IC697CMM742    
IC697CMM742    
    

作为一种特殊的I/O单元，它仍具有I/O电路抗干扰、内外电路隔离，与输入输出继电器（或内部继电器，它也是PLC工作内存的一个区。可读写）交换信息等等特点。

这里的A/D中的A，多为电流，或电压，也有为温度。D/A中的A，多为电压，或电流。电压、电流变化范围多为0～5V，0～10V，4～20mA。有的还可处理正负值的。

这里的D，小型机多为8位二进制数，中、大型多为12位二进制数。

A/D、D/A有单路，也有多路。多路占的输入输出继电器多。

有了A/D、D/A单元，余下的处理都是数字量，这对有信息处理能力的PLC并不难。中、大型PLC处理能力更强，不仅可进行数字的加、减、乘、除，还可开方，插值，还可进行浮点运算。有的还有PID指令，可对偏差制量进行比例、微分、积分运算，进而产生相应的输出。计算机能算的它几乎都能算。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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