57C409

描述

57C409

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*也是影响控制系统可*性的重要因素。以开关量输入为 例，按钮、行程开关的触点接触要保持在良好状态，接线要牢固可*。机械限位开关是容易产生故障的元件，设计时，应尽量选用可*性高的接近开关代替机械限位 开关。此外，按钮触点的选择也影响到系统的可*性。在设计电路时，应尽量选用可*性高的元器件，对于模拟量输入信号来说，常用的有4～20mA、 0～20mA直流电流信号;0～5V、0～10V直流电压信号，电源为直流24V。

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*性降低，严重时导致系统不能正常工作。如晶闸管输出只能用于交流负载，晶体管输出只能用于直流负载。此外，PLC的输出端子带负载能力是有限的，如果 超过了规定的最大限值，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*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。这一方面可以通过选用高质量的元器件来提高可*性，另一方面，在对系统可*性及智能化要求较高的场合，可以根 据电路中电流异常的情况对输出单元的一些重点部位进行诊断，当检测到异常信号时，系统按程序自动转入故障处理，从而提高系统工作的可*性。若PLC输出端 子接有感性元件，则应采取相应的保护措施，以保护PLC的输出触点。

为了防止或减少外部配线的干扰，交流输入、输出信号与直流输入、输出应分别使用各自的电缆;对于集成电路或晶体管设备的输入、输出信号线、必须使用屏 蔽电缆，屏蔽电缆在输入、输出侧悬空，而在控制侧接地。

软件抗干扰措施硬件抗干扰措施的目的是尽可能地切断干扰进入控制系统，但由于干扰存在的随机性，尤其是在工业生产环境下，硬件抗干扰措施并不能将各种干扰完全拒之门 外，这时，可以发挥软件的灵活性与硬件措施相结合来提高系统的抗干扰能力。

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