Operation Manual

33
DL451 Modular I/O
Operator Manual
Appendix D: Replacing An I/O Module
This appendix provides instructions on replacing an module on the rear panel of the
DL451 Modular I/O.
Replacing a module
The design of the DL451 Modular I/O makes module replacement very easy and
straightforward. The unit has rack guides in each of the three module positions so that
the modules can slide easily in and out. Each module is held in place by two screws, at
the left and right sides. A short metal post (or stud) adjacent to each screw facilitates
removal.
>> To remove a module
1 Switch off the unit and isolate it electrically from the mains power supply by
switching off the mains power supply at the mains outlet and removing the mains
power cable from the rear of the unit.
2 Unplug all cables from the rear of the unit.
3 On the module you are replacing, remove the two securing screws from its left
and right sides on the rear panel (circled below).
4 Pull out the module using the two circular machined posts (fitted to rear of
module panel, adjacent to the two securing screws).
>> To fit a module
Carefully insert the module into the empty module slot, ensuring the correct
orientation, and secure the module in place using the two securing screws (left and
right). Then, plug in all the cables to the rear panel of the unit. Finally, plug in the
mains cable and switch the unit on.