tu hoc plc

[ ] 1

Hng dn t hc PLC CPM1 qua hnh nh Chng 1: Gii thiu chung b CPM1 Training Kit

!!!! B CPM1 dnh cho vic o to th nghim - CPM1 Training Kit

1.1 B CPM1 chun (B hng dn t hc CPM1 trong phng th nghim)

L b PLC c thm cc kho chuyn mch m phng u vo v cc n hin th u ra, c khung g v km theo sch hng dn v phn mm

1.2 B CPM1 thu gn (B hng dn t hc CPM1 xch tay - CPM1 Laptop Training Kit)

Cng c thm cc cng tc u vo nh trn nhng b PLC nh gn hn, khng c khung g, n ch th u ra l n nm ch th ca PLC.

Men PLC dng cho b th nghim l loi CPM1-20CDR-A c 20 u vo ra, trong 12 u vo 24V mt chiu, v 8 u ra tip im rle.

[ ] 2

Hng dn t hc PLC CPM1 qua hnh nh Chng 1: Gii thiu chung b CPM1 Training Kit

!!!! Cc model trong h CPM 1

CPM1-10CDR-

CPM1-20CDR-

CPM1-30CDR-

11

12

3

Hng dn t hc PLC CPM1 qua hnh nh Chng 2: Cu trc c bn ca PLC

!!!! Cu trc c bn ca b iu khin logic lp trnh PLC (Programmable Logic Controller)

2.1 Cc h m (Number System) " H nh phn (h 2) (Binary) " H thp phn (h 10) (Decimal) " H thp lc (hay h hexa - h 16) (Hexadecimal)

1. H nh phn (hay h 2 - Binary (BIN)) L h m trong ch s dng 2 con s l 0 v 1 (gi l bit) biu din tt

c cc con s v i lng. Tt c cc gi tr bn trong PLC u dng nh phn 2. H thp phn (hay h 10 - Decimal (DEC)) L h m thng thng v s dng 10 ch s l 0 1 2 3 4 5 6 7 8

9 biu din cc con s. H thp phn cn kt hp vi h nh phn c cch biu din gi l BCD (Binary-Coded Decimal)

3. H 16 (hay h 16 - Hexadecimal-HEX)) L h m s dng 16 k s l 0 1 2 3 4 5 6 7 8 9 A B C D

E F (trong c 10 ch s t 0-9, cc ch s t 11 n 15 c biu din bng cc k t t A-F) !!!! Cch biu din cc i lng bn trong PLC Khi biu din cc con s theo cc h m khc nhau, phn bit ngi ta thng thm cc ch BIN (hoc s 2 ), BCD hay HEX (hoc h) vo cc con s

HEX BCD Biu din bng s nh phn 4 ch s 23 = 8 22 = 4 21 = 2 20 = 1

0 0 0 0 0 0 1 1 0 0 0 1 2 2 0 0 1 0 3 3 0 0 1 1 4 4 0 1 0 0 5 5 0 1 0 1 6 6 0 1 1 0 7 7 0 1 1 1 8 8 1 0 0 0 9 9 1 0 0 1 A - 1 0 1 0 B - 1 0 1 1 C - 1 1 0 0 D - 1 1 0 1 E - 1 1 1 0 F - 1 1 1 1

4


V d S 2F61 trong h Hexa s c biu din nh sau trong PLC

2.2 Cu trc c bn ca PLC OMRON

PLC gm c 4 thnh phn c bn sau:

1. Input Area : Cc t n hiu nhn vo t cc thit b u vo bn ngoi (Input Devices) s c lu trong vng nh ny

2. Output Area : Cc lnh iu khin u ra s c lu tm trong vng nh ny. Cc mch in t trong PLC s x l lnh v a ra t n hiu iu khin thit b ngoi (Output Devices)

3. B x l trung tm (CPU) l ni x l mi hot ng ca PLC, bao gm vic thc hin chng trnh

4. B nh (Memory) l ni lu chng trnh iu khin v cc trng thi nh trung gian trong qu trnh thc hin

# Mch u vo (Input Unit)

L cc mch in t lm nhim v phi ghp chuyn i gia t n hiu in u vo (Input) v t n hiu s s dng bn trong PLC. Kt qu ca vic x l s c lu vng nh Input Area. Mch u vo c cch ly v in vi cc mch trong ca PLC nh cc it quang. Bi vy, h hng mch u vo s khng nh hng n hot ng ca CPU.

