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Timestamping is a feature that registers a time reference to a change in input
data. For the 1732E-IB8M8SOER, the time mechanism used for timestamping
is (PTP) system time. The 1732E-IB8M8SOER module is a PTP slave-only
device. There must be another module on the network that functions as a
master clock.
High Performance Sequence of Events Applications in the Logix
Architecture
Sequence of Events (SOE) applications span a wide range of industry
applications. Typically any event that needs to be compared against a second
event can be classified as SOE:
•
Used on discrete machines to identify failure points.
•
Used in Power Substations or power plants to indicate first fault
conditions.
•
Used in SCADA applications to indicate pump failures or other discrete
events.
•
Used in motion control applications to increase control coordination.
•
Used in high speed applications.
•
Used in Global Position Registration.
In today's environment, specifications for SOE applications typically require
1 ms or better resolution on timestamps. There are two types of SOE
applications.
•
First Fault – measures the time between events with no correlation to
events outside of that system.
•
Real Time – captures the time of an event occurrence as it relates to some
master clock. Typically this is a GPS, NTP server or some other very
accurate clock source. This method allows distributed systems to capture
events and build a history of these events. These events are almost always
digital, however some are analog for which lower performance
requirements can be configured.
First Fault Detection
An example of first fault detection would be intermittent failure from a sensor
on a safety system faults a machine and halts production cascading a flood of
other interrelated machine faults. Traditional fault detection or alarms may
not appear in the correct timed order of actual failure making root cause of the
down time difficult or impossible.
Time Stamped I/O
High precision timestamps on I/O allows very accurate first fault detection
making it easy to identify the initial fault that caused machine down time.
Common Time base for Alarming System logs user interaction as well as alarm
events using common time reference.
The power industry requires sub 1 ms accuracy on first fault across
geographically dispersed architecture.
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
Chapter 2
Module Overview and Features
15
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