6DP1210-8BC控制模块

详情描述：

模拟量，如电流、电压、温度、压力等等，它的大小是连续变化的。工业生产，特别是连续型生产过程，常要对这些物理量进行控制。
作为一种工业控制电子装置，PLC若不能对这些量进行控制，那是一大不足。为此，各PLC厂家都在这方面进行大量的开发。目前，不仅大型、中型机可以进行模拟量控制，就是小型机，也能进行这样的控制。
PLC进行模拟量控制，要配置有模拟量与数字量相互转换的A／D、D／A单元。它也是I/O单元，不过是特殊的I/O单元。
A/D单元是把外电路的模拟量，转换成数字量，然后送入PLC。D/A单元，是把PLC的数字量转换成模拟量，再送给外电路。
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。
这样，用PLC实现模拟量控制是完全可能的。控制的单位值可小到212分之一的测量程值，多数也是足够的。
PLC进行模拟量控制，还有A/D、D/A组合在一起的单元，并可用PID或模糊控制算法实现控制，可得到很高的控制质量。
用PLC进行模拟量控制的好处是，在进行模拟量控制的同时，开关量也可控制。这个优点是别的控制器所不具备的，或控制的实现不如PLC方便。
当然，若纯为模拟量的系统，用PLC可能在性能价格比上不如用调节器。这也是应当看到的。

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