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iu khin lp trnh
TRNG I HC NHA TRANG KHOA iN-iN T B MN IN CNG NGHIP
GV: BI THC MINH
Nha Trang 2011
Yu cu mc ch Yu cu: Sinh vin phi hiu v cc mch iu khin c tip im, thit k mch bng cng logic, Trnh c bn v my tnh.
Mc ch: sau khi hc xong mn hc ny sinh vin: Hiu bit cc kin thc c bn v iu khin lp trnh, cu to phn cng, phn mm ca h iu khin lp trnh. Phn tch, thit k, vit chng trnh s dng PLC.
Bin son: Bi Thc Minh
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iu khin lp trnh
Ti liu tham kho[1] Phan Xun Minh, Nguyn Don Phc T ng ha vi SIMATIC S7-200 NXB Nng nghip 1997 [2] BM in Cng nghip, Bi ging iu khin lp trnh [3] S tay hng dn s dng FX-TRN-BEG-E Khoa in Trng H Cng nghip Tp.HCM, Cng ty TNHH Sa Giang [4] Trn Th San, Nguyn Ngc Phng PLC Lp trnh ng dng trong cng nghip - NXB KHKT - 2008 [5] W. Bolton - Programmable Logic Controllers [6] Hugh Jack - Automating Manufacturing Systems with PLCs [7] SIEMENS - S7-200 Programmable Controller System Manual Edition 04/2002 [8] Visual Guide to Programming OMRON PLCs
NI DUNGChng 1 i cng v iu khin lp trnh Chng 2 Cu trc v phng php hot ng ca PLC Chng 3 Cc php ton nh phn ca PLC Chng 4 Cc php ton s ca PLC Chng 5 Cc h PLC khc
Bin son: Bi Thc Minh
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iu khin lp trnh
n tp kin thc v iu khin V s iu khin, ng lc mt s mch yu cu iu khin ng c KB ba pha r to lng sc sau: Khi ng trc tip. Khi ng gin tip: sao-tam gic, cun khng, o chiu quay ng c: trc tip, gin tip Khi ng sao/tam gic thun/nghch Mch tun t: m my M1->M2->M3; dng ngc li
PLC (Programmable Logic Control)
PLC l thit b iu khin Logic kh trnh cho php thc hin linh hot cc thut ton iu khin Logic thng qua 1 ngn ng lp trnh Bn cht PLC l g? C bao nhiu loi PLC? Nn s dng loi no? Chn ngn ng lp trnh no?
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iu khin lp trnh
Mt s loi PLC SIEMENS (C) ABB (PHN LAN) OMRON (NHT) DELTA (I LOAN) PANASONIC (NHT) MITSUBISHI (NHT),
Cac loai PLC S7 cua SiemensS7-200
S7-300 S7-400
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iu khin lp trnh
Vai tr ca PLC Trong mt h thng t ng, ni chung PLC c v nh l con tim ca h thng iu khin. Vi chng trnh ng dng iu khin (c lu tr trong b nh PLC) trong vic thc thi, PLC thng xuyn gim st tnh trng h thng qua tnh hiu phn hi ca thit b u vo. Sau s da vo s hp l ca chng trnh xc nh tin trnh hot ng c thc hin nhng thit b xut cn thit.
PLC c th c s dng iu khin: Nhng nhim v n gin c tnh lp i lp li Nhim v c th c lin kt cng nhau vi thit b iu khin ch hoc my tnh ch khc qua mt loi mng giao tip tch hp iu khin ca mt qu trnh phc tp.
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iu khin lp trnh
u im ca PLCNhng bat li cua bang ieu khien co ien - Co qua nhieu day trong bang ieu khien - S thay oi hoan toan kho khan - Viec sa cha vo cung phien phc v ban phai can en nha ky thuat gioi - Tieu thu ien nang ln khi cuon day cua r le tieu thu ien - Thi gian dng may la qua dai khi s co xay ra, v phai mat mot thi gian dai e sa cha bang ieu khien - No gay ra thi gian dng may lau hn khi bao tr va ieu chnh khi cac ban ve khong con nguyen ven qua thi gian nhieu nam.
