型号:DIGIFAS7116
品牌:DIGIFAS
PLC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。
The external safety circuit system of PLC is to ensure that the whole system can work reliably in a safe state,and to avoid serious economic losses and personal injuries caused by external power supply problems,PLC abnormalities,misoperation and misoutput.It is necessary to maintain the circuit of the device.
①Protection against power overload.If the PLC power supply has a problem and the infixing time is less than 10 seconds,the PLC operation will not be affected.If the power infixing exceeds 10 seconds or the power drop exceeds the allowable value,the PLC will stop working and all output points will be disconnected at the same time;When the power is restored,if the RUN input is connected,the operation will stop automatically.Therefore,necessary current limiting maintenance circuit shall be set for some input equipment that are easy to overload.
②Alarm and protection of serious problems.For places prone to serious accidents,in order to ensure the reliable alarm and protection of the control system in the event of serious accidents,the signals connected with serious problems shall be output through the external circuit to enable the control system to operate under safe conditions.
③Emergency stop circuit.As for the risk load that can transport users to cause injury,in addition to the consideration in the control sequence,the external emergency stop circuit should also be designed so that when the PLC has a problem,the power supply of the load that causes injury can be reliably cut off.
④Maintain the circuit.The control system of reversible operation such as forward and reverse operation shall be set with external electrical interlocking maintenance;External limit maintenance circuit shall be set for the control system of reciprocating operation and lifting movement.
⑤The programmable controller has self checking functions such as monitoring timer,and all outputs are turned off when abnormal conditions are detected.However,when the CPU of the programmable controller is in trouble,it cannot control the output.Therefore,in order to ensure that the equipment operates in a safe state,external circuits should be designed to protect the risk load that can cause injury to users.
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