Honeywell HC900 - Table 24 - Controller Behavior in Mode Transition

162 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Failover
(RSM only)
N/A
Transfers all primary tasks to the Reserve Controller,
establishing this controller as the new Lead. Does not
affect controller mode. Turn key to Failover and hold it
there until both Reserve lights are on, then release key.
Table 24 – Controller Behavior in Mode Transition
Initial Mode
New Mode
Controller Behavior
PROGRAM
RUN
Validate configuration database.
Reset all I/O scanners.
Upon startup, initiate Cold Start sequence.
Diagnostic: Identify and configure all I/O racks and modules. (All
output modules are configured with Failsafe values. Any modules
not included in the configuration are configured with default values,
which cause outputs to be Off.)
While in transition, all output modules are Off; when transition
procedures are completed, Function Block processing begins, and
output values are set to Function Block output values.
Any calibration process that was in progress is immediately aborted,
and the results are discarded.
PROGRAM
OFFLINE
Same as PROGRAM to RUN transition, except that Function Blocks
are not processed, and outputs remain Off.
Any calibration process that was in progress is immediately aborted,
and the results are discarded.
RUN
PROGRAM
Set all channels of all output modules to Off.
Set all output module Failsafe values to the Off state.
Turn off the LED indications on all output modules.
OFFLINE
PROGRAM
Same as RUN to PROGRAM transition.
Any calibration process that was in progress is immediately aborted,
and the results are discarded.
RUN
OFFLINE
Freeze output module channels.
Freeze Force LED indications on all output modules.
OFFLINE
RUN
Function Block execution starts immediately.
Any calibration process that was in progress is immediately aborted,
and the results are discarded.