输入输出设备：它用以接收信号或输出信号，便于与PLC进行人机对话。输入的有条码读入器，输入模拟量等。输出的有打印机、编程器、监控器虽也可对PLC输入信息，从PLC输出信息，但输入输出设备实现人机对话更方便，可在现场条件下实现，并便于使用。随着技术进步，这种设备将更加丰富。
FERRAZ SHAWMUT AMP-TRAP A30QS600-4 SEMICONDUCTOR FUSE NEW
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Siemens Simovert Masterdrives 6SE7021-0TA84-1HF2
LFE 0303XU TEMP CONTROLLER
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CONTROLWEIGH ST6 SUMMING CARD NEW
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ALLEN BRADLEY 1336S-BRF20-AE-EN4 DRIVE 1336SBRF20AEEN4
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