B PLC o to th nghim c in p u vo l 24V mt chiu.

Input area

Output area

CPU

Memory area

Power Supply

INPUT DEVICES OUTPUT DEVICES

2 F 6 1

0010 1111 0110 0001

5


# Mch u ra (Output Unit)

Mch in t u ra s bin i cc lnh mc logic bn trong PLC (trong vng nh Output Area) thnh cc t n hiu iu khin nh ng m rle. B training kit c mch u ra bao gm 8 tip im rle, ch u c dng ti a 2 A Xin xem Ph lc trong ti liu Hng dn t hc PLC bit thm chi tit thng s k thut u vo ra ca PLC loi CPM1 % Cc thit b vo ra thng gp

Sensor tim cn Sensor quang

ENCODER COUNTER LIMIT SWITCH

Bm

Rle

Can nhit

OUTPUT DEVICES

ng c

n

INPUT DEVICES

6


% Ni dy u vo PLC Switch

Cc cng tc trn b CPM1 PLC training kit s ly ngun t u ra

Power Supply Output 24 VDC c sn ca PLC vi dng ra tng cng ti a l 0.3A. Cc cng tc ny m phng cc u vo s (l cc u vo ch c 2 trng thi) trong thc t bng cch bt tt bng tay cc cng tc ny, do vy thun tin trong vic th nghim hay o to.

Di y l 1 v d khi u dy u vo vi cc thit b c trong thc t thay cho cng tc m phng :

% Cc cch ni u vo s ca PLC c th c 3 dng sau: 1) u vo l tip im rle (Relay)

& &

& &

'

' '

' ' '

'

'

'

00

01

02

03

04

05

06

07

08

09

10

11

+ 24VDC

- 0V

Nt bm

Cng tc gii hn

u pht

Sensor tim cn

u thu

Sensor quang loi thu pht

Mch lin ng

'

COM

.

. Relay

5 mA/12 mA CPM1 IN

COM ( + )

7


2) u vo l transistor kiu NPN

3) u vo l transistor kiu PNP

Ch Dng vo ca cc u vo IN00000- IN00002 = 12 mA Dng vo ca cc u vo khc = 5 mA Khi u vo ca PLC mc ON, cc n tng ng trn PLC u sng

# Cc a ch b nh (Address) trong PLC Tt c cc u vo ra cng nh cc b nh lu tr khc trn PLC khi s dng trong chng trnh u thng qua cc a ch b nh tng ng. Cc a ch b nh c t chc thnh cc nhm gm 16 bit gi l word hay Channel (CH). Mi bit c gi tr 0 hoc 1. Cc bit c nh s t 00 n 15 t phi qua tri. a ch y ca mi bit s c k hiu bng 5 ch s: 3 ch s u t tri qua l k hiu ca channel, 2 ch s tip theo l s th t ca bit.

15 14 13 12 11 10 09 08 07 06 05 04 03 00 01 02 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 0 CH000

CH001

CH002

CPM1 5 mA /12 mA

Sensor

IN

COM (+)

Sensor power Supply Output

+

0 V

CPM1

5 mA /12 mA IN

COM (-)

Sensor power Supply

Output

+

0 V

8


Khi tham chiu n tng bit ny, ta phi ch nh a ch ca

channel (word) v s ca bit trong word.

Cc vng nh (Memory Areas ) trong CPM1

Channel Bit

CH000

CH001

CH002

15 14 13 12 11 10 09 08 07 06 05 04 03 00 01 02

0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 0

00000 00009 00006 00015

00100

00201

CH 000 CH 001 CH 002 CH 009 INPUT AREA

CH 010 CH 011 CH 012 CH 019 OUTPUT AREA

CH 200 CH 210 CH 211 CH 239 WORK AREA

SR 240 SR 255 SPECIAL REGISTERS

TR 0 TR 7TEMPORARY REGISTERS (Relays)

HR 00 HR 19 HOLDING REGISTERS (Relays)

AR 00 AR 15 AUXILLIARY REGISTERS (Relays)

LR 00 LR 15 LINK REGISTERS (Relays)

