Configure a ControlNet Module
44 Rockwell Automation Publication CNET-UM001F-EN-P - February 2018
Example In the following scenario, Compatible Keying allows I/O communication:
The module configuration is for a 1756-IB16D module with module revision
2.1. The physical module is a 1756-
IB16D module with module revision 3.2.
In this case, communication is allowed because the major revision of the
physical module is higher than expected and the module determines that it
is compatible with the prior major revision.
Module Configuration:
Vendor = Allen-Bradley
Product Type = Digital Input
Module
Catalog Number = 1756-IB16D
Major Revision = 2
Minor Revision = 1
Communication is allowed.
Physical Module:
Vendor = Allen-Bradley
Product Type = Digital Input
Module
Catalog Number = 1756-IB16D
Major Revision = 3
Minor Revision = 2
Important:
Changing electronic keying selections online may cause the I/O communication connection to the module to
be disrupted and may result in a loss of data.
Disabled Keying indicates the keying attributes are not considered when
attempting to communicate with a module. Other attributes, such as data size
and format, are considered and must be acceptable before I/O communication
is established. With Disabled Keying, I/O communication may occur with a
module other than the type specified in the I/O Configuration tree with
unpredictable results. We generally do not recommend using Disabled
Keying.
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