Allen-Bradley CompactLogix 5480 User Manual

Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 177
Use I/O Modules Chapter 7
Determine When Data
Is Updated
CompactLogix 5480 controllers update data asynchronously with the
execution of logic. See the following flowcharts to determine when a controller,
input module, or bridge sends data:
•
Input Data Update Flowchart
•
Output Data Update Flowchart
Input Data Update Flowchart
Method of Input Data Production
Digital without events, analog without RTS, produced tag
Produced tag with data state change events
Digital with Events Enabled
Analog with RTS Enabled
RTSRPI?
Yes
No
The module sends data at the RTS.
The module sends data at
the RTS and RPI.
New data can appear in Input tags at any point in the program scan. If the
control logic reads input tag values in multiple locations, do not assume
that the data remains unchanged throughout the scan of the logic.
Data is sent by the module or the
producing controller at the RPI.
Data is sent by the producing controller at the RPI and
when an Immediate Output (IOT) instruction executes.
The Event task in a consuming controller is only
triggered when an IOT instruction is executed in the
producer.
Data is sent by the module at the RPI
and at the change of a specified point.

Allen-Bradley CompactLogix 5480 Specifications

General

Brand	Allen-Bradley
Model	CompactLogix 5480
Category	Controller
Language	English