Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 90)

Publication 1756-UM528A-EN-P - April 2004
7-4 Using The Sequence of Events Module in FIFO Mode
What the Typical
Applications Where FIFO
Mode is Used? FIFO mode is intended for use in applications where multiple
transitions occur on multiple inputs in relatively rapid succession (i.e.,
faster than the controller can acknowledge the data as the transitions
occur). Because of this intention, the Sequence of Events module uses
an on-board buffer to store the data for up to 160 events.
The following are example typical applications for FIFO mode:
• Sequence monitoring
• Process and machine optimization
Configuring the Module for
FIFO Mode You configure the same general set of configurable features
(described in Chapter 5) whether you are using the Sequence of
Events module in CST Per Point mode or FIFO mode. However, for
some features, the module behavior as dictated by the feature, varies
according to operational mode. For example, Latch CST impacts the
Sequence of Events module behavior slightly differently in CST Per
Point mode than in FIFO mode.
You should be aware of the impact the following configurable
features have on module behavior in FIFO mode:
• Communications Format
• Latch CST
• Enable CST Capture