1794-IM16
1794-IM16
1794-IM16
汇点式的开关量输入模块所有输入点共用一个公共端（COM）；而分组式的开关量输入模块是将输入点分成若干组，每一组（几个输入点）有一个公共端，各组之间是分隔的。分组式的开关量输入模块价格较汇点式的高，如果输入信号之间不需要分隔，一般选用汇点式的。
3）注意同时接通的输入点数量
对于选用高密度的输入模块(如32点、48点等)，应考虑该模块同时接通的点数一般不要超过输入点数的60％。
4）输入门槛电平
为了提高系统的可靠性，必须考虑输入门槛电平的大小。门槛电平越高，抗干扰能力越强，传输距离也越远，具体可参阅PLC说明书。
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