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下面将介绍一个交通信号灯的控制电路。

【例】用PLC构成交通灯控制系统。

（1）控制要求：如图1所示，起动后，南北红灯亮并维持25s。在南北红灯亮的同时，东西绿灯也亮，1s后，东西车灯即甲亮。到20s时，东西绿灯闪亮，3s后熄灭，在东西绿灯熄灭后东西黄灯亮，同时甲灭。黄灯亮2s后灭东西红灯亮。与此同时，南北红灯灭，南北绿灯亮。1s后，南北车灯即乙亮。南北绿灯亮了25s后闪亮，3s后熄灭，同时乙灭，黄灯亮2s后熄灭，南北红灯亮，东西绿灯亮，循环。

SQUARE D CIRCUIT BREAKER 3P 1000 AMP 600V NXL361000G NXL361200G




PERFECT SQUARE D MICROLOGIC NX361000G NX361200G W/ L,S,I,G ELECTRONIC TRIP


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Square D 8020 SCP-631




SQUARE D MAL3660042M1021 USPP MAL3660042M1021


Square D HCW5080-8 800 amp I Line CIrcuit Breaker Panel


2.20 carat D/SI1 SQUARE PRINCESS CUT DIAMOND ENGAGEMENT RING / SHIREE ODIZ




Square D NA361200 Main Circuit Breaker I-Line Panelboard - E206


SQUARE D SWITCHBOARD ENCLOSURE NEMA TYPE 3R 1600AMP LRG CABINET


Square D NC361000 Main Circuit Breaker, 277/480 Volt I Line Panelboard # E211


SQD Square D PTB308 800 Amp Tap Box


Square D, I Line Panelboard complete, 1000A Main Breaker, 86" for breakers, NEW


NEW SQUARE D NW20H1 MASTERPACT CURCIUT BREAKER WA4FFR44A3S 2000 AMP NW 20 H1


SQUARE D 8839-58ELG4VW NSFP 883958ELG4VW


SQUARED D AIR BREAKER DS-632 DS632 3200A 3200A AMP AMPTECTOR I-A MODEL LSG


Square D Pertron Controls RS232 Data Panel #22753


Square D PowerPact RL 2500 RLF 36250 U43A 2500 Amp LSI With Test Report Manual




NAP361000 Square D Circuit Breaker NAL361000 NAP 1000A




SQUARE D S164A NSFP S164A


Square D **34100U64AE1 Breaker, 1000 Amp, 100 kAIR, I-Line, NEW!




PJF36060CU43A SQUARE D Circuit Breaker 600A ** 65K 




SQUARE-D SEDG25 2500A CIRCUIT BREAKER W/ S925LIG Trip


SQD Square D PKI34200GN 200 Amp Circuit Breaker Bus Plug


New Square D Circuit Breaker LIL36350 350 Amp 200K Feed Thur 


SQUARE D 8702-SFO3-V02-S USPP 8702SFO3V02S


SQUARE D HCR548612U NSFP HCR548612U


SQUARE D MHP3-6400 USPP MHP36400


Square D PowerPact RJF36200U44ASA 2000 Amp 600V LSIG 100-130v shunt RJF36200U44A


Square D BLO34160 Bolt Loc 1600 Amp 480 Volt Bolted Pressure Contact Switch


Square D BLO34160 Bolt Loc 1600 Amp 480 Volt Bolted Pressure Contact Switch


NEW Square D QED Deadfront Switchboard 400amp Main Lug QED2 QMB style


Square D Power Pact MJ800 MJP36800 Circuit Breaker 


Square D 1200Amp Bolt-Loc NEMA 1 Switchgear w/ 1200 Amp Fuses


SQ D AUTO TRANSFORMER, 450 KVA, 3 PHASE, 480 VOLT INPUT


Square D PJA36040U44AYP circuit breaker with warranty ( PJA36400 PJA360040 )


