Rockwell Automation T3404 ICS Regent AC Digital Input Module 110 VAC - Manual (Page 10)

AC Digital Input Module (T3404)
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Industrial Control Services
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 7 illustrates how the slot keys
are installed on the I/O chassis slot field wiring connectors.
The slot key positions for the AC digital input module are
listed in Table 1.
Figure 7. Installing Slot Keys.