GE Industrial Solutions Entellisys System User Manual - Manual (Page 145)

Discrete inputs/outputs 145
10
10.1.4 Troubleshooting
Discrete input status does not change despite toggling corresponding input relay
• Discrete I/O point was configured as an input but the CPUs were not restarted and new
configuration did not take effect. Restart CPUs and verify that discrete input responds to
relay toggling.
• Discrete I/Os are in test mode and the input in question has a forced state set to something
other than Disabled. Verify if the discrete I/O test mode is turned on by accessing the
Discrete Inputs/Outputs dialog box and clicking the Force Contact I/O button.
• Toggling time is too short for configured input debounce settings. Verify that debounce time
setting is shorter than the time that the input relay stays in one state.
• There is no continuity in the circuit connecting the discrete I/O board with input relays. Verify
that there is continuity.
• Discrete I/O board that the discrete I/O input is serviced by is defective. Replace the board
with a new one.
Discrete output status does not change while it is expected to do so
• Discrete I/O point was configured as an output but the CPUs were not restarted and the new
configuration did not take effect. Restart CPUs and verify that discrete output changes its
state according to the expectations.
• Make sure that the Operation parameter of the output’s configuration refers to the correct
FlexLogic operand and that the operand evaluates to the expected value.
• Discrete I/Os are in test mode and the output in question has its forced state set to
something different than Disabled. Verify if the discrete I/O test mode is turned on by
accessing the Discrete Inputs/Outputs dialog box and clicking the Force Contact I/O button.
• There is no continuity in the circuit connecting the discrete I/O board with output relays.
Verify that the continuity exists.
• Discrete I/O board that the discrete I/O output is serviced by is defective. Replace the board
with a new one.
Discrete output status does not change to de-energized or off
• FlexLogic operand configured in Operation parameter of the discrete output does not
evaluate to false. Verify that Operation parameter associated with the output refers to a
correct FlexLogic operand and the operand evaluates to false.
• FlexLogic operand configured in Seal In parameter of the discrete output does not evaluate
to false. Verify that Seal In parameter associated with the output refers to the correct
FlexLogic operand and that the operand evaluates to false.
• Discrete I/Os are in test mode and the output in question has its forced state set to
something different than Disabled. Verify if the discrete I/O test mode is turned on by
accessing the Discrete Inputs/Outputs dialog box and clicking the Force Contact I/O button.
• Discrete I/O board that the discrete I/O output is serviced by is defective. Replace the board
with a new one.
Discrete I/Os behave inconsistently after FlexLogic file was loaded
• Loading the FlexLogic files may rearrange assignments of discrete I/O point direction.
Restart CPUs for the new assignments to take effect.