HIMA   H4135A 992413560 安全继电器 安全回路是联锁控制的回路

H4135A 992413560   安全继电器

安全回路是联锁控制的回路，用于保护负载或控制对象并防止操作错误或控制故障。在直接控制负载的同时，安全保护回路向PLC输入信号,以防便PLC保护处理。安全电路一般考虑以下几个方面。H4135A-99-2413560 HIMA安全继电器
(1)短路保护应安装在PLC外部输出电路熔断器中，短路保护。好在每个负载的电路中放置-个保险丝。
(2)联锁和联锁措施PLC的外部布线除保证程序中电路的联锁关系外，还应采取硬件互锁措施，以确保系统的安全可靠运行。
(3)断压保护和紧急关机措施PLC外部负载供电线路应有断压保护措施，当暂时停电再恢复供电时,不要按下PLC外部负载不能自行启的“启动”按钮。这种接线方式的另-个功能是，当特殊情况下需要紧急停机时，可以通过按下"紧急停止”按钮切断负载电源，并将“紧急停止”信号输入PLC。
(4)限位保护在某些情况下,如电梯等级超限可能产生危险，设置限位保护，当限位保护动作时直接切断负载电源，同时信号输入PLC。


A safety circuit is an interlocking control circuit used to protect loads or control objects and prevent operational errors or control failures. While directly controlling the load, the safety protection circuit inputs signals to the PLC to prevent PLC protection processing from being compromised. Safety circuits generally consider the following aspects. H4135A-99-2413560 HIMA Safety Relay
(1) Short circuit protection should be installed in the external output circuit fuse of the PLC for short circuit protection. It is best to place a fuse in the circuit of each load.
(2) Interlocking and interlocking measures: In addition to ensuring the interlocking relationship of the circuits in the program, the external wiring of the PLC should also adopt hardware interlocking measures to ensure the safe and reliable operation of the system.
(3) Voltage interruption protection and emergency shutdown measures: The external load power supply line of the PLC should have voltage interruption protection measures. When the power supply is restored after a temporary power outage, do not press the "start" button that cannot be automatically started by the external load of the PLC. Another function of this wiring method is that when emergency shutdown is required in special circumstances, the load power can be cut off by pressing the "Emergency Stop" button and the "Emergency Stop" signal can be input to the PLC.
(4) Limit protection may cause danger in certain situations, such as elevator level exceeding the limit, so limit protection is set. When the limit protection acts, the load power is directly cut off, and the signal is input into the PLC.