Thun li ca iu khin lp trnh - Khong can au day cho s o ieu khien logic nh kieu dung r le. - Co o mem deo s dung rat cao, khi ch can thay oi chng trnh (phan mem) ieu khien. - Chiem v tr khong gian nho trong he thong. - Nhieu chc nang ieu khien. - Toc o cao. - Cong suat tieu thu nho. - Khong can quan tam nhieu ve van e lap at. - Co kha nang m rong so lng au vao/ra khi noi them cac khoi vao/ra chc nang. - Tao kha nang m ra cac lnh vc ap dung mi.
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iu khin lp trnh
Nhc im ca PLC + Gi thnh cao (phn cng + phn mm) + i hi ngi s dng phi c chuyn mn
07/09/11 11:02 PM
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V gi tr kinh t Khi xt v gi tr kinh t ca PLC ta phi cp n s lng u ra v u vo. Quan h v gi thnh vi s lng u vo/ra c dng nh hnh bn
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iu khin lp trnh
Khi tnh n gi c ca PLC th phi k n cc b phn ph nh thit b lp trnh, my in, bng ghi...c vic o to nhn vin k thut. Ni chung nhng phn mm thit k lp trnh cho cc mc ch c bit l kh t. Ngy nay nhiu hng ch to PLC cung cp trn b ng gi phn mm c th nghim, nhng vic thay th, sa i cc phn mm l nhu cu khng th trnh khi. Do , vn cn thit phi c k nng phn mm.
07/09/11 11:02 PM
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Phn b gi c cho vic lp t mt PLC thng nh sau: + 50% cho phn cng ca PLC + 10% cho thit k khun kh chng trnh + 20% cho son tho v lp trnh + 15% cho chy th nghim + 5% cho ti liu. Vic lp t mt PLC tip theo ch bng khong 1/2 gi thnh ca b u tin, ngha l hu nh ch cn chi ph phn cng.07/09/11 11:02 PM 16
Bin son: Bi Thc Minh
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iu khin lp trnh
ng dng ca PLC PLC c s dung kha rong rai trong cac nganh: Cong nghiep, May nong nghiep, Thiet b y te, Oto (xe hi, can cau)
S dung bo ieu khien PLCThay oi he thong nhanh chong va de dang
Kch thc nho gon
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iu khin lp trnh
Phn loi phng php iu khin Trong lnh vc ieu khien Phng phap ieu khien noi cng Phng phap ieu khien lap trnh c
Trong cac he thong ieu khien noi cng: Noi cng co tiep iem Noi cng khong tiep iem
Ni cng c tip im Dung cac kh cu ien nh rle, cong tac t ket hp vi cac bo cam bien, cac nut nhan, cong tac. Cac kh cu ien nay c noi lai vi nhau theo mot mach ien cu the e thc hien mot yeu cau cong nghe nhat nh. Th du: Mach ieu khien ao chieu quay, mach khi ong gii han dong hay mach ieu khien ong c chay tuan t va dng tuan t
Bin son: Bi Thc Minh
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iu khin lp trnh
ieu khien noi cng khong tiep iem - Dung cac cong logic c ban, cac cong logic a nang hay cac mach tuan t (goi chung la IC so), ket hp vi cac bo cam bien, cac nut nhan, cong tac. - Cac IC so nay cung c noi lai vi nhau theo mot s o logic cu the e thc hien mot yeu cau cong nghe nhat nh. - Cac mach ieu khien noi cng s dung cac linh kien ien t cong suat nh SCR, Triac e thay the cong tac t trong cac mach ong lc
- Trong he thong ieu khien noi cng, cac linh kien hay kh cu ien c noi vnh vien vi nhau. - Do o, khi muon thay oi lai nhiem vu ieu khien th phai noi day lai toan bo mach ien. Vi cac he thong phc tap th khong hieu qua va rat ton kem
Bin son: Bi Thc Minh
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iu khin lp trnh
Phng phap ieu khien noi cng c thc hien theo cac bc sau:
Phng phap ieu khien lap trnh c - Trong cac he thong ieu khien lap trnh c, cau truc cua bo ieu khien va cach noi day oc lap vi chng trnh. - Chng trnh nh ngha hoat ong ieu khien c ghi trc tiep vao bo nh cua bo ieu khien nh s tr giup cua bo lap trnh (PG) hay may vi tnh (PC) - e thay oi chng trnh ieu khien, ch can thay oi noi dung bo nh cua bo ieu khien, phan noi day ben ngoai khong b anh hng. ay la u iem ln nhat cua phng phap lap trnh ieu khien c.
