Honeywell HC900 Reference Manual page 97

Output
ALMUNACK Alarm unacknowledge is ON if any operator panel's alarm is unacknowledged.
HWOK Hardware OK is ON if there are no faults.
LOWBTRY Low Battery is ON if the battery is low, Off when battery is good.
HI TEMP High CJ Temperature is ON if the CJ temperature is high.
MSTR FAIL Communications Failure is ON when Modbus master diagnostic is not good
BAD BLOCK Bad Block is ON when one or more blocks are not operating properly.
LOCKED On when Controller Mode switch is locked in the current mode by switch position.
TIME OFF Number of seconds power was turned off. Valid for one cycle of control blocks execution following
power up. Then it is cleared to zero.
DS LIMIT ON when the configuration storage warning limit is exceeded. OFF when the storage capacity falls
below the warning limit.
RSV AVAIL
C70R controllers only. ON when the Reserve CPU is available for failover. OFF when the Reserve
CPU is unavailable for failover.
On other controllers this pin is called "N/A" and serves no purpose other than a placeholder for
RSV AVAIL.
Possible reasons:
No Reserve CPU installed.
Hardware failure is preventing database synchronization between the CPUs.
Firmware mismatch between the CPUs.
Revision 11
2/07
HC900 Hybrid Control Designer Function Block Reference Guide
Description
Function Blocks
83