Rockwell Automation Allen-Bradley 1734-232ASC Original Instructions Manual page 14

Chapter 1 Overview of the POINT I/O ASCII Modules
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Table 5 shows the Electronic Keying options that are available.
Table 5 - Electronic Keying Options
Keying Option Description
Lets the installed device accept the key of the device that is defined in the project when the
installed device can emulate the defined device. With Compatible Module, you can typically
replace a device with another device that has the following characteristics:
• Same catalog number
Compatible Module
• Same or higher Major Revision
• Minor Revision as follows:
– If the Major Revision is the same, the Minor Revision must be the same or higher.
– If the Major Revision is higher, the Minor Revision can be any number.
Indicates that the keying attributes are not considered when attempting to communicate with a
device. With Disable Keying, communication can occur with a device other than the type specified
in the project.
ATTENTION: Be extremely cautious when using Disable Keying; if used incorrectly, this option can
Disable Keying
lead to personal injury or death, property damage, or economic loss.
We strongly recommend that you do not use Disable Keying.
If you use Disable Keying, you must take full responsibility for understanding whether the device
being used can fulfill the functional requirements of the application.
Indicates that all keying attributes must match to establish communication. If any attribute does
Exact Match
not match precisely, communication with the device does not occur.
Carefully consider the implications of each keying option when selecting one.
Rockwell Automation Publication 1734-UM009C-EN-P - August 2022