DS200TCCAG2A

　保证PLC控制系统能够长期安全、可靠、稳定运行，是设计控制系统的重要原则。这就要求设计者在系统设计、元器件选择、软件编程上要***考虑，以确保控制系统安全可靠。例如：应该保证PLC程序不仅在正常条件下运行，而且在非正常情况下（如突然掉电再上电、按钮按错等），也能正常工作。

 

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