ABB PFSA140 3BSE006503R1 卷筒供应单元 必须采取电气隔离与抗干扰措施

PFSA140 3BSE006503R1    卷筒供应单元

开关星输入是PLC与现场的以开关量为输出形式的检测元件(如操作控制按钮、行程开关、接近开关、压力继电器等)的连接通道，它把反映生产过程的有关信号转换成CPU单元所能接收的数字信号。为了防止各种干扰和高电压窜入PLC内部而影响PLC工作的可靠性，必须采取电气隔离与抗干扰措施。在工业现场，出于各种原因的考虑，可能采用直流供电，也可能采用交流供电，PLC要提供相应的直流输入、交流输入接口。

Switch star input is the connection channel between PLC and on-site detection components (such as operation control buttons, travel switches, proximity switches, pressure relays, etc.) in the form of switch output. It converts relevant signals reflecting the production process into digital signals that can be received by the CPU unit. In order to prevent various interferences and high voltages from entering the PLC and affecting its reliability, electrical isolation and anti-interference measures must be taken. In industrial sites, for various reasons, DC power supply or AC power supply may be used. PLC should provide corresponding DC input and AC input interfaces.