RLO.
- STA (Status bits): Bits trng thi lun c gi tr logic ca tip
im ch nh trong lnh. V d c hai lnh
A I0.3
AN I0.3
u c gn cho bits STA cng mt gi tr l ni dung ca
cng vo s I0.3
- OR: Ghi li gi tr ca php tnh logic AND cui cng c thc
hin ph gip cho vic thc hin php ton OR sau . iu
ny l cn thit v trong biu thc hm gi tr, php tnh AND
bao gi cng c thc hin trc cc php tnh OR.
- OS (Stored overflow bit): Ghi li gi tr bt php tnh trn ra
ngoi mng nh.- OV (Overflow bit): Bit bo kt qu php tnh b trn ra ngoi
mng nh.
- CC0 v CC1 (Condition code): Hai bit bo trng thi kt qu
php tnh vi s nguyn, s thc, php chuyn dch hoc php
tnh logic trong ACCU. C th l:
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* Khi thc hin lnh ton hc nh cng, tr, nhn, chia vi s
nguyn hoc s thc.
CC1 CC0 ngha0 0 Kt qu bng 0 (=0)0 1 Kt qu nh hn 0 (0)
* Khi thc hin lnh ton hc vi s nguyn nhng kt qu b
trn nh.
CC1 CC0 ngha0 0 Kt qu qu nh khi
thc hin lnh cng
(+I, +D)0 1 Kt qu qu nh khi
thc hin lnh nhn
(*I, *D) hoc qu ln khi
thc hin lnh cng tr
(+I, +D, -I, -D).1 0 Kt qu qu ln khi thc
hin lnh nhn, chia
(*I, *D, /I, /D) hoc qu
nh khi thc hin lnh
cng tr (+I, +D, -I, -D).1 1 Kt qu b trn do thc
hin lnh chia cho 0 (/I,
/D).
* Khi thc hin lnh ton hc vi s thc nhng kt qu b trn
nh
CC1 CC0 ngha0 0 Kt qu c s m e qu
ln0 1 Kt qu c mantissa
qu nhGVHD: nguyen dinh khanh SV:giap van thuy
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1 0 Kt qu c mantissa
qu ln1 1 Php tnh sai quy
chun* Khi thc hin lnh chuyn dch:
CC1 CC0 ngha0 0 Gi tr ca bit b y
ra bng 01 0 Gi tr ca bit b y
ra bng 1
* Khi thc hin lnh logic trong ACCU:
CC1 CC0 ngha0 0 Kt qu bng 0 (=0)1 0 Kt qu khc 0 (#0)
- BR (Binary result bit): Bit tng thi cho php lin kt hai loi
ngn ng lp trnh STL v LAD. Chng hn cho php ngi s dng
c th vit mt khi chng trnh FB hoc FC trn STL nhng giv s dng chng trong mt chng trnh khc trn LAD. to ra
c mi lin kt , ta cn phi kt thc chng trnh trong FB,
FC bng bng ghi
+ 1 vo BR, nu chng trnh chy khng c li.
+ 0 vo BR, nu chng trnh chy c li.
Khi s dng cc hm c bit ca h thng (STL hoc
LAD), trng thi lm vic ca chng trnh cng c thng bo ra
ngoi qua bit trng thi BR nh sau
+1, nu SFC hay SFB thc hin khng c li.
+0, nu c li khi thc hin SFC hay SFB.
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Chng III k thut lp trnh PLC s7 - 300
I. Gii thiu chung.
I.1. Lp trnh tuyn tnh v lp trnh c cu trc.
B nh ca CPU dnh cho chng trnh ng dng c tn gi l
logic block. Nh vy logic block l tn chung gi tt c cc khi
chng trnh bao gm: khi chng trnh t chc OB, khi chng
trnh FC, khi hm FB.trong cc khi chng trnh ch c duy
ngt khi OB1 c thc hin trc tip theo vng qut. N c h
iu hnh gi theo chu k lp vi khong thi gian khng cchu nhau m ph thuc vo di ca chng trnh. Cc loi
khi chng trnh khc khng tham gia vo vng qut.
Vi hnh thc t chc nh vy th phn chng trnh trong khi
OB1 c y iu kin ca mt chng trnh, iu kin thi
gian thc v ton b chng trnh ng dng c th ch cn vit
trong OB1 l . Cch vit t chc chng trnh vi ch mt khi
OB1 duy nht nh vy gi l lp trnh tuyn tnh (LinearProgramming)
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S khi kiu lp trnh tuyn tnh
Khi OB1 c h thng gi xoay lin tc theo vng qut.
