PLC是整个系统的神经中枢，所有控制，保护，工作状态指示都通过PLC内部的虚拟继电器通过软连线配合外部给定开关量和信号来完成。控制电压在电压以下，可以提高工作的性，远离高压室进行操作，可以避免工作人员的误操作，一站式控制，可以提高工作效率，减少工作人员的劳动强度。用两条现场总线就可以实现整个系统的信号传输，通过PLC的工作状态和报警指示，便于工作和维修人员的故障排除。另外，与继电器相比，PLC的免维护性高，工作寿命长。
【瑞士ABB.. 机器人 DSQC系列,ABB Advant OCS,ABB Procontic PLC CPU】
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