Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 87)

1 Publication 1756-UM528A-EN-P - April 2004
Chapter
7
Using The Sequence of Events Module in
FIFO Mode
What This Chapter Contains This chapter describes how to use the Sequence of Events module in
FIFO mode.
Overview of the Mode In First In First Out (FIFO) mode, the Sequence of Events module
timestamps multiple input transitions on any CST Capture-enabled
inputs. The module stores the timestamp data in an on-board buffer
that holds data for up to 160 unique transitions and their timestamps.
When an input transitions, the module timestamps the event and
records specific input data related to the transition. The
owner-controller must retrieve the data from the Sequence of Events
module using one of the two methods described later in this chapter.
Table 7.1
For information on: See page:
Overview of the Mode 7-1
What the Typical Applications Where FIFO Mode is Used? 7-4
Configuring the Module for FIFO Mode 7-4
Retrieving Data in FIFO Mode 7-10
Clearing All Data From the Module’s Buffers At Once 7-20
Changing Between Retrieval Methods 7-20
IMPORTANT
Keep in mind that, although the Sequence of Events
module can store data for up to 160 timestamped
transitions in its on-board buffers, if you manage the
buffer effectively (i.e., retrieve data in a timely
fashion), the module can timestamp an infinite
number of input transitions and the controller will be
able to retrieve and use the data.