Honeywell HC900 - Diagnostics and Troubleshooting; Controller CPU indicators

Revision 6 HC900 Process & Safety Controller User and Installation Manual 159
21 April 2017
OFFLINE Mode
The OFFLINE Mode can be entered only from the RUN Mode, and is intended primarily for performing AI
calibration.
CAUTION
Because Function Blocks are not processed and outputs are Frozen in this mode,
inputs (that is, process values) can vary from the values that existed when the
OFFLINE Mode was entered.
In Controllers with firmware earlier than V 6.0, the controller will resume program
execution with current available data when controller returns to RUN mode.
In Controllers with firmware version 6.0 or greater, the controller’s memory will get re-
initialized, outputs will be de-energized and the controller will restart when changing
from Offline to Run mode.
Before entering the OFFLINE Mode:
 KNOW all potential consequences of suspending control action..
 PLAN for all operator actions required to preclude adverse consequences while
processing is suspended, and when resuming control processing.
 EXECUTE prudent control actions (such as placing all control loop in the Manual
Mode).
Failure to comply with these instructions may result in product damage.