Honeywell ControlEdge 900 platform Hardware Planning And Installation Manual page 163

5. Insert the screwdriver tip into the extraction tab on the front of the
module cover, and rotate the screwdriver handle toward the back,
using the top edge of the rack as a fulcrum.
6. Verify that the replacement module is of the proper type. Then,
carefully insert it into the slot in the rack so as to make proper
contact with the connector in the backplane.
7. Replace the terminal block on the module.
8. If the rack was powered-down for the procedure, restore power to
the rack.
9. Re-connect signals to field devices.
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