Operating Characteristics - Controller Modes
152 HC900 Process Controller Installation and User Guide Revision 19
06/14
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.
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