Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules - Manual (Page 113)

Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 113
Install ControlLogix I/O Modules Chapter 6
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, do not
insert a wedge-shaped tab in slot 4 on the RTB, or your RTB will not mount on
the module. We recommend that you use a unique keying pattern for each slot in
the chassis.
Follow these steps to key the RTB.
1. To key the module, insert the U-shaped band with the longer side near the
terminals.
2. Push the band onto the module until it snaps into place.
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