F8650X HIMA

MDSKSRS036-23
6SE7038-6GL84-1JA1
HIEE300661R0001
6SE7024-1EP85-0AA0
1398-PDM-020
140CPU21304
2MLI-CPUU

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描述

PLC采用扫描方式工作。从实时性要求来看,处理速度应越快越好,如果信号持续时间小于扫描时间,则PLC将扫描不到该信号,造成信号数据的丢失。

处理速度与用户程序的长度、CPU处理速度、软件质量等有关。目前,PLC接点的响应快、速度高,每条二进制指令执行时间约0.2~0.4Ls,因此能适应控制要求高、相应要求快的应用需要。扫描周期(处理器扫描周期)应满足:小型PLC的扫描时间不大于0.5ms/K;大中型PLC的扫描时间不大于0.2ms/K。

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