PLC外围电路元器件故障
此类故障在PLC工作一定时间后的故障中经常发生。在PLC控制回路中如果出现元器件损坏故障，PLC控制系统就会立即自动停止工作。输入电路是PLC接受开关量、模拟量等输入信号的端口，其元器件质量的优劣、接线方式及是否牢靠也是影响控制系统可靠性的重要因素。对于开关量输出来说，PLC的输出有继电器输出、晶闸管输出、晶体管输出三种形式，具体选择哪种形式的输出应根据负载要求来决定，选择不当会使系统可靠性降低 严重时导致系统不能正常工作。此外 PLC的输出端子带负载能力是有限的.如果超过了规定的**限值.必须外接继电器或接触器.才能正常工作。外接继电器、接触器、电磁阀等执行元件的质量，是影响系统可靠性的重要因素。常见的故障有线圈短路、机械故障造成触点不动或接触不良
E17063191
MKS 628
AST-3P
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