6SN1123-1AA00-0CA1

6SN1123-1AA00-0CA1

6SN1123-1AA00-0CA1

6SN1123-1AA00-0CA1

6SN1123-1AA00-0CA1

6SN1123-1AA00-0CA1

PLC的工作速度要快。速度快、執行指令時間短，是PLC實現控制的基礎。事實上，它的速度是很快的，執行一條指令，多的幾微秒、幾十微秒，少的才零點幾，或零點零幾微秒。而且這個速度還在不斷提高中。
圖1－1－1所示的過程是簡化的過程，實際的 PLC工作過程還要復雜些。除了 I/O刷新及運行用戶程序，還要做些公共處理工作。 
公共處理工作有：循環時間監控、外設服務及通訊處理等。
監控循環時間的目的是避免"死循環"，避免程序不能反復不斷地重復執行。辦法是用"看門狗"（Watching dog）。只要循環超時，它可報警，或作相應處理.

SQUARE D FAL340801021 80AMP CIRCUIT BREAKER $899.99

NEW Square D KAL KAL362501380 250 amp 3 pole Breaker


Square D PQ4620G Fusable I-Line Busway Switch 200A S6

Square D PQ-4220 Fusable I-Line Busway Switch 200A S6

SQUARE D PAF362000Z CIRCUIT BREAKER 1600 AMP TRIP 

SQUARE D CH362AWK HEAVY DUTY SAFETY SWITCH *NEW*


Square D I-Line Panel Board Box HCN-1445-4M 400 Amp Main

Square D 8539 SBG43 Comb. Starter W/ Disconnect 


Square D 8539 SBG43 Comb.Starter W/ Disconnect & Lamp


SQUARE D CIRCUIT BREAKER CAT#LCL36600 600A 600V 3 POLE

SQUARE D CIRCUIT BREAKER CAT#LCL364506168 450A/600V/3POLE

Square D H365 Switch Fusible 400Amp

Square D Generator Transfer Switch 200 Amp 2 Pole Cat. No. 82254

Square D Sorgel 15T6H 3 Phase Transformer 15KVA PRI-480V SEC-240V Great Cond

SQUARE D HCP23598 I-LINE PANELBOARD 800AMP $899.99

SQUARE D CIRCUIT BREAKER CAT#LAL364008041 400A 600V 3 POLE *NIB*

SQUARE D FUSED 200 AMP SAFETY SWITCH 240 VAC 15 HP MODEL No. 82354


SQUARE D CIRCUIT BREAKER LI CAT#LI36600 600 AMP 600 VOLT 3 POLE 3 PHASE

Square D 1000A Automatic Molded Case Switch MHL36000M

square d jgp36225yl jgp 225 circuit amp 3 pole breaker


Square D 37S3H 37.5 kVA 1 ph transformer pri 480/240- sec 240/120 Tested!

Square D Motor Starter 8536SF01S Contactor Size 4 A 


Square D KHL KHL3625025DC2144 250a 3 pole 600v Breaker


Square D 8539 SDW Industrial Magnetic Motor Starter NIB


SQUARE D FUSIBLE DISCONNECT SWITCH QMB366W 600 AMP 3P 600V SERIES E2


New Square D I line Power Pact QDA32200 200 amp breaker


Square D H222DS Heavy Duty Safety Switch 240V 60A


NOS SQUARE D MAIN CONTROL BOARD 52011-038-52 5201103852


Square D Fusible Safety Switch H366 600A /600V

Square D PFCD4030F Power Factor Correction Capacitor 480V 3PH 30KVAR


SQUARE D 7S1F USPP 7S1F

SQUARE D CIRCUIT BREAKER (KHL36150) "NEW SURPLUS"

Square D Schneider Masterpact NT08HF 50/60Hz

Square D Weld Control Module RMWC3844 #25972

SL800 SQUARE D
SUB FEED LUG

NEW SQUARE D 100 AMP PANELBOARD CAT# NEHB1MW, NEHB18429

VERY NICE SQUARE D 800 AMP CIRCUIT BREAKER MODEL MAP36800

Square D I Line Panelboard HCM 2364-6 600 Amp 600 V Type 1 Enclosure MLO


Square D I Line Panelboard HCM 50T4-6 600 Amp MLO Type 1 Enclosure 600 V


Square D I Line Panelboard HCM5074-6 600 Amp 600 V MLO Type 1 Enclosure


SQUARE D 9070EO81D101E23 TRANSFORMER 1.3KVA/0.15KVA ***NNB***

NEW Square D Disconnect HU365R 600V 3P 400A

Square D H364NDS 3R Raintight 200 Amps 600 volt Fusible Safety Switch Disconnect


Square D Passport TBXDMS16C222 I/O PLC System TBX CBS010 TBXDMS16C222 *Tested*

4 nos Square D FH36070 Thermal magnetic/ molded Case Circuit Breaker 70A $$$ HQ!

