当SVC_REQ接收能流，它请求CPU执行由FNC操作数确定的特别服务.SVC_REQ的参数设置在参数块中，它们以PRM操作数确定的基准地址为起始值，必需的16位基准地址数目取决于被请求的特别PLC服务类型.参数块用于储存功能块的输入和输出量。SVC_ REQ传递能流，除非指定了错误的功能块数,错误的参数或超出范围基准地址。不同的特殊SVC_REQ功能有另外的引起失败的原因
PHD Pneumatic Parallel Gripper 19070-2-0041 #21823
Omron Remote Master I/O Module C500-RM201 #8190
Baldor Industrial Motor L3353, HP 1/6, RPM 1725, #21905
NIB Datalogic PC Bus Barcode Decoder Board #20949
Sensormatic 0301-1510-01 Circuit Board #20925
Tesch Emergency Stop Relay F121 #16239
EGD PC Board PA88c #6925
EGD PC Board PA88a, #6933
LOT of 2, Festo Circuit Board K-350740 #12522
Hitachi Programmable Controller PHJ-DR #13956
Thomas Betts Connector 32511, Box of 2, #10300
US Drives PC Board 3000-4075-1 #6881
Abicor Binzel Mig Welding Gun 785H-45MX #30264
NIB SCI Circuit Board 080-2370-6 Rev E / H #24324
Abicor Binzel Mig Welding Gun R5A-C-35MX #30263
NIB SCI Circuit Board 080-2370 Rev G E / H #25182
Allen Bradley 709AOD Starter Series K, Size 0 #8522
MOS Integrated Circuit Board 923.055, 923055 #8767
MOS Integrated Circuit Board 923.057, 923057 #8765
MOS Integrated Circuit Board 923.053, 923053 #8763
MOS Integrated Circuit Board 923.052, 923052 #8762
MOS Integrated Circuit Board 923.051, 923051 #8757
TJS Oxygen / Mixed Bed Cartridge Z50221 #28751
Engel Slot Rack EC88, #27131
