描述
整体式PLC一般配备有许多专用的特殊功能单元，如模拟量I／O单元、位置控制单元和通信单元等，使PLC的功能得到扩展。
FX系列的基本单元、扩展单元和扩展模块的高度和深度相同，但是宽度不同。它们不用基板，各模块可用底部自带的卡子卡在DIN导轨上，两个相邻的单元或模块之间用扁平电缆连接，安装好后组成一个整齐的长方体。
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