TIM 000 TIM 127 TIMER / COUNTER

DM 0000 DM 1023

DATA MEMORY Read / Write

DM 6144 DM 6599

DATA MEMORY Read Only

DM 6600 DM 6655

DATA MEMORY PLC Set up

9


Cc vng nh thng dng trong b CPM1

CH000-CH009 INPUT AREA (cc u vo) CH010 - CH019 OUTPUT AREA (Cc u ra) CH200 - CH239 WORK AREA (vng nh h tr dng t do) SR240 - SR255 SPECIAL REGISTERS TR0 - TR7 TEMPORARY REGISTERS (Relays) HR00 - HR19 HOLDING REGISTERS (Relays) AR00 - AR15 AUXILIARY REGISTERS (Relays) LR00 - LR15 LINK REGISTERS (Relays) TIM/CNT 000 - TIM/CNT 127 TIMER / COUNTER

( a ch dng bit v word ca timer v counter)

DM0000 - DM1023 DATA MEMORY READ / WRITE - Vng nh cho php c ghi

DM6144 - DM6599 DATA MEMORY READ ONLY - Vng nh ch cho php c

DM6600 - DM6655 DATA MEMORY PLC SETUP - Vng nh lu thit lp ca PLC

Vi b CPM1 Training kit, cc a ch bit trong word CH00 t Bit 00 n Bit 11 l cho cc u vo, cn trong word CH010 cc Bit 00 n Bit 7 l cho cc u ra. Khi vit trong chng trnh, cc a ch ny thng c vit di dng v d 000.01 (c du chm gia a ch ca word v s ca bit trong word) hoc 00001 (khng c du chm).

10

Hng dn t hc PLC CPM1 qua hnh nh Chng 3: Lp trnh bng Programming Console

Programming Console l 1 b bn ph m lp trnh cm tay cho PLC ca

OMRON dng ngn ng lp trnh dng dng lnh Mnemonic Code. N cng c dng c chng trnh trong b nh v thit lp cc ch hot ng ca PLC. B Programming Console s c ni vo cng Peripheral Port ca PLC dng cp i km, qua y Programming Console s nhn ngun nui t PLC, ng thi c th c ghi chng trnh trong PLC.

! 3.1 Khi u Khi mi ni Programming Console vi PLC, mn hnh ca Programming Console s hi Password trn mn hin th (Display)

nhp Pasword truy cp, bm nh sau :

PASSWORD!

00000 MONTR CLR CLR

PRO01

MONITOR PROGRAM RUN

FUN

CLR

NOT

CNT

TIM EM DM

TR

*EM LR

SFT SHIFT

AR HR

CONT #

CH *DM

LD OUT

OR AND

3 2

0

INS

Programming Console OMRONOMRONOMRONOMRON

1

EXT

WRITE

CHG SRCH

DEL SET

RESET

VER

MONTR

9 8 7

5 64 B C D

E

A

F

11


Sau khi bm nh vy ta s thy xut hin s 00000: y l s th t ca bc lp trnh u tin ca PLC. Nu bm tip ph m c hnh mi tn xung, ta s thy cc bc tip theo ca chng trnh c sn trong PLC. Ghi ch : Cc hnh mi tn ch biu th trnh t bm cc ph m trn Programming Console.

3.2 Cc ch hot ng ca PLC

Ta c th chuyn i ch ca PLC mt cch d dng bng cch xoay cha kho trn bn ph m. !!!! 3.3 Xo chng trnh trong PLC

1) Chuyn PLC sang ch Program mode

RUN MONITOR PROGRAM

2) Bm nt mn hnh hin th 00000

00000 3) Bm ln lt cc nt sau xo chng trnh tromg b nh PLC

! 3.4 V d v cch nhp 1 chng trnh

# Ch Program : L ch lp v sa chng trnh cho PLC. Chng trnh trong PLC s khng c thc hin ch ny

# Ch theo di Monitor L ch trong chng trnh trong PLC s c thc hin, ng thi cc a ch b nh trong PLC c th c t li trc tip t b lp trnh nh cc bit vo ra (I/O BITS), cc Timer, Counter, vng nh DM y l ch nn t khi mun sa chng trnh.

