1771-P4S
1771-P4S
1771-P4S
确定继电器电路图中的中间继电器、时间继电器等各器件与PLC中的辅助继电器和定时器的对应关系。
以上(2)和(3)两步建立了继电器电路图中所有的元器件与PLC内部编程元件的对应关系,对于移植设计法而言,这非常重要。在这过程中应该处理好以几个问题:
1)继电器电路中的执行元件应与PLC的输出继电器对应,如交直流接触器、电磁阀、电磁铁、指示灯等;
2)继电器电路中的主令电器应与PLC的输入继电器对应,如按钮、位置开关、选择开关等。热继电器的触点可作为PLC的输入,也可接在PLC外部电路中,主要是看PLC的输入点是否富裕。注意处理好PLC内、外触点的常开和常闭的关系。
3)继电器电路中的中间继电器与PLC的辅助继电器对应;
4)继电器电路中的时间继电器与PLC的定时器或计数器对应,但要注意:时间继电器有通电***型和断电***型两种,而定时器只有“通电***型”一种。
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