Spectrum Controls 1769sc-IF8u - Manual (Page 34)

24 Compact IO ™ Universal Input module
Replacing a Single
Module within a
System
The module can be replaced while the system is mounted to a panel (or
DIN rail). Follow these steps in order:
1. Remove power. See important note at the beginning of this chapter.
2. On the module to be removed, remove the upper and lower
mounting screws from the module (or open the DIN latches using a
flat-blade or phillips-style screwdriver).
3. Move the bus lever to the right to disconnect (unlock) the bus.
4. On the right-side adjacent module, move its bus lever to the right
(unlock) to disconnect it from the module to be removed.
5. Gently slide the disconnected module forward. If you feel excessive
resistance, check that the module has been disconnected from the
bus, and that both mounting screws have been removed (or DIN
latches opened).
NOTE: It may be necessary to rock the module slightly from front to
back to remove it, or, in a panel-mounted system, to loosen the screws
of adjacent modules.
6. Before installing the replacement module, be sure that the bus lever
on the module to be installed and on the right-side adjacent module
or end cap are in the unlocked (fully right) position.
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers
on the replacement module and the right-side adjacent module.
9. Replace the mounting screws (or snap the module onto the DIN
rail).