Key The Module And Removable Terminal Block/Interface Module - Allen-Bradley ControlLogix 1756-IG16 Installation Instructions Manual

Key the Module and Removable Terminal Block/Interface Module

Use the wedge-shaped keying tabs and U-shaped keying bands to
prevent connecting the wrong wires to your module.
Key positions on the module that correspond to unkeyed positions
on the RTB. For example, if you key the first position on the module,
leave the first position on the RTB unkeyed.
1. To key the module, insert the U-shaped band, as shown.
2. Push the band until it snaps in place.
3. To key the RTB or IFM, insert the wedge-shaped tab with
rounded edge first, as shown.
4. Push the tab until it stops.
Reposition the tabs to rekey future module applications.
ControlLogix TTL Input Module 9
U-shaped
bands
20850–M
Wedge-shaped tab
20851–M
Publication
1756-IN584B-EN-P - August 2003