Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 148)

148 Publication 1404-UM001F-EN-P - November 2009
Chapter 7 Data Logging
Configurable Trend Log 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 communication 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 these two modes:
•
Fill and Hold - record logging continues until the log is full. You
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 power monitor logs net kilowatt-hours
(kWh), net kVAR-hours (kVarh) and demand watts, at 15-minute
intervals, in overwrite mode.
TIP
The power monitor expresses timestamps in an array of four data
table elements:
Year
Month/day
Hour/minute
Second/hundredth of a second
Each timestamp parameter (except the Year) is a combination of its
first and second element. For instance, the Month = the parameter
value divided by 100 with the remainder = the Day.
Example: 1230 = December 30
th
.