Description
PLC的组成从构造上分，PLC包含固定式和组合式（模块式）二种。固定式PLC涉及CPU板、I/O板、显示面板、运存块、电源等，这些元素组成1个不可拆卸的整体。模块式PLC包括CPU模块、I/O模块、运存、电源模块、底板或机架，这些模块可以按照一定规则组合配置。
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