Hardware reference guide

I/O Modules
498
35013379 02 October 2007
Field Wiring
Terminal Strip/
Module Keying
Assignments
Field wiring terminal strips and module housings are slotted on the left and right
sides of the PCB card slot to accept keying pins (see I/O Module figure). The
purpose of keying is to prevent plugging the terminal strip into the wrong module,
once wiring connections have been made. Keying is implemented at the discretion
of the user.
Primary keying is provided on the right side of the module, marked A through F (top
and bottom positions are coded the same). Primary keying provides module class
coding. Primary codes have been pre-defined (see the following chart).
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.
Safety precaution
For maximum safety and protection, Modicon recommends that module key coding
be part of the system installation procedure.
Failure to follow these instructions can result in injury or equipment damage.
CAUTION
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com