生产机械电气控制系统的设计
PLC程序的正确性。
正确的程序必须能经得起系统运行实践的考验。
PLC程序的可靠性。
能保证系统在正常和非正常（短时掉电、某些被控量超标、某个环节有故障等）情况下都能安全可靠地运行。
能保证在出现非法操作（如按动或误触动了不该动作的按钮等）情况下不至于出现系统失控。
PLC参数的易调整性好。
经常修改的参数，在程序设计时必须考虑怎样编写才能易于修改。
PLC程序结构简练。
简练的程序，可以减少程序扫描时间、提高PLC对输入信号的响应速度。
PLC程序的可读性好。
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