# Ch RUN (Run mode) L ch m chng trnh iu khin trong PLC c thc hin (chy) v ni dung bn trong PLC ch c th theo di ch khng th sa i t bn ngoi. y l ch nn t sau khi chng trnh c nhp v kim tra ng n

CLR

CLR

MONTR NOT SET RESET CLR

12


a ch Lnh v tham s 00000 LD 00000 00001 AND 00001 00002 OUT 01000 00003 LD 00002 00004 AND 00001 00005 OUT 01001 00006 END(01)

1. Ni Programming Console vi PLC v chuyn kho v v tr Program Mode. 2. 3. 4. 5. 6. 7. 8. Thao tc cui cng va ri l np lnh END (kt thc) vo chng trnh. Tt c cc chng trnh u phi kt thc bng lnh ny, nu khng c, PLC s bo li. Sau khi nhp xong, bm cc mi tn ln v xung kim tra chng trnh va nhp. chy chng trnh, chuyn kho chuyn trn Programming Console v v tr Run hoc Monitor.

! 3.5 Tm kim trong chng trnh (Search) Chc nng tm kim (Search) c dng tm kim nhanh 1 lnh hoc 1 a ch trong chng trnh. Sau ta c th thc hin cc thao tc nh xo lnh, sa lnh hay a ch. V d : Trong chng trnh di y c 2 lnh AND 00001 2 a ch khc nhau :

a ch Lnh 00000 LD 00000

CLR A

0 WRITE LD

OUT A 0

A

0 A

0 B

1 A

0 WRITE

FUN A

0 B

1 WRITE

AND B

1 WRITE

C

2 WRITE LD

B

1 WRITE AND

OUT A 0

B

1 A

0 B

1 A

0 WRITE

13


00001 AND 00001 00002 OUT 01000 00003 LD 00002 00004 AND 00001 00005 OUT 01001 00006 END(01)

tm n a ch lnh AND 0001 ny, thc hin nh sau : Mi ln bm ph m s a ta n ni gp lnh cn tm k tip.

3.6 Xo lnh (Delete)

xo lnh hin ang c hin th trn Display ca Programming Console, bm cc ph m sau :

Ch : Kho chuyn trn Programming Console phii c t v v tr Program mode

V d: Cn xo lnh LD 00002 trong chng trnh di y

a ch Lnh 00000 LD 00000 00001 AND 00001 00002 OUT 01000 00003 LD 00002 00004 AND 00001 00005 OUT 01001 00006 END(01)

1) Bm mi tn xung cho n khi gp lnh LD 00002

2) Bm ln lt xo lnh ny

Sau khi LD 00002 c xo, lnh bn di lnh ny l AND 00001 s c d ch ln a ch 00003 v chng trnh mi s l :

a ch Lnh 00000 LD 00000 00001 AND 00001 00002 OUT 01000 00003 AND 00001 00004 OUT 01001 00005 END(01)

CLR AND SRCH SRCH B

1

SRCH

DEL

DEL

14


3.7 Chn thm lnh (Insert)

Cc lnh mi c th c chn vo trn lnh ang c hin th trong chng trnh hin hnh.

V d Ta mun chn lnh OR 00002 vo gi lnh AND 00001 v OUT 01000 ca chng trnh sau :

a ch Lnh 00000 LD 00000 00001 AND 00001

OR 00002 00002 OUT 01000 00003 AND 00001 00004 OUT 01001 00005 END(01)

Trnh t thc hin :

1) Bm nt mi tn cho n khi mn hnh hin th OUT 01000 2) Nhp vo lnh OR 00002 nh bnh thng

3) Bm theo th t

3.8 Theo di cc hot ng ca PLC a- Theo di trng thi 1 tip im (1 bit) + + bit address + V d Theo di trng thi ca Channel 000 Bit 01

b- Bt tt cng bc cc bit (Forced Set / Reset)

Sau khi hin th v theo di trng thi bit CH010.00 bc trn, cng bc bt bit ny ln trng thi ON bm nt

cng bc bt bit ny v trng thi OFF bm nt

SHIFT

0000

00001 $ON MONTR

CLR

CONT #

B

1

INS

2 OR

SHIFT MONTR CONT #

RESET

SET

15


c- Theo di gi tr 1 word (Channel)

