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注意事項(xiàng)
在PLC和變頻器同時(shí)使用的自控系統(tǒng)中，應(yīng)該著重注意以下事項(xiàng)：
1、PLC供電電源與動(dòng)力系統(tǒng)電源(變頻器電源)分別配置，且PLC的供電應(yīng)該選擇隔離變壓器。
2、動(dòng)力線盡量與信號線分開，信號線要做屏蔽。
3、無論是模擬信號輸入還是模擬信號輸出，模擬量通道一律使用信號隔離模塊。
4、PLC程序里做軟件濾波設(shè)計(jì)。
5、信號地與動(dòng)力地分開設(shè)計(jì)。
matters needing attention
In an automatic control system where PLC and frequency converter are used simultaneously, the following precautions should be emphasized:
1. The PLC power supply and power system power supply (frequency converter power supply) should be configured separately, and the PLC power supply should choose an isolation transformer.
2. The power line should be separated from the signal line as much as possible, and the signal line should be shielded.
3. Both analog signal input and analog signal output use signal isolation modules for analog channels.
4. Design software filtering in PLC programs.
5. Separate the design of signal ground and power ground.
