Signal Noise in Allen Bradley 1771-IFE Analog Input Module


Thread Starter

Roger L. Pugoy

We are using Allen Bradley in our three 16MW Gas Turbines. We experienced a trip on one of the turbine when maintenance crew were working inside the control cabinet (where the PLC is) of the other non-running unit. We found out that the trip occurred when the technician touched one of the terminals connected to the 1771-IFE module. We were able to duplicate the incident and later remedied it by installing opto isolation to the inputs. I would like to know if other sites happen to have similar experience and what their corrective measures were.