Rockwell Automation 1756-CFM ControlLogix Configurable Flowmeter Module - Manual (Page 19)

19 Rockwell Automation Publication 1756-UM010B-EN-P - December 2011
Configurable Flowmeter Operation in the ControlLogix System 19
Ownership
Every CFM module in the ControlLogix system must be owned by a
Logix5550
®
Controller. The owner-controller:
 stores configuration data for every CFM module that it owns.
 can be local or remote in regard to the I/O module’s position.
 sends configuration data to the CFM module to define the module’s
behavior within the control system.
Each CFM module continuously maintains communication with its owner
during normal operation. When connections are severed or compromised, the
CFM module performs as configured, either setting all outputs to reset (ON or
OFF) or continuous operations.
Other controllers may also listen to the CFM module (while another controller
owns the module) through a listen-only connection. For more information on
listen-only connections, see
page 22 .
Using RSNetWorx and
RSLogix 5000 Software
The I/O configuration portion of RSLogix™ 5000 software generates
configuration data structures and tags for that CFM module, whether the
module is located in a local or remote chassis. A remote chassis, also known as
networked, contains the CFM module but not the module’s owner-controller.
After creating the CFM module, you can write specific configuration in the
module’s data structures; you must access the module tags to change
information in the data structures. This process is explained in detail in
Chapter 5,
Configuring the Configurable Flowmeter Module .
IMPORTANT
Application-specific configuration data is transferred to the
controller during the program download and sent to the
CFM module during the initial power-up. After CFM
module operation has begun, you must use ladder logic and
message instructions to make configuration changes.