BENTLY NEVADA 125800-01
外部安全电路系统是为了确保整个系统能在安全状态下牢靠工作，避免由于外部电源发作问题、PLC呈现异常、误操作以及误输出形成的严重经济损失和人身伤亡事故，而装置的必要维护电路。
①电源过负荷的防护。假如PLC电源发作问题，中缀时间少于10秒，PLC工作不受影响，若电源中缀超越10秒或电源降落超越允许值，则PLC中止工作，一切的输出点均同时断开;当电源恢复时，若RUN输入接通，则操作自动停止。因而，对一些易过负载的输入设备应设置必要的限流维护电路。
②严重问题的报警及防护。关于易发作严重事故的场所，为了确保控制系统在严重事故发作时仍牢靠的报警及防护，应将与严重问题有联络的信号经过外电路输出，以使控制系统在安全情况下运转。
③急停电路。关于能运用户形成伤害的风险负载，除了控制次第中加以思索之外，还应设计外部紧急停车电路，使得PLC发作问题时，能将惹起伤害的负载电源牢靠切断。
④维护电路。正反向运转等可逆操作的控制系统，要设置外部电器互锁维护;往复运转及升降挪动的控制系统，要设置外部限位维护电路。
⑤可编程控制器有监视定时器等自检功用，检查出异常时，输出全部关闭。但当可编程控制器CPU问题时就不能控制输出，因而，关于能运用户形成伤害的风险负载，为确保设备在安全状态下运转，需设计外电路加以防护。
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