Bently Nevada 3500/25

• 型号：3500/25


• 数量：3


• 制造商：　厦门兴锐达自动化设备有限公司


• 有效期：2019/11/28 0:00:00

Bently Nevada 3500/25

Bently Nevada 3500/25

Bently Nevada 3500/25

随着PLC技术的不断发展，PLC的应用范围日益广泛，使得当今的电气工程技术人员在设计电气控制系统时，会有更多的机会考虑选用PLC控制。在传统的继电器-接触器控制系统和PLC控制系统、微机控制系统这三种控制方式中，究竟选取哪一种更合适，这需要从技术上的适用性、经济上的合理性进行各方面的比较论证。这里提供以下几点依据，以供在考虑是否选用PLC控制时参考：

（1）输入、输出量以开关量为主，也可有少量模拟量。

（2）I/O点数较多。这是一个相对的概念。在70年代，人们普遍认为I/O点数应在70点以上选用PLC才合算；到了80年代，降为40点左右；现在，随着PLC性能价格比的不断提高，当总点数达10点以上就可以考虑选用PLC了。

（3）控制对象工艺流程比较复杂，逻辑设计部分用继电器控制难度较大。

（4）有较大的工艺变化或控制系统扩充的可能性。

（5）现场处于工业环境，而又要求控制系统具有较高的工作可靠性。

（6）系统的调试比较方便，能在现场进行。

（7）现场人员有条件掌握PLC技术。

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BENTLY NEVADA3300/25-01-03-03-00-00-01-00

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