数字信号输入设备端口220VAC误接防护

Interface Protection from 220VAC Misconnection of Digital Input Device

对数字信号输入设备端口误接220VAC电压问题提出解决方案。对于误接220VAC电压情况,通过端口电压钳位和自恢复限流措施限制DI设备端口电压,防止DI端口电路损坏。切实解决工业现场220V误接问题,大大扩大数字量信号输入设备应用场合。

Solution of interface protection from 220 VAC misconnection of Digital Input device was presented.In order to protect DI port circuit from damage,port voltage clamping and self recovered limiting measures can be used under 220VAC voltage misconnection conditions.With the solution mentioned above,the 220 VAC misconnection problem can be solved properly,in the meantime,the applications of the digital input device can be widely expanded.