140DDI35300
140DDI35300
140DDI35300
从PLC控制系统与电器控制系统比较可知，PLC的用户程序（软件）代替了继电器控制电路（硬件）。因此，对于使用者来说，可以将PLC等效成是许许多多各种各样的“软继电器”和“软接线”的集合，而用户程序就是用“软接线”将“软继电器”及其“触点”按一定要求连接起来的“控制电路”。
为了更好的理解这种等效关系，下面通过一个例子来说明。如图1所示为三相异步电动机单向起动运行的电器控制系统。其中，由输入设备SB1、SB2、FR的触点构成系统的输入部分，由输出设备KM构成系统的输出部分。
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ASEA Brown Boveri, ABB DSMB 124
ABB Industrial Computer M10C7133232TWFWX131 #11416
ABB Servo Control Card YYT102B YT212001-AD/7 #10939
ABB CDP312P Operator Panel 4 ACS800 Inverter Free Ship
ABB Bailey INFI 90 NTPL01 Plant Loop Termination Unit
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New Lot of 2 ABB GJR 540 0100 R0001 System Cables
ABB Control Card USART86-8CH #10542-43
ABB PHILIPS YB560103-AN MODULE DSQC211
ABB Taylor Electronics Field Bus Controller
ABB YT213001-BC/2 MODULE 26681848061 YT213001BC2
NEW ABB CONTACT KIT ZL95 SET
ABB 6011BZ10001B VIDEO MODULE PCB
New ABB Bailey Infi 90 Redundancy Cable NKMP01-2
ASEA Brown Boveri, ABB YYT 102C
ABB TAYLOR MOD 300 MODULE 24/48 VDC 16 SRC 6240BP10811
ASEA Brown Boveri, ABB YYT 102C
ABB Network Interface Module 125VDC/120VAC 510N1140
ASEA Brown Boveri, ABB YYT 102C
ASEA Brown Boveri, ABB YYT 102C
ASEA Brown Boveri, ABB YTEA 250 -8
ASEA Brown Boveri, ABB YYT 102C
NEW ABB ZL110 CONTACT KIT
ASEA Brown Boveri, ABB YTEA 250 -8
ASEA Brown Boveri, ABB YYT 102C
ASEA Brown Boveri, ABB YTEA 250 -8
ASEA Brown Boveri, ABB YYT 102C
ABB KENT TAYLOR MOD 30 CONTROLLER 1701RZ14003D
ABB ACS500, ASC501-015-4-00P2, AC DRIVE
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ABB ACS500 AC MOTOR DRIVE 15HP CONSTANT TORQUE 3 PHASE
ABB V17151-420 Contrans I Interface Module V17151420
ABB YYT 102F SERVO CONTROL CARD CIRCUIT BOARD YYT102F
NEW ABB 6228BZ10000D MULTIBUS SC D/F
ABB TA25 DU OVERLOAD RELAYS 13-19AMP (LOT OF 2)**XLNT**
ABB TAYLOR MOD 300 HIGH SPEED COUNTER
ABB RCNA-01 ControlNet Adapter Module RCNA01 New
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ASEA Brown Boveri, ABB DSPC 153 A
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ABB BAUMER 5692435-L FEEDBACK UNIT 5692435L PLSR 2XM0
ABB POWER SUPPLY CIRCUIT BOARD YTEA-250-15
NEW ABB 164S227 MOD 300 RETROFIT KIT
ABB DSQC 202 Computer board YB 560 103-AC
ABB ACS600 INVERTER EL55P2 50A CURRENT TRANSCEIVER
NEW ABB 6008BZ10000C VIDEO MODULE PCB
NEW ABB 6024BP10300C-1865 VIDEO MODULE PCB
ABB DSQC303 3HAA3573-ADA ROBOT 3HAA3573ADA DSQC 303
ABB ACS 500 AC DRIVE 7.5 HP 11 AMP ASC501-005-4-00P2
YASKAWA SGMG-09A2ABB AC SERVO MOTOR
ABB YTE102C YT213001-AC/4 ROBOT SERVO AMP YT213001AC4
ABB Taylor Automation Module PN 6203BZ10000A
ABB TAYLOR MOD 300 HIGH SPEED COUNTER I/O MODULE
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ABB Analog Input IMFEC11 *NEW IN BOX #11150
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Taylor ABB 6204BP10821B-K MOD 300 I/O Module
ABB ACS600 Inverter NINT-46C Driver Board 57619783E 1/4
ABB CA7D-NC30 AUXILLARY CONTACTOR
NEW ABB BC25-40-22 CONTACTOR BC254022
ABB TAYLOR 6241BP10822A-F ELECTRONIC LINK MODULE
ABB 600 AMP BREAKER UXAB 710530 R 999
ABB KENT TAYLOR 1725FZ14000A I/O CHASIS RACK NEW
ABB ACS141-2K1-1-U ACS141 230V 1.5HP @ 5.9A
