Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 9)

Publication 1756-UM528A-EN-P - April 2004
Table of Contents 3
Chapter 6
Using The Sequence of Events
Module in CST Per Point Mode What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 6-1
Overview of the Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
How Does the Module Store Timestamp Data in CST
Per Point Mode? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
What Are The Typical Applications Where CST Per Point
Mode is Used?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Configuring the Module for CST Per Point Mode . . . . . . . . 6-4
Choosing a Communications Format. . . . . . . . . . . . . . . 6-5
Using Latch CST in CST Per Point Mode . . . . . . . . . . . . 6-6
Using Enable CST Capture in CST Per Point Mode. . . . . 6-7
Managing the Data in CST Per Point Mode . . . . . . . . . . . . . 6-8
Module Sends Data to the Controller . . . . . . . . . . . . . . 6-8
Copying Relevant Input Data to a Separate
Data Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Acknowledging Latched Timestamp Data . . . . . . . . . . . 6-12
Sorting the Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Clearing All Data From the Module’s Buffers At Once . . . . . 6-14
Chapter Summary and What’s Next . . . . . . . . . . . . . . . . . . 6-14
Chapter 7
Using The Sequence of Events
Module in FIFO Mode What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 7-1
Overview of the Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
How Does the On-Board Buffer Work in FIFO Mode? . . . . 7-2
What the Typical Applications Where FIFO Mode is Used? . 7-4
Configuring the Module for FIFO Mode . . . . . . . . . . . . . . . 7-4
Choosing a Communications Format. . . . . . . . . . . . . . . 7-5
Using Latch CST in FIFO Mode. . . . . . . . . . . . . . . . . . . 7-6
Using Enable CST Capture in FIFO Mode . . . . . . . . . . . 7-9
Managing the Data in FIFO Mode . . . . . . . . . . . . . . . . . . . 7-10
Retrieving Data in FIFO Mode . . . . . . . . . . . . . . . . . . . 7-10
Producing Current Event Data . . . . . . . . . . . . . . . . . . . 7-14
Copying Relevant Input Data to a Separate
Data Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Acknowledging Latched Timestamp Data . . . . . . . . . . . 7-17
Clearing All Data From the Module’s Buffers At Once . . . . . 7-20
Changing Between Retrieval Methods . . . . . . . . . . . . . . . . 7-20
Chapter Summary and What’s Next . . . . . . . . . . . . . . . . . . 7-20