Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 34)

34 Publication 1756-UM009C-EN-P - December 2010
Chapter 2 Analog I/O Operation in the ControlLogix System
Configuration Changes in
an Input Module with
Multiple Owners You must be careful when changing an input module’s configuration data in a
multiple owner scenario. When the configuration data is changed in one of the
owners, for example, Controller A, and sent to the module, that configuration
data is accepted as the new configuration for the module. Controller B
continues to listen, unaware that any changes have been made in the module’s
behavior.
To prevent other owners from receiving potentially erroneous data, do the
following steps when changing a module’s configuration in a multiple
owner-controller scenario while online.
1. For each owner-controller, inhibit the controller’s connection to the
module, either in the software on the Connection tab or the pop-up
window warning of the multiple owner-controller condition.
2. Make the appropriate configuration data changes in the software. For
detailed information on using RSLogix 5000 software to change
configuration, see
Chapter 10 .
3. Repeat
step 1 and step 2 for all owner-controllers, making the exact same
changes in all controllers.
4. Disable the Inhibit box in each owner’s configuration.
Input Module
Configuration
Data
Xxxxx
Xxxxx
Xxxxx Input Module
Configuration
Data
Xxxxx
Xxxxx
Xxxxx
41056
Modified Configuration Initial Configuration
Controller A Controller B Input Module
A B
Controller B is unaware that changes were made by Controller A.
IMPORTANT
A pop-up screen in RSLogix 5000 software alerts you to the
possibility of a multiple owner situation and lets you inhibit the
connection before changing the module’s configuration. When
changing configuration for a module with multiple owners, we
recommend the connection be inhibited.