描述
继电器控制线路是由许多真正的硬件继电器组成的。而PLC是由许多“软继电器”组成的,这些“继电器”实际上是存储器中的触发器,可以置“0”或置“1”。硬继电器的触点数有限,一般只有4至8对;而“软继电器”可供编程的触点数有无限对,因为触发器状态可取用任意次。
SSE TECHNOLOGIES M9.0 POWER SUPPLY 305-040078-220
GALAXIS RIVER SCAN R2.9H/S5.7 SPACE SCANNER ACU
MECS CORPORATION ROBOT AL100
ERICSSON 2100 RU21 2130 KRC 118 16/1 CELLULAR MODULE
ERICSSON 2100 FU12 21 KRC 118 17/1 CELLULAR MODULE R2B
DATAKINETICS SPCI4/0E SS7 4 PORTS SEPTEL PCI CARD SPCI4
IN USA OZONE ANLYZER AFX IN 2000-L2-RM
GENMARK S08R.F MOD CONT-GEN 4F EA 70315294100
MOTOROLA MVME162-032 01-W3884B W/ LAN PORTS ADD ON BORD
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ATRICA AT80021 10 GIGABIT ETHERNET MODULE FOR A-8000
COMPACT PCI 100P172820 120P243641 BLADE NEW