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易卖工控网(www.ymgk.com)提供”DSAO120A 3BSE018293R1”,产品详情:品牌/厂家:ABB、型号:DSAO120A 3BSE018293R1、成色:全新、货期:现货 1天内发货、保修:180天,更多产品详情就上易卖工控网。
PLC的输出电路形式一般分为:继电器输出,晶体管输出和晶闸管输出三种。弄清这三种输出形式的区别,对于PLC的硬件设计工作非常有必要。下面以三菱PLC为例,简要介绍一下这三种输出电路形式的区别和注意事项,其它公司的PLC输出电路形式也大同小异。
1、继电器输出电路
该种输出电路形式外接电源既可以是直流,也可以是交流。PLC继电器输出电路形式允许负载一般是AC250V/50V以下,负载电流可达2A,容量可达80~100VA(电压×电流),因此,PLC的输出一般不宜直接驱动大电流负载(一般通过一个小负载来驱动大负载,如PLC的输出可以接一个电流比较小的中间继电器,再由中间继电器触点驱动大负载,如接触器线圈等)。
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