46-47
Description Output [ ] total current feedback unhealthy
Possible Cause
•
Commanded output is beyond the range of the output.
•
Field wiring problem
•
Field device problem
•
Open loop or too much resistance in the loop.
Solution
•
Verify that the commanded output is within the range of the output.
•
Confirm the correct I/O pack 28 V input power.
•
Check the field wiring and the component.
•
Replace the I/O pack.
48-49
Description Output [ ] Internal reference current unhealthy
Possible Cause I/O pack failure
Solution
•
Confirm the correct I/O pack 28 V input power.
•
Replace the I/O pack.
66-67
Description Output [ ] Individual current too high relative to total current
Possible Cause In a TMR setup, the individual current feedback is greater than ½ the total current feedback + TMR_
SuicLimit.
•
The TMR_SuicLimit is set too low.
•
Hardware failure causing one I/O pack to drive too much output current
Solution
•
Verify that the value of TMR_SuicLimit is set correctly.
•
Replace the I/O pack.
102
GEH-6855_Vol_II
GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
Public Information