控制器的一个重要功能是提供报警继电器触点。
An essential function of the controller is to provide alarm relay contacts.
检查电器控制线路并清洁其接触点，查看各气压，气阀；气动控制器是否正常。
Check the equipment controlling circuit and clean the contacting places. Check the pressure and valve, and if the pneumatic controller is working normally.
结合一个液压试验台的设计实例，介绍了PLC控制器的触点的合理配置问题。
Rational contact configuration of PLC in hydraulic test platform design is introduced in this paper with an example.
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