Cc khi OB khc khng tham gia vo vng qut c gi bng
cc tn hiu ngt. S7 - 300 c nhiu tn hiu bo ngt nh tn
hiu bo ngt khi c s c ngun nui, c s c chp mch cc
modul m rng, tn hiu bo ngt theo chu k thi gian, v mitn hiu ngt nh vy cng ch c kh nng gi mt khi OB nht
nh. V d s c bo ngt ngun nui ch gi khi OB81, tn
hiu bo ngt truyn thng ch gi khi OB87.
Mi tn hiu bo ngt h thng s dng cng vic ang thc
hin li, chng hn tm dng cng vic trn khi OB1 v thc hin
chuyn sang thc hin chng trnh x l ngt trong cc khi OB
tng ng. V d khi ang thc hin chng trnh trn khi OB1m xut hin bo s c truyn thng, h thng s tm dng thc
hin trn OB1 li gi chng trnh truyn thng khi OB87.
Ch khi no thc hin xong chng trnh trn khi OB87 th h
thng quay tr li thc hin tip chng trnh OB1.
Lp trnh c cu trc: Chng trnh c chia thnh nhiu phn
nh vi tng nhim v ring v cc phn ny nm trong nhng
GVHD: nguyen dinh khanh SV:giap van thuy
OB1thchintheovngqut
OB10 Ngt thi im
nh trc
OB82 Modulchun on li
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khi chng trnh khc nhau. Loi hnh cu trc ny ph hp vi
nhiu bi ton iu khin nhiu nhim v v phc tp, li rt
thun li cho vic sa cha sau ny.
DB
DB
DB DB
S kiu lp trnh c cu trc.
I.2 Quy trnh thit k h iu khin PLC v cc phn t
lgic c bn.
1. Quy trnh thit k h thng iu khin dng PLC
bao gm cc bc sau:
a. Xc nh quy trnh iu khin.
iu u tin cn bit l i tng iu khin ca h thng,
mc ch chnh ca PLC l phi iu khin c cc thit b
ngoi vi. Cc chuyn ng ca i tng iu khin c kim tra
thng xuyn bi cc thit b vo, cc thit b ny gi tn hiu
vo PLC v tip PLC s a tn hiu iu khin n cc thitb iu khin chuyn ng ca i tng.
b. Xc nh tn hiu vo ra.
Bc th 2 l phi xc nh v tr kt ni gia cc thit b vo
ra vi PLC. Thit b vo c th l tip im, cm bin.Thit b
ra c th l rle in t, mt, nMi v tr kt ni c nh
s tng t ng vi PLC s dng
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OB
FB FC SFB
FB FB SFC
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c. Son tho ch ng trnh.
Chng trnh iu khin c son tho di dng lu hnh
thang.
d. Np ch ng trnh vo b nh.
Cp ngun cho PLC, ci t cu hnh khi giao tip I/O nu
cn. Sau np chng trnh son tho trn mn hnh vo b nh
ca PLC. Sau khi hon tt nn kin tra li bng chc nng chun
on v nu c th th chy chng trnh m phng ca h
thng.
e. Chy ch ng trnh.Trc khi khi ng h thng cn phi chc chn dy ni t
PLC n cc thit b ngoi vi l ng. Trong qu trnh chy kin
tra c th cn thit thc hin cc bc chnh h thng nhm m
bo an ton khi a vo hot ng thc t.
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Sa cha ch-ng trinh
Chm dt
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Xc nh yucu ca h
Lit k cc thitb I/O tng ngvi cc u I/O
Np chngtrnh vo
Son tho ch-ng trnh
Chy m phngv tm li
Kim
Chy thchng
Kt ni ccthit b I/O vo
Np voEPROM
To ti li uchng
Chy tt
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Quy trnh thit k mt h iu khin t ng
II. Ngn ng lp trnh cho PLC S7 - 300.
vit chng trnh iu khin trn PLC c 3 phng php c
bn l:
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Sa chachng trinh
Chm dt
V lu iu khin
Chytt
Kim trady ni
YESNO
NO
YES
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-S hnh thang LAD (Ladderr Diagram).
-Lu h thng iu khin FBD (Function Block Diagram).
-Lit k lnh STL (Statement List).
Mt chng trnh vit trn LAD hoc FBD c th chuyn sang
STL, nhng khng xy ra ngc li v trong STL c nhiu lnh khng
c trong LAD hay FBD.
1. Ph ng php lp trnh bng LAD.
Phng php ny c cch biu din chng trnh tng t nh s
tip im dng Rle trong s in cng nghip.VD:
S iu khin ni cng dng Rle c biu din bng ph-ng php LAD.:
2. Ph ng php lp trnh bng FBD.
Phng php ny c cch biu din di dng lin kt ca cc hm
lgic k thut s, loi ngn ng ny thch hp cho nhng ngiquen s dng v thit k mch iu khin s. VD:
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3. Phng php lp trnh theo ngn ng STL.
