22 Rockwell Automation Publication 5094-UM001E-EN-P - April 2020
Chapter 1 Digital I/O Module Operation in a Logix 5000 Control System
Ownership
A controller, also known as the owner-controller, must own every I/O module in
a Logix 5000 control system. When the FLEX 5000 I/O modules are used in a
Logix 5000 control system, the owner-controller performs the following:
• Stores configuration data for every module that it owns.
• Can reside in a location that differs from the FLEX 5000 I/O modules.
• Sends the I/O module configuration data to define module behavior and
begin operation in the control system.
Each FLEX 5000 I/O module must continuously maintain communication with
its owner-controller during normal operation.
Typically, each I/O module in a FLEX 5000 I/O system has only one
owner-controller. Modules with output tags are limited to one owner-controller.
Multiple Owners of FLEX 5000 Input Modules
While typically only one owner-controller is connected to a FLEX 5000
digital input module, multiple Logix 5000 controllers can own FLEX 5000
digital input modules as owner-controllers. In this case, the following conditions
must exist:
• The controllers maintain the same configuration.
• The configuration in each controller uses a Data connection to the
input module.
• The first controller to make a connection to the input module is the only
controller that can change the configuration. Therefore, it ‘owns’ the
module configuration.
• The controllers that do maintain but do not ‘own’ the module
configuration are similar to Listen-only controllers. The difference
between the controllers is that the controllers that maintain but do not
own the module configuration can use a Multicast or Unicast connection
over the EtherNet/IP network.
For more information on Listen-only controllers, see Listen Only Mode
on page 35.
IMPORTANT If the controller that owns the module configuration changes the
configuration, the other controllers are not notified of any changes.
See Configuration Changes in an Input Module with Multiple
Owners on page 23 for more information.
STATUS
POWER
SAFETY DIGITAL 16 INPUT 24 VDC
5094-IB16S
5
5
TB3I
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
STATUS
POWER
DIGITAL 16 INPUT 24 VDC
5094-IB16
1
1
TB3
FLEX 5000
TM
I/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Safety Modules
Standard Modules
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