Honeywell HC900 manual Replacing the Scanner Module, Scanner Module Replacement

Removal and Replacement Procedures - Safety Considerations - PLAN AHEAD!

Replacing the Scanner Module

Removing and replacing the Scanner Module from an I/O expansion rack(C50 CPU 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.

	Table 33 - Scanner Module Replacement
Step	Action
1.	If a process is currently in operation, then:
	Either:
	- Ensure that powering-down the expansion rack will not have adverse consequences on any
	running process.
	Or:
	- Bring the process to a safe and orderly shutdown.
2.	Using an external (user-supplied) switch, disconnect the power supply in the expansion rack
	from the site AC power source.
3.	Unplug the 10Base-T cable from the scanner.
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 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 10Base-T cable.
8.	Using the external (user-supplied) switch, connect the power supply 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.

Revision 5	HC900 Hybrid Controller Installation and User Guide	149
9/03