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How to solve iFix does not get PLC value correctly problem?

Problem

An iFix application displays Allen-Bradley PLC values through Industrial Gateway Server (IGS). It works well when PLC’s sixteen bit integers are positive. However, when sixteen bit integers go into negative, iFix displayed some strange value. A check into iFix database manager confirmed that IGS read wrong values. In the picture below, PLC value INT[7] […]