052852
输出模块的功率放大元件有驱动直流负载的大功率晶体管和场效应管、驱动交流负载的双向晶闸管，以及既可以驱动交流负载又可以驱动直流负载的小型继电器。输出电流的典型值为0.3～2A，负载电源由外部现场提供。
图2-5是继电器输出电路。内部电路使继电器的线圈通电，它的常开触点闭合，使外部负载得电工作。继电器同时起隔离和功率放大作用，每一路只给用户提供一对常开触点。与触点并联的RC电路和压敏电阻用来xc触点断开时产生的屯弧，以减轻它对CPU的干扰。
图2.6是晶体管集电极输出电路。。输出信号送给内部电路中的输出锁存器，再经光耦合器送给输出晶体管，后者的饱和导通状态和截止状态相当于触点的接通和断开。图中的稳压管用来抑制关断过电压和外部的浪涌电压，以保护晶体管，晶体管输出电路的延迟时间<1ms。场效应管输出电路的结构与晶体管输出电路基本上相同。
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