Bin son: Bi Thc Minh
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iu khin lp trnh
Qui trnh thit k iu khin dng PLC:1. Xc nh c qui trnh iu khin 2. Xc nh tn hiu vo ra 3. Son tho chng trnh 4. Np chng trnh cho PLC 5. Chy chng trnh
Cau truc cua PLCNgo vao CPU Ngo ra
PLC
Bo lap trnh
Module m rong
Bin son: Bi Thc Minh
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iu khin lp trnh
Cu trc phn cng ca PLC
B x l trung tm (Central Processing Unit): l mt vi x l nh hng hot ng ca PLC. N thc hin cc lnh trong chng trnh, x l tn hiu xut nhp v lin lc vi cc thit b ngoi vi.
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iu khin lp trnh
B nh: c nhiu loi b nh. l vng cha h iu hnh v vng b nh ca ngi s dng: ROM (Read Only Memory) RAM (Random Access Memory) EPROM (Erasable Programable Read Only Memory) EEPROM Memory) (Electrically Erasable Programable Read Only
Cu trc chung h thng iu khin dng PLCCc thit b to ra tn hiu iu khin, thng l nt nhn, cm bin
- Ng vo dng s - Ng vo tng t - Ng ra dng s - Ng ra tng t
Thit b bin i tn hiu in t PLC thnh mt tc ng vt l
mt chng trnh bao gm mt hay nhiu lnh nhm thc hin mt nhim v c th
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iu khin lp trnh
Mch u vo (Input Unit) l cc mch in t lm nhim v phi ghp chuyn i gia tn hiu u vo v tn hiu s dng trong PLC. Kt qu ca vic x l s c lu vng nh Input. Mch u vo c cch ly v in vi cc mch trong PLC nh cc diod quang.
Mch u ra (Output Unit) mch in t u ra s bin i cc lnh mc logic bn trong PLC (vng nh Output) thnh tn hiu iu khin nh ng m rle
Thit b lp trnh
Bin son: Bi Thc Minh
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iu khin lp trnh
Nt nhn thng m
Nt nhn thng ng Cng tc thng m
Cng tc thng ng
Tip im thng m Tip im thng ng
Cc dng tn hiu ng vo ca PLC
Cc thit b vo thng gp
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iu khin lp trnh
Cc thit b ra thng gp
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iu khin lp trnh
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iu khin lp trnh
PLC S7-200 ieu khien thiet bBong en
Cong tac
ieu khien dung PLC
C cau chap hanh
ieu khien
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iu khin lp trnh
iu khin qua contactor
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iu khin lp trnh
Them module m rongCap noi
CPU
Module m rong
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iu khin lp trnh
Gan PLC len RailGia
CPU
Module m rong
So module m rong toi a
Chieu m rong
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iu khin lp trnh
en bao hieuen hieu ngo ra
en hieu RUN/STOP
en hieu ngo vao
at ten cho cac ngo vao ra
8 bit = 1 byte
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iu khin lp trnh
Ket noi tn hieu ngo vao cho PLCNguon 24Vdc ra t PLC COM ngo vao
Ngo vao PLC
Nut nhan
Cong tac
Ket noi tn hieu ngo ra cua PLCBong en Relay Ngo ra cua PLC
COM ngo ra Cap nguon AC cho PLC
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iu khin lp trnh
Ket noi tn hieu PLC
en
Cong tac
Cu trc b nh
Vng chng trnh: l min b nh c s dng lu gi cc lnh chng trnh. Vng tham s: l min lu gi cc tham s nh: T kha, a ch trm Vng d liu: c s dng ct cc d liu ca chng trnh bao gm cc kt qu cc php tnh, hng s c nh ngha trong chng trnh, b m truyn thng Vng i tng: Timer, b m, b m tc cao v cc cng vo/ra tng t c t trong vng nh cui cng
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iu khin lp trnh
Vng d liu
V : Variable memory. I : Input image register. O : Output image register. M : Internal memory bits. SM : Special memory bits.
