1769-L35E AB

6SN1123-1AB00-0BA2
1756-L84E
1756-L85E
3500/50-041-01-01
8270-1061
VE4005S2B1
VE4001S2T284
Spotron-SP-231N
LS2D4L
6FC5357-0BB25-0AA0

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描述

PLC和编程器公用一个CPU,编程器在编程模式时,CPU只为编程器提供服务,不对现场设备进行控制。完成编程后,编程器切换到运行模式,CPU对现场设备进行控制,不能进行编程。离线编程方式可降低系统成本,但使用和调试不方便。在线编程方式:CPU和编程器有各自的CPU,主机CPU负责现场控制,并在一个扫描周期内与编程器进行数据交换,编程器把在线编制的程序或数据发送到主机,下一扫描周期,主机就根据新收到的程序运行。这种方式成本较高,但系统调试和操作方便,在大中型PLC中常采用。

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