Phng php ny l ngn ng lp trnh theo kiu lit k cc
cu lnh thnh tp hp lnh, mi lnh thc hin mt chc nng.
Tng t vi ngn ng Assembler my tnh, phng php ny
thch hp vi nhng i tng lm vic trong lnh vc tin hc. VD:
III. Lp trnh v chn ch lm vic cho PLC S7-300.
1.Gii thiu chung.
Lp trnh c ngha l nhp mt mch vo trong phn mm
ca PLC S7-300. y thc ra l cch biu din khc ca s
mch. Chng ta vit chng trnh trn phn mm son tho
Simentic S7 mt cch ngn gn v ph hp nht.
Trn phn mm son tho ny, s mch iu khin c thc vit theo cc ngn ng khc nhau nh bng ngn ng LAD,
FBD, STLv mt im cn lu l vi Simentic S7-300 ta thng
son tho chng trnh trn khi OB1.
2. Lp trnh trn Simentic S7-300.
2.1.Chn giao din cho PLC.
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Mun chn giao din no, ta nh du b giao din pha
tri ri n phm Install B giao din c chn s c ghi vo
bn phi. Sau khi chn xong b giao din s dng, ta cn phi ci
t tham s lm vic cho b giao din bao gm tc truyn,
cng ghp ni my tnh..
2.2. Khai bo v m mt ProJect mi.
T giao din ca PLC chn File -> New hoc kch chut vo
biu tng New Project/Library
Khai bo mt Projest mi
Ni m mt Project c
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Khi trn mn hnh s xut hin hp thoi, g tn Project ri
n phm OK v nh vy ta khai bo xong mt Projeck mi. Ta
cng c th chn ni ct Project mi, mc nh ni ct l th mc
C:\siemens\step7\S7 Proj.
N i vit tn mt Project
Sau khi khai bo xong mt Project mi th trn mn hnh xut
hin Project nhng dng rng (cha c g), nh hnh v:
Biu tng
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mt th mc rng
Trong trng hp mun m mt Project mi ta chn File -> Open,
hoc kch chut vo biu tng Open Project/Library ri chn tn
mun m sau n phm OK.
Tn mt Project c sn
2.3. Son tho ch ng trnh trn khi OB1.
Ta nhy chut vo biu tng ca khi OB1 ca s bn phi.
nh hnh v:
Biu tng khi OB1
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Khi y trn mn hnh s xut hin ca s, ta vit chng trnh
iu khin trn ca s ny. VD:Ta c th vit chng trnh bng nhiu th ngn ng khc
nhau trn ca s son tho ny nh ngn ng LAD, PBD. STL.
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Khi lp trnh xong c th chy th chng trnh bng cch: vo
biu tng Simulation -> Download -> chn s lng u vo v s
lng u ra -> Run_p -> quay li mn hnh son tho kch vo
biu tng Monitor.
IV. Cc khi, hm v chc nng ca n trong PLC.
1. Cc hm lgic tip im.- Hm AND: tn hiu ra bng 1 khi tt c cc tn hiu vo
bng 1.
FBD LAD STL
- Hm OR: Tiu ra bng 1 khi mt trong cc tn hiu vo bng
1.
FBD LAD STL
- Hm NOT: Tn hiu ra l o ca tn hiu vo:
FBD LAD STL
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- Hm XOR: tn hiu ra bng 1 khi hai tin hiu vo khc nhau:
FBD LAD STL
-Lnh xo RESET: Tn hiu ra b xo khi co tn hiu vo.
- Lnh SET: Tn hiu ra bng 1 khi c tn hiu vo (tn hiu
ny c lu gi c khi khng c tn hiu vo):
FBD LAD STL
GVHD: nguyen dinh khanh SV:giap van thuy
FBD LAD STL
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- Lnh POSITIVE: Cho mt xung c rng bng mt vng
qut ti thi im c sn ln ca xung u vo:
FBD LAD STL
- Lnh NEGAITIVE: Cho mt xung c rng bng mt vng
qut ti thi im c sn xung ca xung u vo:
B nh RS: u ra bng 1 khi u S bng 1, u ra bng 0 khi
u R bng 1, nu R v S u bng 1 th u ra bng 1(u tin
SET):
GVHD: nguyen dinh khanh SV:giap van thuy
FBD LAD STL
FBD LAD STL
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+ Hm so snh ln hn hoc bng nhau gia hai s thc 32
bt:
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Khi tn hiu vo I0.0 = 1 u ra Q0.0 = 1 v hm s thc hin
tr hai s nguyn 16 bt MW0 vi MW2. Kt qu c ct vo
MW10. Trng hp tn hiu vo I0.0 u ra Q0.0 v hm s khng
c thc hin chc nng ny.
