Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 74)

Publication 1756-UM528A-EN-P - April 2004
6-2 Using The Sequence of Events Module in CST Per Point Mode
How Does the Module
Store Timestamp Data in
CST Per Point Mode? With each timestamped transition, the Sequence of Events module
stores data for that point. An overview of how the module stores
timestamp data in CST Per Point mode is shown in Figure 6.1:
Figure 6.1
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 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 1 0 1 1 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
1 1 0 0 1 0 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 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
43793
Input 0
OFF/ON timestamp data
ON/OFF timestamp data
Input 1
Input 2
Input 15
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
OFF/ON timestamp data
ON/OFF timestamp data
Input 0
Input 1
Input 2
Input 15
Input 0
Input 1
Input 2
Input 15
The module is installed, wired to input
devices and ready to begin operation. All
inputs are configured to timestamp any
transition that occurs.
At this point, timestamp data for each
input is 0 because no input transitions
have occurred.
Note that only 8 bits of the 64-bit CST
timestamp are shown.
Input 1 transitions from OFF to ON.
The module timestamps the transition;
the module sends the data to the
owner-controller (not shown) and also
stores it locally.
Input 2 transitions from ON to OFF.
The module timestamps the transition;
the module sends the data to the
owner-controller (not shown) and also
stores it locally.
Note that the module continues to store
the timestamp for the OFF to ON
transition on input 1.