IS200BAIAH1B 控制系统

1746-IA8
AGBB-01C
1746-IA8
WV-CP474/CH
1746-IA8
1756-IB32/B
P0916DC
1746-IA16
1769-IF4
1746-OW16
QUINT-PS-1AC/24DC/5 – 2866750
IC693CHS392
1746-P2
1746-A7
1756-IB32/B

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描述

PLC中的CPU与存储器配合,完成控制功能。它与DCS系统处理温度、压力、流量等参数的系统不同,采用快速的巡回扫描周期,一般为0.1~0.2s,更快的则选用50ms或更小的扫描周期。它是一个数字采样控制系统。

为了完成控制策略,为了替代继电器,使用户等完成类似继电器线路的控制系统梯形图,而编制了一套控制算法功能块(或子程序),称为指令系统,固化在存贮器ROM中,用户在编制应用程序时可以调用。指令系统大致可以分为两类,即基本指令和扩展指令

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