Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module - Manual (Page 78)

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011
78 Configure the 1756-HSC Module
If you use Disabled Keying, you must take full responsibility for understanding
whether the module being used can fulfill the functional requirements of the
application.
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.
EXAMPLE In the following scenario,
Disable Keying prevents I/O
communication:
T he 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 .
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.