User Manual

32 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 2 ControlLogix Isolated Analog I/O Module Features
EXAMPLE
In the following scenario, Compatible keying lets I/O
communication occur:
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.
IMPORTANT
Changing electronic keying selections online can cause the I/O
communication connection to the module to be disrupted and can result in
a loss of data.
Module Configuration
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 2
Minor Revision = 1
Physical Module
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 3
Minor Revision = 2
Communication is allowed
ANALOG INPUT
ST 0 1 2 3 4 5 6 7
ST 8 9 10 11 12 13 14 15
O
K
CAL
OK
OKFORCE SDRUN
Logix5575
R
U
N
R
E
M
P
R
O
G
DC INPUT
DC INPUT
FLT 8 9101112131415
ST01234567
ST 8 9 10 11 12 13 14 15
O
K
FLT 0 1 2 3 4 5 6 7
DIAGNOSTIC