3. Nhn hai s nguyn 16 bt:
FBD LAD STL
D liu vo v ra:
EN: BOOL IN1: INT
IN2: INT OUT: INT EN0: BOOL
Khi tn hiu vo I0.0 = 1 u ra Q0.0 = 1 v hm s thc hinnhn hai s nguyn 16 bt MW0 vi MW2. Kt qu c ct vo
MW10. Trng hp tn hiu vo I0.0 u ra Q0.0 v hm s khng
c thc hin chc nng ny.
4. Chia hai s nguyn 16 bt:
FBD LAD STL
D liu vo v ra:
EN: BOOL IN1: INTGVHD: nguyen dinh khanh SV:giap van thuy
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IN2: INT OUT: INT EN0: BOOL
Khi tn hiu vo I0.0 = 1 u ra Q0.0 = 1 v hm s thc hin
chia hai s nguyn 16 bt MW0 vi MW2. Kt qu c ct vo
MW10. Trng hp tn hiu vo I0.0 u ra Q0.0 v hm s khng
c thc hin chc nng ny.
4. Nhm hm i kiu d liu.
Trong ngn ng lp trnh ca S7- 300 c mt kiu d liu
khc nhau nh:
-S nguyn 16 bt (Interger)
-S nguyn 32 bt (DI)-S nguyn dng BCD
- V cc dng cc d liu khc.
Khi lm vic vi nhiu dng d liu khc nhau cho ta cn phi
chuyn i chng. V d khi c tn hiu t cng vo tng t
ta nhn c s liu dng s nguyn 16 bt mang gi tr tn hiu t-
ng t ch khng phi gi tr bn thn , bi vy phi x l
tip th cn phi chuyn i s nguyn thnh ng gi tr
thc, du phy ng ca tn hiu cng. Ta c mt s hm
chuyn i cc dng d liu nh sau:
a. Hm chuyn s BCD thnh s nguyn 16 bt:
FBD LAD STL
D liu vo v ra:
EN: BOOL IN: WORD
OUT: INT ENO: BOOLGVHD: nguyen dinh khanh SV:giap van thuy
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Khi tn hiu vo I0.0 = 1 u ra Q0.0 = 1 v hm thc hin
chc nng chuyn s BCD (MW10) sang s nguyn ri ct vo
MW12. Khi tn hiu vo I0.0 = 0 vo u ra Q0.0 = 0 v hm
khng thc hin chc nng chuyn i.
b. Hm chuyn s nguyn 16 bt thnh s BCD:
FBD LAD STL
D liu vo v ra:
EN: BOOL IN: WORD
OUT: INT ENO: BOOL
Khi tn hiu vo I0.0 = 1 u ra Q0.0 = 1 v hm thc hin
chc nng chuyn s nguyn (MW10) sang s BCD ri ct voMW12. Khi tn hiu vo I0.0 = 0 vo u ra Q0.0 = 0 v hm
khng thc hin chc nng chuyn i.
5. Cc hm i du.
Hm s thc hin chc nng i du d liu vo. Cc hm
i du nh i du s thc 16 bt, 32 bt, hay s nguyn (R).
FBD LAD STL
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NEG_I NEG_DI NEG_REN BOOL BOOL BOOLIN INT DI REALOUT INT DI REALENO BOOL BOOL BOOL
6. Cc hm thc hin chc nng lm trn (i liu d
liu):
FBD LAD STL
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
xo tc thi trng thi ca T- Word v T- bit ngi ta s dng
mt tn hiu Reset Timer. Ti thi im sn ln ca tn hiu ny
gi tr T- Word v T- bit ng thi gi tr bng 0 tc l thanh ghi
tc thi CV c t v 0 v tn hiu u ra cng trng thi
logic 0. Trong thi gian tn hiu Reset c gi t logic l 1 Timer s
khng lm vic.
2. Khai bo s dng.
Cc tn hiu iu khin cho b Timer phi c khai bo theo
cc bc sau y:
- Khai bo tn hiu ENABLE nu mun tn hiu ch ng kch.- Khai bo tn hiu u vo U(t)
- Khai bo thi gian tr mong mun TW.
- Khai bo loi Timer c s dng (SP,SE, SD, SS, SF)
- Khai bo tn hiu xa Timer nu mun s dng ch Reset
ch ng.
Trong cc bc trn th bc 1 v 5 c th b qua.