+ + Word cn

theo di + V d : theo di Channel 000

Trng thi tng bit trong word CH000 c th c theo di khi bm tip ph m Shift v MONTR: Cc bit trong Channel 000 hnh trn c biu din t phi qua tri, bit bn ohi ngoi cng l bit 0. Trng thi bt (ON) ca bit c biu th bng s 1 cn trng thi tt (OFF) c biu th bng s 0 Nu bt cc cng tc u vo s 1 v 2 ta s thy cc bit tng ng c bt trn Programming Console nh di y

d- Ghi gi tr mi vo word

SHIFT c0000 0000000000000000

c000 0000

MONTR

CLR c0000 0000000000000011

c000 0003

SHIFT MONTR CH *DM

SHIFT

00000

00000 CHANNEL 000

c000 0000

MONTR

CLR

A

0 CH

*DM

Gi tr ca word c ghi bn di a ch word cn theo di (c000)

16


Gi tr hin hnh ca word c th c ghi vo t Programming Console nh v d sau, channel 010 s c ghi gi tr mi l 000F khng ph thuc vo chng trnh hin hnh trong b nh PLC :

+

Ni chung cc a ch b nh u vo ra (IR) khng nn c ghi tr phi ang th nghim. Sau y l 1 v d ghi 1 gi tr mi vo word DM 1000

SHIFT

00000

c010 0000 MONTR

CLR

F

5

CH *DM

B

1

PRES VAL? c010 0000 ????

SHIFT WRITE

CHG

A

0

c010 000F

c010 000F

D1000 c010 0000 000F MONTR

EM DM

B

PRES VAL? D1000 0000 ????

WRITE

CHG

A

D1000 c010 1234 000F

A

D

A

E

B

C

1 0 0 0

1 2 3 4

[ 17 ]

Hng dn t hc PLC CPM1 qua hnh nh Chng 4: Lp trnh bng s bc thang Ladder Diagram

4. Lp trnh bng s bc thang Ladder Diagram Cc lnh c bn ca s bc thang (LADDER DIAGRAM)

! Thnh phn lun lun phi c trong s gi l power bus, l ni dn ngun in (tng tng) i vo v i ra s

4.1 LD Lnh LD ni vi power bus tri s khi u 1 network ca s Ladder Diagram. S ghi ph a trn k hiu lnh l a ch thng s ca lnh.

4.2 OUT Lnh OUT ging nh 1 r le chp hnh a ra kt qu logic ca cc

lnh i trc vo 1 tip im (bit) OUTPUT chng trnh trn kt qu logic ca lnh LD 00000 (tip im ng m) s iu khin u ra l tip im 01000. Khi nhp on chng trnh trn vo PLC, phi m bo ang ch Program Mode v cui chng trnh phi c lnh END.

LD 00000 OUT 01000 END (01) + Sau chuyn sang ch Monitor hoc RUN chy. Bt th cng tc 00000 s khin u ra 01000 cng bt sng.

# chng trnh sau, khi bt cng tc 00000 (cng tc th nht trn b Training CPM1), u ra CH010.00 s c bt ln ON.

00000 LD 00000

00000 01000

LD 00000 OUT 01000

0 1 FUN

00000 01000

END(01)

[ 18 ]


4.3 AND

Lnh AND s to ra 1 logic ging nh hnh di y :

+

-

v d trn, vic ni tip 2 iu kin logic A v B s i hi c A v B u tc ng (ng) th n C u ra mi sng. Di y l 1 Ladder Diagram c dng lnh AND.

Lc ny, khi bt cng tc CH000.00 ng thi bt cng tc CH000.01

th n u ra Output 010.00 mi sng. 4.4 OR

Lnh OR s to ra 1 logic ging nh hnh di y

00000 01000

END(01)

00001 LD 00000 AND 00001 OUT 01000 END(01)

00000 01000

END(01)

00001 LD 00000 AND 00001 OUT 01000 END(01)

$ $

A B $ $

C

$ $

A

B

$ $

C + -

[ 19 ]


v d trn, vic ni song 2 iu kin logic A v B s ch i hi hoc A hoc B tc ng (ng) th n C u ra s sng. Di y l 1 Ladder Diagram c dng lnh OR.

Lc ny, khi bt cng tc CH000.00 th n u ra Output 010.00 s sng.

Hoc khi bt cng tc CH000.01 th n u ra Output 010.00 s sng.

Hoc khi bt cng tc CH000.00 ng thi bt cng tc CH000.01 th n u ra Output 010.00 cng s sng.

