Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 75)

Publication 1756-UM528A-EN-P - April 2004
Using The Sequence of Events Module in CST Per Point Mode 6-3
When the Sequence of Events module operates in CST Per Point
mode, generally the following occurs:
1. You configure the Sequence of Events module to operate in
CST Per Point mode via the Communication Format selection.
2. The Sequence of Events module timestamps each transition
for inputs that are Enable CST Capture-enabled. The module can
timestamp each transition with a unique CST with 25
µs
resolution.
3. The module sends all of its input data, including the new data
from the most recent transition, to the controller immediately
after timestamping the transition and passing the input filter to
make sure the transition was valid.
4. You copy new data from the controller tags to a separate data
structure for later sorting.
5. Once the data is copied to a separate data structure, you may
sort the data in the controller to determine the order of events.
Some of these typical events are described in greater detail in the
rest of this chapter.