1）对于继电器这类电感性负载，必须安装火花抑制器。

    2）对于容性负载，应在信号输出负载线路中串联限流电阻。电阻阻值应确保负载承受的瞬时电流和电压被限制在额定值内。

    3）在用晶体管输出直接驱动指示灯时，冲击电流可能损坏晶体管。为此应设置保护电阻以防晶体管被击穿。

4）当被驱动负载是电磁开关、电磁离合器、电磁阀线圈等交流负载，或虽是直流负载，但工作电压或工作电流超过输出信号的工作范围时，应先用输出信号驱动小型中间继电器（一般工作电压＋24V），然后用它们的触点接通强电线路的功率继电器或直接去激励这些负载（见图1）。当然，如果所用PLC装置本身具有交流输入、输出信号接口，或有用于直流大负载驱动的专用接口时，输出信号就不必经中间继电器过渡，即可以直接驱动负载器件。

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