描述
整体式PLC的每一个I／O点的平均价格比模块式的便宜，且体积相对较小，所以一般用于系统工艺过程较为固定的小型控制系统中；而模块式PLC的功能扩展灵活方便，I／O点数量、输入点数与输出点数的比例、I／O模块的种类等方面，选择余地较大。维修时只要更换模块，判断故障的范围也很方便。因此，模块式PLC一般适用于较复杂系统和环境差（维修量大）的场合。
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