Rockwell Automation Publication 5094-UM001C-EN-P - April 2019 33
Digital I/O Module Operation in a Logix 5000 Control System Chapter 1
Trigger Events
A FLEX 5000 standard input module can trigger as many as four events. The
module can also trigger an Event task to execute in the owner-controller. The
event task lets you execute a section of logic immediately when an event occurs.
For more information on event tasks, see the Logix5000 Controllers Tasks,
Programs, and Routines Programming Manual, publication 1756-PM005
.
Output Module Operation
The controller sends data to an output module at the RPI or after an Immediate
Output (IOT) instruction is executed.
The RPI defines when the controller sends data to the FLEX 5000 standard
output module and when the output module echoes data. The controller sends
data to an output module only at the RPI.
At the RPI, not only does the controller send data to the output module, but also
the output module sends data to the controller. For example, the output module
sends an indication of the point data quality.
FLEX 5000 output modules reside in a FLEX 5000 I/O system that is accessible
to a Logix 5000 controller over an EtherNet/IP network. A FLEX 5000
EtherNet/IP adapter is the first component in a FLEX 5000 I/O system and
connects the system to the EtherNet/IP network.
FLEX 5000 output modules receive output data from a controller. The output
module also sends data to the controller.
Controller to Output Module Data Transmission
The controller broadcasts data to its local backplane at one of the following:
•RPI
• An IOT instruction is executed (standard I/O modules only)
Based on the RPI rate and the length of the controller program scan, the output
module can receive and echo data multiple times during one program scan.
IMPORTANT FLEX 5000 I/O safety input modules cannot trigger events.
IMPORTANT Immediate Output instruction is not supported in safety applications.
IMPORTANT The RPI for a FLEX 5000 I/O safety output module is the Safety Task period.
Safety output data is sent at the completion of the Safety Task scan.
IMPORTANT An IOT instruction sends data to all of the output modules in the
system immediately, and resets the RPI timer.
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