Hardware reference guide

I/O Modules
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35013379 11/2011
Secondary keying is provided on the left side of the module, marked 1 through 6.
Secondary keying codes are user-definable and may be used to identify module
personality within module classes, or other unique site requirements.
The following figure shows the I/O module keying assignments.
NOTE: The primary/secondary keys shown (in black) in this example reflect the
recommended coding of a 24 Vdc module in slot 6 to its field wiring terminal strip.
To support keying, all I/O modules accepting terminal strips come with 12 customer-
installable primary keys (six yellow keys each for the module and terminal strip) and
six secondary keys (three white keys each for the module and terminal strip). In the
following table, check the Primary Module and Terminal Strip Coding columns for
key locations.