PLC system analog volatile and unstable when the cause of the problem

PLC controller system changes in the analog is a very unstable values, may be the following reasons: you may use a power supply or isolation sensor power supply, two power not connected to each other, namely the power of the analog input module and sensor signal ground is not connected. This will generate a high common-mode voltage fluctuation of vibration, analog input values. Another reason may be analog input module wiring is too long or insulation. Can use the following methods to solve: 1) Connect the negative terminals of the sensor input and module of public M side to compensate for such fluctuations. ( But attention should be paid to ensure that this is the only link between the two power supply systems. ) Background: internal analog input module is not isolated; Common mode voltage should be not more than 12 v. For common mode rejection ratio of 60 hz jamming signal is 40 db. 2) Use the analog input filter.
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