NEMA SIZE 5 SOFT-START SQUARE D MOTOR STARTER


SQUARE D PAF361200DC1625 SQD PAF361200 NEW IN THE BOX DC RATED


QMB368W Square D 3p 600v 1200a Fusible Panel Board Switch Series E1 NICE RECON


Square D Transformer 300T6H-CT #37891


SQUARE D 500 KVA TRANSFORMER PRI 480V SEC 208Y/120 3 PH DRY TYPE 500T68H


Square D PowerPact RJF36160U43H 1600 Amp Circuit Breaker


USED SOLID STATE CIRCUIT BREAKER SQD PEF2036LSIG 2000A SENSOR W/PE201800RP


SQ D 150 KVA / 4160V DRY TRANSFORMER


Square D MasterPact NW 16 H1 1600 Amp LSIG With 1600 Amp Plug




Square D RKF36120U44A PowerPact RK1200 1200 Amp 3 Pole Circuit Breaker LSIG




SQ-D # 1271801236 / MHL36700-3901 / MHL36700 NEW


Used Square D 150 KVA 12,000-208Y/120 3 Phase Transformer


SQUARE D FUSED QMB BRANCH SWITCH 1200 AMP 600 VAC SERIES E1 MODEL QMB368W 


Square D NO93T104HFCUDIT 93KVA Watchdog Transformer


Square D 5kV, 200A, fused outdoor switch






SQUARE D MHL3670035DC2351 USPP MHL3670035DC2351


PERFECT SQUARE D MICROLOGIC ME36800LSG W/ L,S,I,G FUNCTIONS ELECTRONIC TRIP


Square D NCP361200 NCP 1200 Amp A 1200A 600vac 1200Amp


Square D PJL36120CU44ASA Circuit Breaker, 1200 Amp, **, 65 kAIR, NEW




SQUARE D 8803-P00CO4M USPP 8803P00CO4M


PJA36080U64AE1YV SQUARE D Powerpact Circuit Breaker PJA 800A 3P 600V I-Line 65K




Square D 8030 CRM-565




SQUARE D 8839-58EFG4VY NSFP 883958EFG4VY


Square D Micrologic ME36300LI circuit breaker 300 amp rating plug 600VAC




Square D MCC Main Disconnect 2000A


SQUARE D 8839-58EGG4VW NSFP 883958EGG4VW


SQUARE D HCM1873-5M USPP HCM18735M


Square D PowerPact RJF36160U31A 1600 Amp 600 V LI Circuit Breaker




BREAKER 1600AMP SQUARE D POWERPACT RK1600 RFK3616OU44AAAYP MOLDED CASE


SQD Square D MHL361000 Circuit Breaker 


SQUARE D QED POWERSTYLE SWITCHBOARD WITH 2000 AMP PAF2036 BREAKER 3PHASE 4 WIRE 
INCLUDES MAIN AND DOUBLE ROW DISTRIBUTION SWITCHBOARD


SQUARE D MJA36700 NEW MLD CASE CIRCUIT BREAKER 700 AMP 3 POLE 600 VAC


SQUARE D MJA36800 NEW MLD CASE CIRCUIT BREAKER 800 AMP 3 POLE 600 VAC


Square D/Symax 8030-RIM-126


SQUARE D 300T3H USPP 300T3H


SQUARE D CF2308G8STM NSPP CF2308G8STM


Square D Surgelogic FC4IMA16C Surge Protective Device


SQUARE D 8538S-EG33V8-1CFF4H30P1TX11 NSFP 8538SEG33V81CFF4


SQUARE D CM4000 NSPP CM4000


SQUARE D CIRCUIT BREAKER (PHF362000) "NEW SURPLUS" 


SQUARE D ME36800LS USPP ME36800LS


SQUARE D 8803-P00C04P USPP 8803P00C04P


SQD Square D LI36400 Current Limiting Circuit Breaker


LOT OF 5 SQUARE D ALUMINUM BUS DUCT AP502G10 225 AMP 600 VOLT 10' LENGTHS


Square D PGA36080CU43A


Square D PJA36080CU41A


Square D I Line PowerPact Breaker PGA36080 U44AYK 800A A 600V 800 Amp LSIG NCT


Square D Var-Gard Automatic Power Factor Control Equipment - 250KVAR 480Volt 3W


Square D 225kVA transformer 480-208/120 


SQUARE D PANEL MOUNT SWITCH 800 AMP 600V 3P QMB3680


SQUARE D CIRCUIT BREAKER 800 AMP 600V 3 POLE MEF36800LI




SQUARE D CIRCUIT BREAKER 2000 AMP 600V 3 POLE PHF2036




SQUARE D CIRCUIT BREAKER 1200AMP MAL361200 NEW MAL361200


Square D NCP361200 NCP 1200 Amp A 1200A 600vac 1200Amp


Schneider Electric- JLL36250 -250A 600V Circuit Breaker


SQUARE D I LINE II TAP BOX CAT#AF231GETBMB 1350A 600V 3 PHASE 3 WIRE *NEW*


Merlin Gerin Circuit Breaker Square D MasterPact MP30H1 3000A 3000 Amp Switch MP


Square D PHF3616001f74 phf phf361600 phf36 breaker phf




new Square D pl 1000 plf34100u33 plf 1000 amp breaker




Square D UTS3 Universal Test Set Circuit Breaker Kit Micrologic CBTMT CBTMB 
@Series B@Secondary Injection Test Kit@90 Day Warranty@


Square D 3Ph 220 KVA Transformer HV 460 vac + taps LV 460Y/265 Cat# 220T105HDIT 


SQUARE D POWERPACT CIRCUIT BREAKER MGL36800 NEW & SEALED MGL36800


Square D 8020 SMM-710




SQUARE D PM870RD NSFP PM870RD


Schneider Electric Square D Telemecanique Altivar 5 ATV452VD11N Serie 45 2
Square D/Symax 8030-SCP-444


PJL36080M68 Square D PowerPact Circuit Breaker PJL 600V 800A Magnetic only NEW




Square D PCF362500 2500 Amp Circuit Breaker PCL PCF 362500 2500A PCF362500DC1680




1 NIB SQUARE D PGA36080U33A 800 AMP 3P 600VAC I-LINE CIRCUIT BREAKER POWER PACT


S174A Square D Micrologic Powerpact 6.0H Programmer Circuit Breaker New




Square D MEL36800LSG 800A Breaker ARP075 600 Amp Trip LSIG MEL36800LSG ALAM




SQUARE D CIRCUIT BREAKER PJD36000S10AB PJ 1000 powerpac




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MHL36100040DC1680 Square D Circuit Breaker 1000A 3P 600V MHL Bolt-On UPS BREAKER




PGA36100 Square D 3P 600V 1000A PG 1000 I-Line Circuit Breaker NEW 




New Square D 8536 size 5 AC Magnetic Starter w/ enclosure - 8536-SGO1




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Square D NW16H1 1600amp Masterpact