3HAC14459-1 ABB

ABB 3HAC15571-1
ABB 3HAA1001-266
ABB 3HAC15534-1
ABB 3HAC14631-1
ABB 3HAC15521-2
ABB 3HAC1515882-1

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Description

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,必须精通PLC的基本原理。

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