Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM - Manual (Page 80)

70 Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014
Chapter 10 Use the Sequence of Events Input and Scheduled Output Modules
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 CIPSync/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 CIPSync/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 CIPSync/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 RSLogix 5000
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.