5.3 YDIA Specific Alarms
The following alarms are specific to the YDIA I/O pack.
56-79
Description Contact Input [ ] not responding to self-test mode
Possible Cause The input hardware internal to the I/O pack has experienced a failure.
Solution Replace the I/O pack.
80-143
Description Logic Signal [ ] Voting Mismatch
Possible Cause
• In a TMR application, the values for the specified contact do not agree between the R, S, and T I/O packs.
• A contact input is toggling at the same rate as the configured input filter.
Solution
• Verify that R, S, and T I/O packs are equal with ToolboxST configuration.
• Check the I/O pack power and networking.
• Check the I/O pack mounting on terminal board.
• Check to see if a contact input is toggling at the same rate as the input filter. If so, resolve the cause of the toggling
contact input.
• Replace the I/O pack.
240
Description Excitation Voltage not valid, Contact Inputs not valid
Possible Cause The contact excitation voltage applied to the terminal board is not within the acceptable range for the
board.
Solution Check power distribution and wiring to ensure that the correct excitation voltage is applied to the terminal board.
120 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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