3HAC15990-1 ABB

ABB 3HAC15879-1
ABB 21522012-430
ABB 3HAC14459-1
ABB 3HAC15571-1
ABB 3HAA1001-266
ABB 3HAC15534-1

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Description

根据I/O映象区内对应的状态和数据刷新所有的输出锁存电路,再经输出电路驱动相应的外设,这时,才是PLC的真正输出。可见,采用PLC程序控制的过程和结果与继电器逻辑回路是有区别的,特别是涉及到梯级的次序、脉冲信号的捕捉等,与PLC的扫描原理是密切相关的。实践中,大量的程序问题均源于此,常常会出现不可思议的结果。因此,设计PLC程序

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