- Dng d liu vo ra ca b Timer:
S: BOOL BI (DUAL): WORD
TW: S5TIME BCD(DEZ): WORD
R: BOOL Q:BOOL
- B thi gian SP: Ti thi im sn ln ca tn hiu vo SET
thi gian s c tnh, ng thi gi tr lgic u ra l 1. Khi thi
gian t kt thc gi tr u ra tr v 0:
FBD LAD STL
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
Gin thi gian
Tn hiu S
Tn hiu R
Thi gian t
u ra
u ra o
Khi c tn hiu RESET (R) thi gian tnh lp tc tr v 0 v tn
hiu u ra cng bng c gi tr 0.- B thi gian SE:Ti thi im sn ln ca tn hiu vo SET
cui cng b thi gian c thit lp v thi gian s c tnh ng
thi gi tr u ra l 1. Kt thc thi gian t th u ra bng
0. Khi c tn hiu RESET (R) thi gian tnh lp tc tr v 0 v tn
hiu u ra cng bng c gi tr 0.
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FBD LAD STL
Gin thi gian:
Tn hiu S
Tn hiu R
Thi gian t
u ra
u ra o
- B thi gian SD: Ti thi im sn ln ca tn hiu vo SET
b thi gian c thit lp v thi gian s c tnh. Kt thc thi
gian t tn hiu u ra s c gi tr l 1. Khi S l 0 u ra cng
lp tc tr v 0, ngha l tn hiu u ra s khng c duy tr khi
tn hiu kch c gi tr l 0.
FBD LAD STL
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
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Gin thi gian:
Tn hiu S
Tn hiu R
Thi gian t
u ra
u ra o
- B thi gian SS:Ti thi im sn ln ca tn hiu vo SET
b thi gian oc thit lp v thi gian s c tnh. Kt thc thi
gian t tn hiu u ra s c gi tr 1, gi tr ny vn c duy
tr ngay c khi tn hiu vo kch S bng 0. Khi c tn hiu RESET
thi gian lp tc tr v 0 u ra cng bng 0.
Gin thi gian:
GVHD: nguyen dinh khanh SV:giap van thuy
FBD LAD STL
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
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Tn hiu S
Tn hiu R
Thi gian t
u ra
u ra o- B thi gian SF: Ti thi im sn ln ca tn hiu vo SET
b thi gian c thit lp. u ra c gi tr bng1. Nhng thi gian
s c tnh thi im sn xung cui cng ca tn hiu u
vo S. Kt thc thi gian t th u ra bng 0:
FBD LAD STL
Gin thi gian:
Tn hiu S
Tn hiu R
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
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Thi gian t
u ra
u ra o
VII. B m COUNTER.
Counter thc hin chc nng m ti cc sn ca cc xung
u vo. S7-300 c ti a l 256 b m ph thuc vo tng loiCPU, k hiu Cx. Trong x l s nguyn trong khong t 0 n
255. Trong S7-300 c 3 loi b m thng s dng nht l :
B m tin(CU), B m li(CD), B m tim li(CUD).
CU: BOOL l tn hiu m tin
CD: BOOL l tn hiu m li
S: BOOL l tn hiu t
PV: WORD l gi tr t trc
R: BOOL l tn hiu xo
CV: WORD l gi tr m h m 16
CV_BCD: WORD l gi tr m h m BCD
Q: BOOL l tn hiu u ra
- B m tin CU:
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n tt nghip
Nguyn l lm vic: Khi tn hiu I0.2 chuyn t 0 ln 1 b m
c t gi tr l 55. Gi tr u ra Q4.0 =1.
B m s thc hin m tin ti cc sn ln ca tn hiu ti
chn CU khi tn hiu I0.0 chuyn gi tr t 0 ln 1. Gi tr b
m tr v 0 khi c tn hiu ti sn ln ca chn R.
FBD LAD STL
- B m li CD:
Nguyn l hot ng: Khi tn hiu I0.2chuyn t 0 ln 1 b
m c t gi tr l 55. Gi tr u ra Q4.0 = 1B m s thc hin m li ti cc sn ln ca tn hiu ti
chn CD, khi tn hiu I0.0 chuyn gi tr t 0 ln 1. Gi tr ca b
m s tr v 0 khi c tn hiu ti sn ln ca chn R. B m s
ch m n gi tr >=0.
S khi:
FBD LAD STL
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- B m tin li.
Nguyn l hot ng: Khi tn hiu I0.2 chuyn t 0 ln 1 b
m c t gi tr l 55.Gi tr u ra Q4.0 = 1
B m thc hin m tin ti cc sn ln ca tn hiu ti
chn CU khi tn hiu I0.0chuyn gi tr t 0 ln 1.B m s m li ti cc sn ln ca tn hiu ti chn I0.1 khi
tn hiu I0.1 chuyn t 0 ln 1.
Gi tr ca b m s tr v 0 khi c tn hiu ti sn ln ca
chn R.