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Truy xut d liu bng a ch vng nh
Cch gi tn Byte.Bit
So snh cch gi tn Byte, Word, v Double-Word n cng mt a ch
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iu khin lp trnh
Biu din cc s S thc (hay cn gi l chm ng) c th biu din bng mt con s n, chnh xc, 32 bit c nh dng nh sau: t +1.175495E-38 n +3.402823E+38 cho phn dng, v t -1.175495E-38 n -3.402823E+38 cho phn m. S thc c truy xut theo di vng nh l Double-Word.
Cch gi tn thanh ghi m ng vo (I) Ngay khi bt u mi vng qut, CPU s ly thng tin cc ng vo v ghi cc gi tr ny vo thanh ghi m ng vo. Chng ta c th truy xut thanh ghi m ng vo theo Bit, Byte, Word, hay Double-Word nh dng:
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iu khin lp trnh
Cch gi tn thanh ghi m ng ra (Q) Ngay thi im kt thc mi vng qut, CPU s chp cc gi tr lu tr trong cc thanh ghi m ng ra vo cc ng ra. Chng ta c th truy xut thanh ghi m ng vo theo Bit, Byte, Word, hay Double-Word nh dng:
Cch gi tn vng nh bin (V) Chng ta c th s dng vng nh V lu tr cc kt qu tc thi ca thao tc c iu khin bi cc iu khin logic trong chng trnh. Vng nh V c th c truy xut theo Bit, Byte, Word, hay Double-Word. nh dng:
Bin son: Bi Thc Minh
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iu khin lp trnh
Cch gi tn vng nh Bit (M) Vng nh M nh cc relay iu khin lu tr cc trng thi tc thi ca thao tc hay cc thng tin iu khin khc. Truy xut vng nh ny theo Bit. Tuy nhin, chng ta cng c th truy xut n theo Byte, Word, hay DoubleWord. nh dng:
Cch gi tn vng nh relay iu khin tun t (S) nh dng:
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iu khin lp trnh
Cch gi tn cc bit nh c bit (SM) nh dng:
Cch gi tn vng nh Timer (T) Trong CPU S7-200, cc timer l cc thit b thc hin nhim v m thi gian. Cc timer ca S7-200 c cc phn gii nh 1ms, 10ms, 100ms nh dng:
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iu khin lp trnh
Cch gi tn vng nh Counter (C) CPU S7-200, cc counter l cc thit b thc hin nhim v m mi ln chuyn trng thi t thp ln cao khi c tn hiu ng vo ca counter nh dng:
S dng cc gi tr hng s
V d:
Bin son: Bi Thc Minh
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iu khin lp trnh
a ch truy nhp c qui c vi cng thc Truy nhp theo bit: Tn min (+) a ch byte (+).(+) ch s bit. V d: V153.2 ch bit 2 ca byte 153 vng V Truy nhp theo byte: Tn min (+) B (+) a ch byte trong min. V d: VB153 ch byte 153 ca vng V Truy nhp theo t: Tn min (+) W (+) a ch byte cao ca t trong min. V d: VW153 ch t n gm 2 byte 153 v 154 thuc min V, trong byte 153 c vai tr l byte cao trong t
Truy nhp theo t kp: Tn min (+) D (+) a ch byte cao ca t kp trong min. V d: VD153 ch t kp gm 4 byte 153, 154 ,155 v 156 thuc min V, trong byte 153 c vai tr l byte cao v byte 156 c vai tr l byte thp trong t kp
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iu khin lp trnh
Tnh Nng Ca Cc CPU S7-200
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X l chng trnh Chng trnh chnh Chng trnh con Chng trnh ngtCu trc chng trnh c r rng hn
