Allen-Bradley 1756-L61 ControlLogix 5561 Programming Manual page 20

Chapter 1 Communicate with I/O Modules
18
In the following scenario, Disable Keying allows I/O communication:
EXAMPLE
The module configuration is for a 1756-IA16 digital input module. The physical
module is a 1756-IB16 digital input module. In this case, communication is
allowed because the two digital modules share common data formats.
Module Configuration
Vendor = Allen-Bradley
Product Type = Digital Input
Module
Catalog Number = 1756-IA16
Major Revision = 2
Minor Revision = 1
Physical Module
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16
Major Revision = 3
Minor Revision = 2
Changing electronic keying selections online may cause the I/O communication
IMPORTANT
connection to the module to be disrupted and may result in a loss of data.
Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
Communication is allowed