5.1 DIN Rail Method
5.1.5 Replacing and Adding Option Modules
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2. Remove the Option Module Cover
Insert the protruding part of the battery cover into the slot on top of
the panel of the Option Module to unhook, as shown in the
diagram. Face the front of the battery cover towards you for this
operation.
Remove the front cover from the empty slot before mounting an Option
Module in an empty slot.
Unhook the bottom in the same way.
3. Remove the Option Module from the mounting base.
Remove the top panel of the option module by pulling it towards
you. A notch on the Option Module will be visible from the gap in
the cover. Hook the round knob on the battery cover into the
notch in the Option Module.