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iu khin lp trnh
V d
Chu k qut
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iu khin lp trnh
Cc phng php lp trnh Ladder Diagram (LAD): phng php dng th biu din cc k hiu logic ca relay, contactor Statement list (STL): dng ngn ng gi nh m t cc php logic v qua biu din chc nng iu khin, dng chng trnh ny tng t nh chng trnh cho vi x l
Function Block Diagram (FBD): l phng phpdng cc khi hm m t cc khi chc nng thc hin mt php ton logic no nh AND, OR, EX-OR hoc chc nng ca b m, b nh th
-Dng LAD
V d: Chng trnh khi ng ng c
-Dng STL
-Dng FBD
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iu khin lp trnh
Mt s bi tp Mch khi ng trc tip ng c Mch o chiu quay ng c KB ba pha Mch khi ng 3 ng c c lp & dng c lp Khi ng tun t 3 ng c Mch khi ng sao/tam gic
Mt s lnh vo/ra Mt s lnh vo
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iu khin lp trnh
Lnh ra
Cc lnh tip im c bit C th dng cc lnh tip im c bit pht hin s chuyn tip trng thi ca xung (sn xung) v o li trng thi ca dng cung cp (gi tr ca nh ngn xp). LAD s dng cc tip im c bit tc ng vo dng cung cp
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iu khin lp trnh
Cc lnh tip im c bit
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iu khin lp trnh
NETWORK 1 LD I0.0 A I0.1 = Q0.0 NOT = Q0.1 NETWORK 2 LD I0.2 ON I0.3 = Q0.2 NETWORK 3 LD I0.4 LPS EU S Q0.3, 1 = Q0.4 LPP ED R Q0.3, 1 = Q0.5
Gin thi gian
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iu khin lp trnh
Bi tp1. Vit chng trnh nt nhn ON/OFF 2. Chng trnh to tn hiu xung c tn s 0,5Hz 3. Vit chng trnh iu khin 1 ng c KB 3 pha theo yu cu Dng 1 nt nhn ON/OFF n bo Khi lm vic ng c chy 5 pht dng 1 pht v chu k lm vic lp li Khi s c (cun dy khng ht tip im) ng ra iu khin phi RESET => thng bo li ln n bng tn hiu xung 0,5Hz. C nt nhn RESET xa liBin son: Bi Thc Minh 85
4. Chng trnh to thi gian tr 1000h dng Timer c phn gii 1s 5. Mch ng lc, kt ni PLC, lp bng cc bin s dng v vit chng trnh iu khin 1 ng c KB 3 pha khi ng sao-tam gic theo yu cu sau: ----
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iu khin lp trnh
NI DUNG1. Lnh iu khin Timer 2. Lnh iu khin Counter 3. Mt s v d
MC TIU BI HC Bit mt s loi Timer, Counter trong b lp trnh PLC Hiu nguyn l hot ng ca cc loi Timer, Counter ng dng cc lnh Timer, Counter vit chng trnh iu khin
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1. Lnh iu khin Timer Timer l b to thi gian tr gia tn hiu vo v tn hiu ra nn trong iu khin vn thng gi l khu tr. Phn loi :On-Delay Timer
TIMER
Off-Delay Timer On-Delay Timer Retentive
Cc loi TimerS hiu Gi tr t
On Delay Timer
Off Delay Timer
On-Delay Timer Retentive
Thi gian tr T = PT* phn gii
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On Delay Timer
OFF => ON
Ton
Gin thi gian
On Delay Timer
Ton = PT* phn gii
V d cch s dng On-Delay Timer
Thi gian tr T = PT* phn gii (T = 100*10ms = 1s)
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Off Delay Timer
ON=>OFF
Toff
Off Delay Timer
Gin thi gian