4.5 AND LD

00000 01000

END(01)

00001

LD 00000 OR 00001 OUT 01000 END(01)

00000 01000

END(01)

00001

LD 00000 OR 00001 OUT 01000 END(01)

00000 01000

END(01)

00001

LD 00000 OR 00001 OUT 01000 END(01)

00001

00000 01000

END(01)

LD 00000 OR 00001 OUT 01000 END(01)

[ 20 ]


Lnh AND LD c dng xy dng cc khi logic phc tp hn bng cch ghp chng ni tip vi nhau.

Gi s ta c 1 on chng trnh nh di y, trong u ra 01000 s bt khi u vo 00000 hoc 00001 V 00002 bt.

Nu by gi iu kin trn c thm u vo 00003 nh di y :

Vic nhp vo on chng trnh ny i hi phi chia n ra lm 2 khi ni tip nhau

Sau nhp vo ring r cc lnh cho tng khi v ni 2 khi li vi

nhau bng lnh AND LD

4.6 OR LD

00000 01000

END(01)

LD 00000 OR 00001 AND 00002 OUT 01000 END(01)

00001

00002

00000 01000

00001

00002

00003

00000 01000

00001

00002

00003

LD 00000 OR 00001 LD 00002 OR 00003 AND LD END(01)

00000 01000

00001

00002

00003

AND LD

LD 00000 OR 00001

LD 00000 OR 00001

[ 21 ]


Lnh OR LD c dng xy dng cc khi logic bng cch ghp chng song song vi nhau.

Gi s ta c 1 on chng trnh nh di y, trong u ra 01000 s bt khi u vo 00000 v 00001 hoc 00002 bt.

Nu by gi iu kin trn c thm u vo 00003 nh di y :

nhp vo on chng trnh ny ta phi chia n ra lm 2 khi con ni song song vi nhau nh di y : V d kt hp lnh AND LD v OR LD :

00000

LD 00000 AND 00001 OR 00002 OUT 01000

01000 00001

00002

00003 01000

00001

00002

00000

00000

00003 00002

01000 00001

LD 00000 AND 00001

00002

01000 00001

00003

00000

LD 00002 AND 00003

LD 00000 AND 00001 LD 00002 AND 00003 OR LD OUT 01000 END(01)

OR LD

[ 22 ]


Trnh t thc hin cng phi chia thnh cc khi con v g ring r tng khi vo, sau dng lnh AND LD v OR LD nhp cc khi li vi nhau.

.4.7 AND NOT Lnh AND NOT to ra 1 tip im thng ng (ngc vi lnh AND)

Khi i lnh AND 00001 thnh AND NOT 00001 nh s trn, u ra

CH010.00 s bt khi CH000.00 l ON v CH000.01 l OFF.

4.8 LD NOT

00000 01000

00001

00002

00003 00004

LD 00000 AND NOT 00001 OUT 01000 END(01)

00000 01000

00001

LD 00000

LD 00001 OR 00002

LD 00000 LD 00001 OR 00002 AND LD

LD 00003 AND 00004

00000 01000

00001

00002

00003 00004

LD 00000 LD 00001 OR 00002 AND LD LD 00003 AND 00004 OR LD OUT 01000 END(01)

OR LD

[ 23 ]


Lnh LD NOT to ra 1 tip im thng ng u ca on mch (ngc vi lnh LD)

4.9 NETWORK % 1 Network c to thnh bi cc lnh LOAD, AND, OR v OUT % Tr phi dng to cc khi logic ni vi nhau bng lnh AND LD

hoc OR LD, lnh LOAD s c dng to 1 Network mi.

4.10 Mch cht (t gi) - LATCHING /SELF HOLDING CIRCUIT

Di y l 1 s Ladder Diagram ca 1 mch t gi rt ph bin trong lp trnh:

LD NOT 00000 AND 00001 OUT 01000 END(01)

00000 01000

00001

00000 00001

01000 01000

00000 Network I

00002

00001 01000

Network II

LD 00000 OR 00002 AND 00001 OUT 01000 LD 00003 OR 00005 AND 00004 OUT 01001

00003 00004

01001 00005 *

Ch th t: AND 00005 phi l OR 00005 OR 00004 AND 00004

[ 24 ]


Khi bt switch CH000.00, u ra CH010.00 s bt v gi trng thi ny bt k sau switch 00000 c cn bt hay khng. CH010.00 s b tt khi switch 00001 bt.

