P0911PU
P0911PU
P0911PU
1. 大限度地满足被控对象的控制要求
充分发挥PLC的功能，大限度地满足被控对象的控制要求，是设计PLC控制系统的前提，这也是设计中重要的一条原则。这就要求设计人员在设计前就要深入现场进行调查研究，收集控制现场的资料，收集相关的国内、国外资料。同时要注意和现场的工程管理人员、工程技术人员、现场操作人员紧密配合，拟定控制方案，共同解决设计中的重点问题和疑难问题。
2. 保证PLC控制系统安全可靠
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、软件编程上要全面考虑，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。
备货，备货，降降降，火火火，火火火……
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