R911296131 REXROTH

IS200STURH2A GE PLC
1C31234G01 GE CPU
IC694ALG223-DB GE CPU
IC697CPU781-JD GE PLC
IC693APU301 GE
IS230TRLYH1B GE
IS230TSVCH1A GE PLC
IS230TTURH1C GE

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描述

PLC运行正常时,扫描周期的长短与用户应用程序的长短、CPU的运算速度、I/O点的情况等有关。通常用PLC执行1KB指令所需时间来说明其扫描速度(一般1-10ms/KB)。值得注意的是,不同指令执行时间是不同的,故选用不同指令所用的扫描时间将会不同。若用于高速系统要缩短扫描周期时,可从软硬件上同时考虑。PLC周期性循环扫描工作方式的显著特点是:可靠性高、抗干扰能力强,但响应滞后、速度慢。

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