4.11 Cc quy tc chung ca s LADDER DIAGRAM

1) Nu mun u ra lun ON, phi ni u ra ny qua 1 c (Flag) l Bit 25313 (tc Channel 253 Bit 13). Bit ny l 1 c h thng lun lun trng thi ON.

on mch sau l sai v u ra khng ni qua 1 tip im :

2) C th ni song song nhiu tip im dng lnh OR hoc song song

nhiu u ra dng lnh OUT/OUT NOT v dng bit u vo nhiu ln

01000 OUT 01000 END(01)

01000 LD 25313 OUT 01000 END(01)

25313

00002

00000 00001

00000 01001

01000 00001

[ 25 ]


3) Nu c 2 lnh Output cho cng 1 a ch bit, lnh output trc s khng

c tc dng

on chng trnh trn c sa li nh sau

4) 1 on mch c th c nhiu lnh OUT ni song song nhau

01000 LD 00000 OUT 01000 LD 00001 OUT 01000 END(01)

00000

01000 00001

01000 LD 00000 OR 00001 OUT 01000 END(01)

00000

00001

01000 LD 00000 AND 00001 OR 00002 OUT 01000 OUT 01001 OUT 01002 END(01)

00000 00001

00002 01001

01002

[ 26 ]

Hng dn t hc PLC CPM1 qua hnh nh Chng 5: Cc lnh ph bin khc trong lp trnh

5. Mt s lnh lp trnh ph bin khc ca PLC OMRON

5.1 B nh thi - TIMER

n v = 0.1 giy SV = 0000 - 9999 000.0 - 999.9 giy SV = 0100 0100 x 0.1 = 10 giy SV = 9999 9999 x 0.1 = 999.9 giy

V d 1 Timer c set value = 100x0,1=10 giy Khi bt kho CH000.00 ln, Timer s 000 s bt u m thi gian, khi 10 giy tri qua, tip im ca Timer l TIM 000 c bt ln ON v lm u ra CH010.00 cng c bt ln ON. Timer cng s b reset v gi tr t khi u vo 00000 tt (OFF) V d 2 Timer c set value c lu trong thanh ghi DM 0000

B Timer ny c thi gian t c lu trong DM 0000. PLC s ly gi

tr trong DM 0000 lm gi tr t cho timer. Gi s ni dung ca DM0000 l 150. Khi bt kho CH000.00 ln, Timer s 000 s bt u m thi gian, khi 15 giy (150x0,1=15) tri qua, tip im ca Timer l TIM 000 c bt ln ON v lm u ra CH010.00 cng c bt ln ON.

N : S ca Timer

000 - 127

# (Hng s) , IR , SR, AR, DM, HR, LR

SV : set value

TIM N

SV

01000

LD 00000 TIM 000

#0100 LD TIM 000 OUT 01000 END(01)

00000

TIM 000

TIM 000 # 0100

01000

LD 00000 TIM 000 DM 0000 LD TIM 000 OUT 01000 END(01)

00000

TIM 000

TIM 000 DM 0000

[ 27 ]


5.2 B m COUNTER

Lc khi u gi tr hin hnh ca b m c bt u ti SV. B m s gim gi tr hin hnh ca n (CNT N) i 1 n v mi ln c sn ln xung u vo CP v c bo hon thhh CNT N s bt khi gi tr hin hnh ca b m gim v 0. B m s b reset v gi tr t SV khi c sn ln ca u vo R.

V d Counter s 0 c gi tr t l 10

Mi ln bt kho CH000.00, gi tr ca Counter 000 gim i 1. Khi bt kho CH000.00 10 ln th c bo CNT000 bt ln ON v do cng bt u ra CH010.00 ln ON. B m s b reset khi bt switch CH000.01

! M rng kh nng ca TIMER

9999 X 0.1 = 999.9 giy = 0.278 gi

CP

R

CNT N

SV

CP

R

CNT N

SV

CP

R

CNT N

SV

01000

LD 00000 LD 00001 CNT 000

# 0010 LD CNT 000 OUT 01000 END(01)

00000

CNT 000

CNT 000 # 0010

COUNTER = 10

00001

TIM 000

#9999

N : S ca Counter

000 - 127

# (Hng s) , IR , SR, AR, DM, HR, LR

SV : set value

[ 28 ]


