n order to further improve the reliability of the PLC, for large-scale PLC also uses dual-cpu module constitute a redundant system, or the use of three CPU of voting systems. Thus, even if a cpu modules plc fails, the whole system is still running.
CPU speed and memory capacity are important parameters for PLC, which determines the operating speed of the PLC, I / O number and software capacity, etc., thereby limiting the size of the control.
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