Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 31)

Installing the Module 2-9
The 1769-SM2 module can be replaced while the system is mounted to a
panel (or DIN rail).
1. Remove power.
2. Unplug the communications cable from each port (CH1, CH2, CH3)
on the 1769-SM2 module. Note each drive and the port to which it is
connected.
3. Remove the upper and lower mounting screws from the module (or
open the DIN latches using a flat-blade screwdriver).
4. On the right-side adjacent module, move its bus lever to the right
(unlock) to disconnect it from the module being removed.
5. Gently slide the disconnected 1769-SM2 module forward.
If you feel excessive resistance, make sure that you disconnected the
module from the bus and that you removed both mounting screws (or
opened the DIN latches).
6. Before installing the replacement 1769-SM2 module, be sure that the
bus lever on the right-side adjacent module is in the unlocked (fully
right) position.
7. Slide the replacement 1769-SM2 module into the open slot.
Replacing the Module within a System
!
ATTENTION: Risk of equipment damage exists. Remove power
before installing or removing the 1769-SM2 module. When you install
or remove the module with power applied, an electrical arc may occur.
An electrical arc can cause personal injury or equipment damage by:
•
Sending an erroneous signal to your system’s field devices, causing
unintended machine motion.
•
Causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the module
and its mating connector. Worn contacts may create electrical
resistance.
TIP: 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.