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Chapter 7
Common Features of the 1732E-IB8M8SOER and 1732E-OB8M8SR Modules
Electronic Keying
Table 6 - Keying Options
Keying option
Definition
Exact Match
All of the parameters listed above must match or the inserted module rejects a connection to the controller.
The Compatible Module mode allows the module to determine whether it can emulate the module defined in the configuration sent from the
controller. Some modules can emulate older revisions. The module will accept the configuration if the configuration's major.minor revision is less
than or equal to the physical module's revision.
Compatible Module
For example, if the configuration contains a major.minor revision of 1.7, the module must have a firmware revision of 1.7 or higher for a
connection to be made. When a module is inserted with a major.minor revision that is less than the revision configured (that is, the module has a
revision of 1.6 and the slot is configured for a module with revision 1.8), no connection is made between the controller and the I/O module.
Disable Keying
The inserted module attempts to accept a connection to the controller regardless of its type.
If keying is disabled, a controller makes a connection with most modules of the same type as that used in the configuration.
A controller will NOT establish a connection if any of the following conditions exist, even if keying is disabled:
• The module is configured for one module type (for example, input module) and a module of another type (for example, output module) is used.
• The module cannot accept some portion of the configuration. For example, if a non-diagnostic input module is configured for a diagnostic
input module, the controller cannot make a connection because the module will not accept/process the diagnostic configuration.
48
Electronic keying allows the ControlLogix system to control what modules
belong in the configured system.
During module configuration, you must choose one of the following keying
options for your module:
•
Exact Match
•
Compatible Module
•
Disable Keying
When the controller attempts to connect to and configure a module (for
example, after program download), the module compares the following
parameters before allowing the connection and configuration to be accepted:
•
Vendor
•
Product Type
•
Product Code
•
Major Revision – Change that affects the module function or Studio 5000
Logix Designer interface.
•
Minor Revision – Change that does not affect the module's intended
function or Studio 5000 Logix Designer interface.
The comparison is made between the keying information present in the
module and the keying information in the controller program, preventing the
inadvertent operation of a system with the wrong module. For example, if you
select Exact Match and a module with revision 1.2 is placed in a location
configured for a module with revision 1.4, the controller does not make a
connection to the new module because of the mismatched revisions.
Table 6
describes the keying options available with your module.
WARNING: Be extremely cautious when using the disable keying option; if used
incorrectly, this option can lead to personal injury or death, property damage or
economic loss.
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
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