Configurable Trend Log - Allen-Bradley Powermonitor 3000 User Manual

7-8 Data Logging

Configurable Trend Log

Publication 1404-UM001D-EN-E - October 2004
• Password: -1
• Write type: 0
• DeviceNet unique write identifier: as applicable
• Text block #: 1
• Event record internal identifier: from Table A.27, element 1;
selects record to read
The remaining records may remain 0.
The next read of Table A.50 returns the first 26 characters in the user
comment. The next write is identical except the Text block # must be
2. The next read returns the last 24 characters in the user comment.
You can learn a great deal about, and learn how to reduce, your
enterprise's energy costs by keeping a historical record of power and
energy usage. The Configurable Trend Log allows you to set up
automatic logging of up to 16 parameters at intervals between 1
second and 1 hour. It can store over 45,000 individual records in
nonvolatile memory.
You must use communications to configure and read the Trend Log.
There is no Display Module interface for either configuration or
monitoring.
Trend Log Modes of Operation
The Trend Log operates in one of two modes:
• Fill and Hold - record logging continues until the log is full. The
user must clear the log for logging to continue.
• Overwrite - logging operates in first-in, first-out mode whereby
each new record overwrites the oldest record. The trend log
always contains the most recent records.
Default configuration:
As shipped from the factory, a Powermonitor 3000 will log net
kilowatt-hours (kWh), net kVAR-hours (kVarh) and demand watts, at
15-minute intervals, in overwrite mode.