Rockwell Automation T3432-CA ICS Regent RTD Input Equipment - Manual (Page 20)

RTD Input Equipment (T3432)
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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.