1756-L55/A
1756-L55/A
1756-L55/A
模块式的PLC是按功能分成若干模块，如CPU模块、输入模块、输出模块、电源模块等等。大型机的模块功能更单一一些，因而模块的种类也相对多些。这也可说是趋势。目前一些中型机，其模块的功能也趋于单一，种类也在增乡。如同样OMRON公司C20系列PLC，H机的CPU单元就含有电源，而Ha机则把电源分出，有单独的电源模块。
模块功能更单一、品种更多，可便于系统配置，使PLC更能物尽其用，达到更高的使用效益。
由模块联结成系统有三种方法：
①无底板，靠模块间接口直接相联，然后再固定到相应导轨上。德维森公司的V80系列PLC就是这种结构，比较紧凑。
②有底板，所有模块都固定在底板上。如德维森公司的PPC11、PPC22和PPC31系列PLC，OMRON公司的C200Ha机，CV2000等中、大型机就是这种结构。它比较牢固，但底板的槽数是固定的，如3、5、8、10槽等等。槽数与实际的模块数不一定相等，配置时难免有空槽。这既浪费，又多占空间，还得占空单元把多余的槽作填补。
③用机架代替底板，所有模块都固定在机架上。这种结构比底板式的复杂，但更牢靠。一些特大型的PLC用的多为这种结构。
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