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Configure a ControlNet Module Chapter 3
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
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.
ATTENTION: Be extremely cautious when using Disabled Keying;
if used incorrectly, this option can lead to personal injury or death,
property damage, or economic loss.
Rockwell Automation Publication CNET- UM001E-EN-P - June 2016
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