FBD LAD STL
Chng IV kt ni mng trong PLCIV.1-Mng MPI (Multi-point-Capable-Interface)
1-Gii thiu :
Mng MPI l mng giao din nhiu im phc v cho vic ni
my lp trnh vi cc thit b ngoi vi khc.Trong thit b iu
khin logic kh trnh(PLC),ch tn ti mt ng li duy nht vi
my lp trnh.MPI to ra kh nng ghp ni vi cc module kh
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n tt nghip
trnh khc nh FM. Giao din MPI c ni bng cc bus pha sau
nh mt bus truyn thng.
Ghp ni: Mt vi thit b c kh nng ghp ni d liu vi
CPU
Kh nng:Mt my lp trnh c kh nng cng lm vic song
song vi mt panel iu hnh,v ni thm mt PLC na.C th
ni ng thi ng nhiu im trong mt CPU.Bn im /node
c th ni trong CPU 314.
c im ca MPI:S linh hot ca mng MPI c th hin
bng vn bn trn mn hnh,bng cc panel iu hnh,v bngmy lp trnh ca Siemens, mng MPI cung cp cc kh nng sau
y:
*Lp trnh CPU v cng vo/ra thng minh.
*Chc nng iu hnh h thng v chc nng thng bo.
*Trao i d liu gia my lp trnh v PLC.
*Trao i chng trnh gia CPU v thit b lp trnh.
c tnh:Nhng c tnh quan trng ca mng MPI bao gm
:
*Cng RS 485 v tc truyn thng 187.5Kbaud.
>Khong cch t 50m cho n 9100m cn c khuych i
trung gian(b phc hi)
>Cc thnh phn tiu chun ca mng PROFIBUS(Cable,ni,v
b phc hi).2-Khai bo mng MPI.
khai bo mt mng MPI ta cn lm cc bc sau:
*Ta vo phn mm STEP7.
*M mt Project mi bng cch chn FileNew.
*Sau xy dng cu hnh cng cho trm PLC bng cch ta
vo
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truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
-InsertStationSimatic 300 Station
-InsertStationSimatic 400 Station
-Sau ta khai bo phn cng cho tng Progam S7-300 vS7-400
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2.3-Mng vo ra phn tn
Mng vo ra phn tn l mt mng trong cc thit b vo
ra phn tn c ghp ni vi nhau qua cc Bus nh :
+Profilbus-DP
+Profilbus-PA
Thit b vo ra phn tn khc vi mt PLC ch n khng cb x l trung tm CPU.Thay vo ,n c tch hp cc vi mch
giao din mng cng nh phn mn x l giao thc. Tu theo cu
trc ca thit b vo/ra phn tn l dng module hay dng gn
nh m phn giao din mng c thc hin bng mt module
ring bit hay khng.
Hnh trn minh ha cch ni mng Profilbus-DP cho mt thit
b vo/ra phn tn c cu trc module.V nguyn tc,phng
php ny khng khc so vi cch ghp ni cc b PLC
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PS Interface DI DO AI AOModule
Cng DP
Profibus-DP
DistributedI/0
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Chng V thit k ch to m hnh m phng
I. Kho st h thng iu khin h thng n giao thng ti ng t.
1. nguyn tc iu khin v hot ng ca h thng.
Ti mt ng t giao nhau bi hai ng ln ngi ta c rt nhiu
cch iu khin bng 3 pha. Nhng mt trong nhng cch iu
khin ang c s dng rt nhiu trong thc t, nguyn tc
hot ng nh sau:
M hnh cc n v nguyn tc iu khin hng i
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Gi s ta ang tham gia giao thng ti ng t nay. Ta s tham gia
giao thng nh sau: Khi c n xanh ng chnh, ta c quyn i
theo chiu mi tn:
Sau thi gian t c nh h thng iu khin hot ng.
H thng s chuyn t n xanh n n ca ng chnh.
H thng n diu khin trng thi ln hai, ngi tham gia giao
thng s thc hin theo chiu mi tn:
Khi h thng chuyn dch n ca h thng n phn
nhnh r. Ngi tham gia giao thng s dng li v chuyn sang cho
h thng n ng khc:
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Sau vi giy chuyn sang ng khc v hot ng theonguyn tc nh ng trn:
2. Phng php iu khin bng R le trung gian.
a) c im
Cc loi rle trung gian t ng iu khin c c im
chung l:
- Tn s ng ngt ln (10001200 ln/gi) nn yu cu c
tui th cao c th t (1 10).106 ln ng ngt.
- C rle in xoay chiu v rle in mt chiu, nhiu khi
v cng sut tiu th ca rle (t 0,1W 2W) nn li thp nam
chm in ca rle in xoay chiu c lm ging nh ca rle
in mt chiu ( li hnh tr trn bng thp khi, thn v npGVHD: nguyen dinh khanh SV:giap van thuy
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n tt nghip
+ in p vo :12VDC
+ Dng in nh mc tip im :10A
+ S lng tip im :c 2 tip im thng ng v 2 tip
im thng m.