Do thi gian t ti a ca timer l 0,278 gi nn tng thi gian m ca timer, ta c th dng kt hp vi Counter nh sau :

V d M rng thi gian t ln 10 gi

V d ng dng Trong v d ny ta s lp trnh PLC cho cng on ng gi sn phm vo bao b. y l cng on rt hay gp trong cc dy chuyn sn xut. Trn hnh, ta thy cc sn phm hon thin c bng truyn chuyn ti thit b ng bao. C 5 sn phm ng vo 1 bao. C 1 cm bin quang in lm nhim v pht hin sn phm trn bng truyn v gi t n hiu xung v b m trong PLC. Mi khi m 5 sn phm, b m gi t n hiu ra cho cun ht solenoid lm vic, y 5 sn phm vo bao b. Thi gian cun ht lm vic l 2 giy. Trong thi gian cun ht hot ng, bng truyn ngng chy.

01000

= 360 giy = 0.1 gi

00000

CNT 001

TIM 000 # 3600

3600 X 0.1

00001 0.1 gi X 100 = 10 gi

TIM 000

CNT 001 # 0100

TIM 000

Cun ht y sn phm vo bao

Solenoid Sensor

Bng truyn

# #

Solenoid

Cun ht cha k ch

hot

Bao rng

Bao y

[ 29 ]


Trng hp ny, ta c 1 u vo duy nht l t n hiu xung t cm bin, t l bit 00. 2 u ra s l t n hiu gi n cun ht, t l 1001, v t n hiu ngng bng truyn, t l 1000.

a ch Thit b vo a ch Thit b ra 00000 Sensor 01000 Bng truyn 01001 Cun ht

Solenoid a ch Lnh khc CNT 000 B m sn phm TIM 001 B nh thi gian k ch hot cun

ht Chng trnh cn lp s nh trn s di y :

Bnh thng khi cun ht khng lm vic, bng truyn chy nh c tip im thng ng 1001 trng thi OFF. Lc ny cm bin s gi t n hiu xung v PLC mi khi c sn phm i qua v u vo ny c dng lm u vo m ca b m CNT 0. Khi c 5 sn phm, tip im CNT 0 s ng, reset counter v gi tr ban u l 5, ng thi gi t n hiu cho cun ht v timer lm vic trong mch t gi. Lc ny, bng truyn cng ngng chy do tip im 1001 ngt mch hot ng ca u ra 1000. Sau 2 giy, tip im TIM 001 s ngt ngun hot ng ca cun ht v bng truyn tip tc chy, lp li chu trnh. Ch : Lnh END cui chng trnh ch nh du vic kt thc chu trnh lm vic hin hnh ca PLC v bt u chu trnh mi t lnh u tin ca chng trnh. N khng c ngha l chng trnh s dng. Chng trnh ch dng khi ta chuyn ch sang PROGRAM MODE hoc khi c s c nghim trng bn trong PLC.

01001

00000

CNT 000 # 0005

LD 00000 LD CNT 000 CNT 000

#0005 LD CNT 000 OR 01001 AND NOT TIM 001 OUT 01001 TIM 001 #0020 LD NOT 01001 OUT 01000 END(01)

01001 TIM 001 # 0020

TIM 001 Solenoid

CNT 000

CNT 000

01001 01000

END(01)

Bng truyn
( B CPM1 dnh cho vic o to th nghim - CPM1 Training Kit1.1 B CPM1 chun (B hng dn t hc CPM1 trong phng th nghim)1.2 B CPM1 thu gn (B hng dn t hc CPM1 xch tay - CPM1 Laptop Training Kit)(Cc model trong h CPM 1(Cu trc c bn ca b iu khin logic lp trnh PLC (Programmable Logic Controller)2.1 Cc h m (Number System)(Cch biu din cc i lng bn trong PLC2.2 Cu trc c bn ca PLC OMRON3.2 Cc ch hot ng ca PLCa ch000000000100002a chLD 000003.6 Xo lnh (Delete)a chLDa chOUT3.7 Chn thm lnh (Insert)a chAND 00001OUT 010013.8 Theo di cc hot ng ca PLC4. Lp trnh bng s bc thang Ladder Diagram5. Mt s lnh lp trnh ph bin khc ca PLC OMRONV d ng dng

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