1788-EN2DN

标题：供应1788-EN2DN

们选择用什么样的方式活下去，这个永远比你想的要更精彩，不要败给生活。

plc程序设计与否的几个评价重点指标

（1）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。

（2）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。

（3）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。

（4）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。

（5）plc程序的可读性好。

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