3HAC15571-1 ABB

ABB 3HAC15534-1
ABB 3HAC14631-1
ABB 3HAC15521-2
ABB 3HAC1515882-1
ABB 3HAC17105-1
ABB 3HAC12708-1
ABB 3HAA1001-186

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Description

根据逻辑运算的结果,刷新RAM存储区或I/O映象区对应单元的状态。在输出刷新阶段,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

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