ABB 3HAC058990-004 is the NTDI01 digital input module for an ABB S800 I/O station. It receives discrete field states such as contact or switch conditions and presents those states to the controller through the station bus.
For ABB 3HAC058990-004, the useful installation record is the relationship between field terminals, common/reference wiring and the controller input tags. A correct module in the wrong channel position can still produce an incorrect process state.
During replacement of ABB 3HAC058990-004, field energy is isolated, each discrete conductor is labeled and the returned on/off state is verified against the controller tag list before the equipment is released.







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