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Chapter 10
Use the Sequence of Events Input and Scheduled Output Modules
1. Input 1 transitions
from OFF to ON.
68
switch FIFO retrieval modes. Make sure you do not need the data being
cleared from the module buffer prior to resetting events.
To change retrieval methods, change the O.RetrieveByPoint tag to the new
method.
•
To use the standard retrieval by time method, O.RetrieveByPoint = 0.
•
To use the retrieval by point method, O.RetrieveByPoint = 1.
Manage the Data
The module sends all of its input data to the controller the next RPI after an
input transition has been timestamped and at each subsequent RPI. You must
manage the data coming from the module.
The following occurs in the process of the managing data coming from the
module:
1. The module sends data to the controller.
2. The controller copies the relevant portions of the input data to separate
array.
3. At the user's discretion, the controller clears latched timestamp data
from the module via the O.EventAck and O.NewData tags, preparing the
module to timestamp the next transition.
This process is described in the rest of this section.
Module Sends Data to the Controller
The following figure shows an example of the module sending data to the
controller. In the example, the following occurs:
1. Input 1 transitions from OFF to ON. (The input has Timestamp Capture
enabled).
2. The module timestamps the transition.
3. The module sends its input data, including the transition timestamp
from input 1, to the controller.
1732E-IB8M8SOER
2. Module timestamps the
transition.
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 1 0 1 1 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
3. Module sends input data to the
controller.
I.Fault
I.Data
I.NewData
I.EventOverflow
I.LocalClockOffset
I.OffsetTimeStamp
I.GrandMasterClockID
I.TimeStampOffOn
I.TimeStampOnOff
I.EventNumber
I.SyncToMaster
ControlLogix controller
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