描述
PLC还有特殊的或称智能或称功能模块。如A/D（模入）模块、D/A（模出）模块、高速计数模块、位控模块、温度模块等等。这些模块有自己的CPU，可对信号作预处理或后处理，以简化PLC的CPU对复杂的程控制量的控制。智能模块的种类、特性也大不相同，性能好的PLC，这些模块种类多，性能也好。
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