当用PLC进行网络设计时,其难度比PLC单机控制大得多
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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Festo 18980 Pneumatic 24 VDC Intell. Valve Manifold VIFB-03-B VIGI-03-4.0
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Mitsubishi Servo Drive Unit, MR-SE01, , 90 Day
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Numatics B Solenoid
Allen Bradley Data Highway II Computer Interface, 1779-KFMR,
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Used MDC Angle Valve
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Veriflo 944SSFS8MF Valve
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IBM 87X4701 Detect Head Interface Board
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