Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 22)

22 Rockwell Automation Publication 1756-UM533C-EN-P - February 2011
Chapter 1 ControlLogix HART Analog I/O Modules
If you use Disabled keying, you must take full responsibility for understanding
whether the module that is being used can fulfill the functional requirements of
the application.
EXAMPLE In the following scenario, Disable keying prevents I/O communication:
The module configuration is for a 1756-IA16 digital input module. The physical module is a 1756-IF16 analog input
module. In this case, communication is prevented because the analog module rejects the data formats that the
digital module configuration requests.
EXAMPLE In the following scenario, Disable keying allows I/O communication:
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 = 3
Minor Revision = 1
Physical Module
Vendor = Allen-Bradley
Product Type = Analog Input
Module
Catalog Number = 1756-IF16
Major Revision = 3
Minor Revision = 2
Communication is prevented.
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
Communication is allowed.