Allen-Bradley 1756 ControlLogix User Manual

Chapter 3
Configure a ControlNet Module
40 Rockwell Automation Publication CNET-UM001F-EN-P - February 2018
Electronic Keying reduces the possibility that you use the wrong device in a
control system. It compares the device defined in your project to the installed
device. If keying fails, a fault occurs.
The following attributes are compared:
Attribute Description
Vendor The device manufacturer.
Device Type The general type of the device, for example, digital I/O
module.
Product Code
The specific type of device. The Product Code
maps to
a catalog number.
Major Revision
A number that represents the functional capabilities of a
device.
Minor Revision A number that represents behavior changes in the
device.
The following Electronic Keying options are available:
Keying Option Description
Compatible Module 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
• 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.
Disable Keying 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 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.
Exact Match Indicates that all keying attributes must match to
establish communication. If any attribute does not
match precisely, communication with the device does
not occur.
Carefully consider the implications of each keying option when selecting
one.
Electronic Keying

Allen-Bradley 1756 ControlLogix Specifications

General

Brand	Allen-Bradley
Model	1756 ControlLogix
Category	Controller
Language	English