+ ng ct Ngun : 220 VAC,10A
28 VDC, 10A+ Cng sut tiu th : 1,6 W (DC).
3. Cu hnh chung ca thit b m phng.
M hnh gm cc thit b sau:
+Khung hp lm sn
+H thng cc ct v bng n
+H thng iu khin
Trong :
Khung sn: c lm bng g, c kch thc 85cm . 85cm . 10cm.
y l ni lm sn dung ct n ng thi t cc linh kin
v ton b h thng i dy trong lng khung
H thng cc ct v bng:
+Ct c lm bng Inox v tng s c 8 ct: 4 ct nh v 4 ctln cho ng chnh. Ct nh c kch thc: ng knh 15cm, chiu
cao 20cm. Ct ln c chiu cao 28cm.
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n tt nghip
+H thng bng: bao gm 44 bng phn lm 3 loi, 12 bng
mu vng, 16 bng mu xanh, 16 bng mu . L loi bng
in t c cng sut 4,4 W.
4. Gin thi gian.
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n tt nghip
RL1
RL2
RL5
RL4
RL3
RL10
RL9
RL8
RL7
RL6
RL12
RL11
RL0
RL4
Start
Ch thch: theo nguyn tc hot ng ca h thng n th
rt kh c th xc nh c gin thi gian ca c h thng.
Do vy, chng ta phi tm cc n hot ng cng mt khong
thi gian v nhm vo mt r le. Cc thi gian ny c cc b thi
gian trong PLC iu khin.
*Mch in iu khin tng trng thi ca h thng
n.
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n tt nghip
H thng hot ng theo ng 1 chu k th phi hot ng
qua 12 trng thi.
RL0
RL1
RL2
RL3
RL4
H1
3
X3
K1
4
L1
7
10
PLCQ0.0
Q0.1
Q0.2
Q0.3
Q0.4
Thuong dong
RL0
RL5
RL2
RL3
RL4
H1
2
X2
K1
4
L1
7
10
PLCQ0.0
Q0.5
Q0.2
Q0.3
Q0.4
Thuong dong
1
1
2
3
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2L3
L1L2
L3
K1K2K3
K1K2
K3
1
1
2
3
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2
L3
L1
L2L3
K1K2K3
K1
K2K3
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n tt nghip
RL0
RL6
RL2
RL3
RL4
H1
1
X1
K1
4
L1
7
10
PLC
1
1
2
3
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2
L3
L1
L2L3
K1K2K3
K1
K2K3
Q0.0
Q0.6
Q0.2
Q0.3
Q0.4
Thuong dong
RL7*
RL6
RL2
RL3
RL4
H3
1
X1
K1
4
L1
7
10
PLC
1
1
2
3
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2
L3
L1L2L3
K1K2K3
K1K2K3
Q0.4
Q0.3
Q0.2
Q0.6
Q0.7
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n tt nghip
1
1
23
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2L3
L1L2L3
K1K2K3
K1K2K3
RL0
RL6
RL9*
RL3
RL4
H1
1
X1
K3
6
L1
8
9
Thuong mo
PLC
Q0.3
Q1.1
Q0.6
Q1.7
RL0
RL6
RL10
RL3
RL4
H1
1
X1
K2
5
L1
8
9
Thuong mo
PLC
Q0.3
Q1.2
Q0.6
Q1.7
Q0.4
Q0.4
1
1
23
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L 1L 2L 3
L 1
L 2L 3
K1K2K3
K1
K2K3
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n tt nghip
RL0
RL6
RL2*
RL3
RL4
H1
1
X1
K1
4
L1
8
9
PLC
1
1
23
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2L3
L1L2L3
K1K2K3
K 1K 2K 3
Q1.7
Q0.6
Q1.6
Q0.4
Q0.3
Thuong mo
RL0
RL6
RL2
RL11
RL4
H1
1
X1
K1
4
L3
8
9
PLC
1
1
23
23
45 6
456
7 8
78
910
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L1L2L3
L1L2L3
K1K2K3
K1K2K3
Thuong mo
Q1.7
Q0.6
Q1.6
Q1.3
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n tt nghip
1
1
23
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L 1L 2L 3
L 1L 2L 3
K1K2K3
K1K2K3
RL8*
RL6
RL2
RL3
RL4
H2
1
X1
K1
4
L1
7
10
PLCQ1.0
Q0.6
Q0.2
Q0.3
Q0.4
RL0
RL6
RL2
RL3
RL4
H1
1
X1
K1
4
L1
7
10
PLCQ1.7
Q0.6
Q1.6
Q0.3
Q0.4
1
1
23
23
4 5 6
456
7 8
78
9 10
10 9
X1X2X3
X1X2X3H1H2H3
H1H2H3
L 1L 2L 3
L1
L2L3
K1K2K3
K1
K2K3 PLCPLC
Chu trnh ca h thng n li c lp li theo chu k ban
u.