V d cch s dng Off-Delay Timer
Thi gian tr T = PT* phn gii (T = 100*10ms = 1s)
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VD cch s dng On-Delay Timer Retentive
=> S khc nhau gia :On-Delay Timerv
On-Delay Timer Retentive
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2. Lnh iu khin Counter Counter l b m thc hin m sn xung trong S7 200 Phn loi :Up Counter
COUNTER
Down Counter
Up/Down Counter
Counter cua PLC S7-200
em len Reset
em xuong Load
em len em xuong Reset
Gia tr em
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iu khin lp trnh
V d cch s dng Down Counter
VD cch s dng Up/Down CounterNg vo Ng ra Reset
Bo y
em so xe vao oan ng co gii han so lng xe lu thong
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GIN THI GIAN
Phn a ch vo/rau vo (Input) START STOP I0.0 I0.1 u ra (Output) n Xanh 1 n Vng 1 n 1 n Xanh 2 n Vng 2 n 2 Q0.0 Q0.1 Q0.2 Q0.3 Q0.4 Q0.5
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M HNH N GIAO THNG
S KT NI PLC
S kt ni PLC
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CHNG TRNH PLCStart n xanh 1
Stop
n vng 1
n 1
n xanh 2
n vng 2
n 2
CU HI BI TP1. So snh gia Timer khng nh v Timer c nh? 2. Vit chng trnh iu khin ng c khi ng sao/tam gic? 3. Vit chng trnh to xung? 4. Vit chng trnh iu khin n giao thng ng t, mt tuyn ng u tin?
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Cch tm ti liu trn mng internet- www.google.com.vn => PLC timer counter siemens logo!soft comfort application collection
- Online Help simatic Step 7 MicroWin 32 V3.2
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DY CHUYN NG HP TO Dy chuyn ng hp to gm 2 bng ti: bng ti thng v bng ti to, c hai bng ti u c ko bi ng c in (xem hnh trang sau). Dy chuyn hot ng nh sau:
M HNH DY CHUYN NG HP TOHot ngCB1 Tc ng
START
CB2 Tc ng
Hot ng
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Yu cu Khi nhn nt th dy chuyn hot ng, bng ti thng chy a thng rng n ng v tr ca bng ti to. Khi thng n ng v tr n s tc ng vo 1 cng tc hnh trnh (cm bin CB2 trn hnh v) lm trng thi cng tc ny ON. Khi bng ti thng dng v bng ti to bt u chy lm to ri vo thng. Mi khi c mt qu to ri vo thng th cm bin quang m to (cm bin CB1 trn hnh v) chuyn trng thi t OFF sang ON. Khi s to qui nh (chng hn 10 tri/thng) th bng ti to dng li, bng ti thng li chy a thng rng khc n ng v tr. Nhn bng ti dng li.
Phn a ch vo/rau vo (Input) START STOP Cm bin m to I0.0 I0.1 I0.2 u ra (Output) ng c ko bng ti thng ng c ko bng ti to Q0. 0 Q0. 1
Cm bin pht hin thng I0.3
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iu khin lp trnh
S KT NI PLC
CHNG TRNH PLC
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Hien nay PLC a c nhieu hang khac nhau san xuat nh: Siemens, Omron, Mitsubishi, Festo, Alan Bradley, Schneider, Hitachi ... vv. Mat khac ngoai PLC cung a bo sung them cac thiet b m rong khac nh: cac cong m rong AI (Analog Input), DI (Digital Input), cac thiet b hien th, cac bo nh Cartridge them vao.
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