Honeywell 7800 Series Installation Instructions Manual page 25

Diagnostic Information Index
The relay module with the optional KDM can monitor input/
output terminals and can display the status of the terminal on
the KDM display (for example, Pilot Valve T8 1<); see S7800
Keyboard Display Module specification, form 65-0090. A
complete terminal description and terminal number are pro-
vided. The display shows the actual status of the terminal. If
voltage is detected at the terminal, 1 is displayed; but if volt-
age is not present at the terminal, 0 is displayed.
Historical Information Index
The relay module has nonvolatile memory that allows it to
retain historical information for the six most recent lockouts.
Each of the six lockout files retains the cycle when the fault
occurred, the hour of operation when the fault occurred, and
the fault message and burner status when the fault occurred.
The historical information can be viewed by the optional
S7800 KDM.
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RM7890, RM7895 100 Vac
32-00216-01