Stray signals at Analog Inputs

-2V? The analog inputs on the plc are 0-10V only. No negative values allowed or it goes into overflow.

If you want +/-10V range, you can use an add-on signal module for AI or AI/AQ.

If possible, can you compare the wiring to the reference wiring for your device? It may be a simple common or bonding problem, or something else entirely.

The input is a 16-bit value, and UINT or INT. For values > 27648, some sort of error on that channel exists.

If you are looking ata word, you are picking up both analog inputs intoa single tag.

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