1）每一逻辑行总是起于左母线，然后是触点的连接，后终止于线圈或右母线（右母线可以不画出）。注意：左母线与线圈之间一定要有触点，而线圈与右母线之间则不能有任何触点。
PLC要求环境温度在0~55℃，安装时不能放在发热量大的元件下面，四周通风散热的空间应足够大，基本单元和扩展单元之间要有30mm以上间隔；开关柜上、下部应有通风的百叶窗，防止太阳光直接照射；如果周围环境超过55℃，要安装电风扇强迫通风。
JANCD-FC191-2
531 3312A
如果系统较大，远程单元、本地机架数量、每个机架的模块数量的限制，并非出于系统功能和技术上的限制，而是由于使用规范性的限制。在系统硬件组态时，要考虑这些模块的搭配作用。
输入接线还应特别注意：
FX系列PLC有直流24V输出接线端，该接线端可为输入传感器（如光电开关或接近开关）提供直流24V电源。当输入端使用外接直流电源时，应选用直流稳压电源。因为普通的整流滤波电源，由于纹波的影响，容易使PLC接收到错误信息。
5.输出指示
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