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Siemens S7-400 PLC因其强大的功能持久的稳定性在控制系统中应用越来越广,但是由于回路串电及供电负载变化导致卡件烧毁的情况也时有发生,故设计卡件的保护电路显得尤为必要。某能源化工公司空分装置机组控制系统采用了Siemens S7-400 PLC,重要工艺参数配置了冗余故障安全模块进行组态,其硬件电路里采用了二极管稳压二极管等来实现保护。
Siemens S7-400 PLC because of its powerful function of lasting stability in the control system is more and more widely used, but due to loop power supply and load changes caused by the card pieces burned from time to time, so the design card protection Circuit is particularly necessary. An energy chemical company air separation plant unit control system uses a Siemens S7-400 PLC, the configuration of the important parameters of the redundant fail-safe module configuration, the hardware circuit using a diode Zener diode to achieve protection.