3BSE030220R1 CI854AK01 ABB

3HAC021136-001 ABB
3HAC021224-001 ABB
3HAC021272-003 ABB
3HAC021286-001 ABB
3HAC021313-005 ABB
3HAC021333-007 ABB HART
3HAC021353-001 ABB
3HAC021448-001 ABB
3HAC021475-001 ABB PLC

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描述

输入设备多功能化在传统的继电控制系统中,一个主令(按钮、开关等)只产生一种功能的信号。在PLC控制系统中,一个输入设备在不同的条件下可产生不同的信号,如一个按钮既可用来产生启动信号,又可用来产生停止信号。如图4所示,只用一个按钮通过X000去控制Y000的“通”与“断”。即第一次接通X000时Y000“通”再次接通X000时Y000“断”。

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