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n tt nghip
*Mch iu khin bng PLC.
1. Bng quy nh u vo ra.
*Chng trnh ca h thng.
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n tt nghip
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n tt nghip
GVHD: nguyen dinh khanh SV:giap van thuy
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n tt nghip
GVHD: nguyen dinh khanh SV:giap van thuy
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n tt nghip
GVHD: nguyen dinh khanh SV:giap van thuy
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n tt nghip
Chng VI: ng dng ca PLC v h thng m hnh.
I.ng dng ca PLC.
PLC c ng dng rt rng ri nhiu lnh vc khc nhau
VD:
- iu khin h thng chiu sng trong cc ca hng, siu
th, nh hng,nh xng.
- iu khin ng m my cc ng c.- iu khin h thng n giao thng.
- H thng nng, vn chuyn.
- Dy truyn ng gi.
- Cc ROBOT lp rp sn phm.
- iu khin bm.
- Cng ngh sn xut giy.
- Cng ngh ch bin thc phm.
- Dy truyn ch to linh kin bn dn.
- Dy truyn lp gip tivi
- Dy truyn sn xut xi mng.
- iu khin bm.
- Dy truyn x l ho hc.
GVHD: nguyen dinh khanh SV:giap van thuy
91
-
7/31/2019 Do an Dung Plc Dieu Khien Den Giao Thong
92/95
truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
- ng dng trong h thng bn nc t ng, my in hoa
vn
Gii thiu v h thng iu khin m my ng c
o chiu gin tip:
Yu cu cng ng:
Khi nhn nt khi ng ng c quay thun I0.1cp in
ng c quay thun, khi y c nhn nt khi ng ng c
quay ngc th ng c cng khng th quay ngc c. Nh vy
ch cho php khi ng ng c quay ngc khi nhn nt
dng I0.0.
Bng quy nh u vo ra:
Ch ng trnh lp trnh :
GVHD: nguyen dinh khanh SV:giap van thuy
92
-
7/31/2019 Do an Dung Plc Dieu Khien Den Giao Thong
93/95
truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
LI KT
Sau khi nhn ti chng em xc nh r nhim v
v trch nhim ca mnh vi ti c giao. Qua vic
nghin cu ti tham kho ti liu cng kin thc hc,
cng vi s gip , hng dn nhit tnh ca thy gio
nguyen dinh khanh cng gip ca bn b cng vi s l lc
ca bn thn n nay ti ca chng em hon c
thnh. Trong qu trnh hon thnh ti chng em cn
nhiu sai st v cn nhiu trng hp trong thc t khng gii
quyt c. Chng em mong cc thy c gio v bn b trong
ngnh ng gp kin cho chng em nhng ti v
sau tt hn. Vi thi gian c hn nn mt s phn chng em
GVHD: nguyen dinh khanh SV:giap van thuy
93
-
7/31/2019 Do an Dung Plc Dieu Khien Den Giao Thong
94/95
truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
cha c hon chnh, chng mong cc bn ra sau s pht huy
kh nng v vn kin thc ca mnh lm tt hn.
Trong qu trnh hon thnh ti, chng em
trnh by mt cch ngn gn, d hiu v c h thng gip
cho bn c thun li cho qu trnh nghin cu v ng dng.
Chng em rt mong thy c gio v bn b ng gp kin
chng em hon thnh tt hn nhng phn c giao sau.
Chng em xin chn thnh cm n thy gio nguyen
dinh khanh Ging Vin khoa in - in T gip
chng em hon thnh ti ny!
bac giang, Ngy 15 thng 6
nm 2010!
Sinh vin thc hin : giap van thuy
Ti liu tham kho
1. ng dng PLC SIEMENS v MOELLER trong t ng ho.
Nguyn Tn Phc. Nh xut bn TP H ch minh .
2. T ng Ho vi Simentic S7-300 Nguyn Don Phc, Phan Xun
Minh NXB KH-KT 2000.
3. Phn mn Simen LOGO Version 4.0.GVHD: nguyen dinh khanh SV:giap van thuy
94
-
7/31/2019 Do an Dung Plc Dieu Khien Den Giao Thong
95/95
truong cao dang nghe bac giang thuyt minhKhoa in - in t
n tt nghip
4. Lp trnh PLC vi S7 - 300 tc gi Nguyn Xun Cng ging
vin i hc s phm k thut Hng Yn
5. www.siemens.com/logo
6. Lun vn thc s v PLC ca H Bc
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