Table 36 - Scanner Module Replacement - Honeywell HC900 User And Installation Manual

Replacing the Scanner Module
Removing and replacing the Scanner Module from an I/O expansion rack (C50, C70, C75 CPU controllers
only) requires that the source of AC power is removed from the rack. Removing power from the
Expansion rack has the following consequences:

All power to all I/O modules in the rack will be lost; hence all control outputs from the rack to the
process are lost.

Redundant controllers will operate with the affected I/O in failsafe state during Scanner2 module
replacement

Does not impact other I/O Racks in the same configuration
Step
1. If a process is currently in operation, then:

consequences on any running process, or

2. Using an external (user-supplied) switch, disconnect the power supply or supplies in the
expansion rack from the site AC power source.
3. Unplug the cable(s) from the scanner port(s).
4. At the top and bottom of the Scanner Module, loosen the captured screws that secure the module
in the rack, and remove the module from the rack.
5. Configure the scanner address jumpers/DIP switches on the replacement module to match those
of the removed module.
6. Ensure that the new Scanner Module is properly aligned with the slot guides, insert the new
Scanner Module in the rack, and secure it in place with the captured screws at top and bottom of
the module.
7. Re-install the cable(s).
8. Using the external (user-supplied) switch, connect the power supply or supplies in the expansion
rack to the site AC power source. The Scanner Module should resume communications with I/O
modules in the rack and with the Controller Module with which it is connected.
9. Check status indications at the Scanner Module, at the Controller Module, and at the OI.
200
Table 36 – Scanner Module Replacement
Either ensure that powering-down the expansion rack will not have adverse
bring the process to a safe and orderly shutdown.
HC900 Process & Safety Controller User and Installation Manual
Action
Revision 6
21 April 2017