Rockwell Automation T743x-xx ICS Regent+Plus RTD Input Equipment - Manual (Page 20)

RTD Input Equipment (T7432)
2 0
Industrial Control Services
Figure 16. Wiring RTDs to Termination Panel.
Keying
The I/O chassis can be physically keyed to prevent accidental
damage caused by inserting a module into a slot wired for a
different module type. Figure 17 illustrates how the slot keys
are installed on the I/O chassis slot field wiring connectors.