Typical Applications Of Fifo Mode; Configure The Module For Fifo Mode; Choose A Communications Format; Manage The Data In Fifo Mode - Rockwell Automation Allen-Bradley ArmorBlock 1732E-IB8M8SOER User Manual

d. Once the current event is cleared from the Sequence of Events
module's buffer, data for the next transition stored in the buffer
becomes the current event, and the module begins producing this data
for the controller as described in step a.
4. The Sequence of Events module timestamps input transitions and
records the data in its on-board buffer as long as the buffer is not full.
(The module stores up to 256 events per input.)

Typical Applications of FIFO Mode

FIFO mode is intended for use in applications where multiple transitions
occur on multiple inputs in relatively rapid succession (that is, 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 256 events per input.
The following are example typical applications for FIFO mode:
• Sequence monitoring
• Process and machine optimization

Configure the Module for FIFO Mode

You configure the same general set of configurable features whether you are
using the Sequence of Events module in CIP Sync/PTP 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 Timestamp
impacts the Sequence of Events module behavior slightly differently in
CIP Sync/PTP 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 Timestamp
• Enable CIP Sync/PTP Timestamp Capture

Choose a Communications Format

During initial module configuration, you must choose a communication
format for the module. The communications format determines what
operational mode your Sequence of Events module uses and, consequently,
what tags Studio 5000 Logix Designer generates when configuration is
complete.
To operate the Sequence of Events module in FIFO mode, you must choose the
FIFO communication format, as shown below.

Manage the Data in FIFO Mode

In FIFO Mode, the Sequence of Events module sends input data for the current
event to the controller immediately after the first input transition has been
timestamped and at each RPI. You must manage the data coming from the
Sequence of Events module.
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
Chapter 10 Use the Sequence of Events Input and Scheduled Output Modules
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