Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 108)

108 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 6 Install ControlLogix Isolated Analog I/O Modules
Key the Removable
Terminal Block Key the removable terminal block (RTB) to prevent inadvertently connecting the
wrong wiring in the RTB to your module. Wedge- and U-shaped bands are
manually inserted into the RTB and module. This process hinders a wired RTB
from being accidentally inserted into a module that does not match the
positioning of the respective tabs.
Key positions on the module that correspond to unkeyed positions on the RTB.
For example, if you place a U-shaped keying band in slot 4 on the module, you
cannot place a wedge-shaped tab in slot 4 on the RTB or your RTB does not
mount on the module. We recommend that you use a unique keying pattern for
each slot in the chassis.
Complete the following steps to key the RTB.
1. Insert the U-shaped band with the long side near the terminals.
2. Push the band onto the module until it snaps into place.
3. Key the RTB in positions that correspond to unkeyed module positions.
4. Insert the wedge-shaped tab on the RTB with the rounded edge first.
5. Push the tab onto the RTB until it stops.
U-shaped Keying
Band
20850-M
Wedge-shaped
Keying Tab
Module Side of the RTB
0
1
2 3
4
5 6
7 20851-M