Square D Motor Starter 8536-SG01, Form S, Series A, 600 VAC #34940

800 Amp Square D Molded Case Circuit Breaker MAP36800


Square D Weld Control Module 8994 SYS80 #25968

square d H362DS stainless steel safety switch disconnect 30 amp 4x 600v


Square D Weld Control Module 8994 SYS80 Rev B f#25970

Square D Weld Control Module 8994 SYS80 #25973

Square D MEL36800LS Electronic Trip circuit breaker ARP075 plug

Used Square D MHL364001386 shunt trip aux switch 400 amp breaker 

SQUARE D SYMAX 8030 ROM122 REV,1 SER, E 8030-ROM-122 8030ROM122

Square D MHL3645025DCI679 450Amp Circuit Breaker C-PICS


SCHNEIDER 140EHC20200 High Speed Modicon Counter NIB SQUARE D


Square D 9070 SK1000G1 9070SK1000G1 Disconnect - Used


SQUARE D H361NDS USPP H361NDS

Square D MHP MHP36500 500 amp 600V 3 pole Breaker


Square D Lighting Panelboard 8903 100 Amp Contactor


Square D 8803 P00C04H 10HP 460VAC Drive 8803P00C04H **XLNT** POOCO4H **XLNT**


Square D 600V Panel Board HCM1448-4 Series E1

SQUARE D LE36400LI 400 AMP 600V 3 POLE BREAKER Q-85


SQUARE D 52011-040-50 ISOLATED SIG BOARD CONTROL*

MAL36600 SQUARE D Circuit Breaker 600A 600V MAL 3P TESTED


MAL26600 SQUARE D Circuit Breaker 600A 600V MAL 2P CLEANED & TESTED


Square D LE36300LI Breakers 300 Amp I-Line 65 kAIR 100%


Square D Enclosure 400 Amp Disconnect Non-Fusible Type 3R Rainproof NEW

Square D I Line Panelboard HCW 3262-6 600 Amp 600 V Type 1 Enclosure MLO


SQUARE D 9998-SL11 NEMA size 5 contact kit 3 pole 8502 & 8536 Starter Contactors


LC36300 SQD SQUARE D Circuit Breaker 3P 300A 600V 65K AIC I-Line


Square D SGO1V02 AC Magnetic NEMA Rated Starter

SQUARE D H362DSVW | Stainless Steel 60A Safety Disconnect Switch *NIB*


Vent-Rite MEPCO Guardian Condensate Return Protector Pump PC6N 57412 Square D 

New Square D 9998 SL11 OEM Contact Kit For Size 5 

Square D NQOD436M600SFB Main Breaker Panel Board 600 Amp 208 Y/120 V


Square D KHL362001121 Circuit Breaker, 125 A, UVR, NEW!


S48382 Square D 2 Programmable Contact Modules Drawout Merlin Gerin # 47086 NEW


SQUARE D FH36090 90 AMP CIRCUIT BREAKER

PQ4210G Square D I-Line Bus Plug 100A 4W Fusible NEW 


Square D MHL368001386 Breaker, 800 Amp, 65 kAIR


PFA34030G Square D Breaker Type Bus Plug PFA 30A 3W NEW


SQUARE D 800 AMP BUSWAY TAP BOX CF2508GETBMB 

NEW Square D Powerlogic PM750 Power Meter

SQUARE D LHL36000M CIRCUIT 400.00 AMP 600 VOLT 3 POLE

SQD SQUARE D Circuit Breaker LC36400 3P 400A 600V 65K


SQUARE D 8702-SDO2-V02S NSPP 8702SDO2V02S

SQUARE D LHL36000M8041 USPP LHL36000M8041

Square D 8736SCG8V02S 8736SCG8-V02S Ac Reversing Starter


Square D 8736SCG8V02S 8736SCG8-V02S Ac Reversing Starter


SQUARE D JDA36225 NSFP JDA36225

SQUARE D 8539-SBG43-V06 USPP 8539SBG43V06

FCP34100MT NEW SQUARE D FCP 34100 MT FREE SHIPPING


1 NEW SQUARE D 9050PMDH-11AAV20 TIMER COUNTER NIB

SQUARE D KLCUL35-A1 USPP KLCUL35A1

SQUARE D GROUND FAULT SENSOR GT-912


Square D KAL361751021


New Square D D-325-NR General Duty Safety Switch - 400Amp - Rainproof

H362RB SQUARE D


SQUARE D LAP36400MB USPP LAP36400MB

SQUARE D 8903-SQG1-1V02 USPP 8903SQG11V02

SQUARE D 9070-SK1000G2D1G16P1 NSFP 9070SK1000G2D1G1

Square D JJA36175 Circuit Breaker, 175 Amp 65 kAIR NEW