Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 102)

Publication 1756-UM528A-EN-P - April 2004
7-16 Using The Sequence of Events Module in FIFO Mode
Figure 7.3 shows when to use the COP or CPS instruction. In this
example, the Sequence of Events module has produced current event
data for the controller at the RPI.
The controller copies the relevant input data from the controller tags
to a separate data structure.
Figure 7.3
Figure 7.4 shows an example of ladder logic in which the controller
only moves the input number (I.EventPoint) and copies the CST
timestamp (I.CSTTimestamp) from the controller tags to a separate
data structure named Fifo_ExtractData[Index].
Figure 7.4
0 1 1 0 0 1 0
1 1 0 0 1 1 0
0 1 0 0 0 1 0
1 1 0 0 1 1 0
1 0 1 0 0 1 0
1 1 0 0 1 1 0
1 0 1 0 0 1 1
0 0 0 0 1 1 0
1 1 0 0 1 0 1
1 0 0 1 1 1 0
1 1 1 0 0 1 1
I.Fault
I.EventOverlow
I.EventNumber
I.CSTTimestamp[2]
I.UCTTimestamp[2]
I.EventPoint
I.Data
I.NewData
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2. Module produces
current event data.
Sequence of Events module ControlLogix controller
1. Module stores data
in on-board buffer.
Current event
I.EventData
I.ReturningUCTTime
I.EventsQueuedCount
I.Fault
I.EventOverlow
I.EventNumber
I.CSTTimestamp[2]
I.UCTTimestamp[2]
I.EventPoint
I.Data
I.NewData
I.EventData
I.ReturningUCTTime
I.EventsQueuedCount
Controller tags
Separate array
3. Controller
copies
relevant
data from
controller
tags to a
separate
array.