Allen-Bradley Powermonitor 3000 User Manual page 143

Allen-Bradley HMIs
Setting up the Trend Log
You configure the Trend Log by performing a table write to
Table A.21 with the desired configuration settings. This read/write
data table contains 26 integer elements including:
• Password: Required to configure logging, you may use -1 for
read-back selection
• DeviceNet unique write identifier
• Read-back mode: See below; must be a valid entry even if
read-back is not being selected at this time
• Logging interval: Interval in seconds (1 to 3,600). 0 disables
logging but does not disable setpoint-triggered logging; -1
synchronizes logging with demand interval.
• Logging mode: 0 selects overwrite mode; 1 selects fill and hold.
• Clear log command: 0 takes no action; 1 clears the trend log.
• Parameter selections: You may select up to 16 parameters from
the list in Table A.59 to be logged. An entry of 0 selects no
parameter; only parameters preceding the first 0 in the table will
be logged.
• Reserved elements: Must be 0
• Total records logged: These read-only elements are ignored
during a write
Although you may configure up to 16 Trend Log
TIP
parameters on units with optional DeviceNet
communications, the results table will return only the
first 8.
The Powermonitor 3000 clears the trend log when you change any
parameter or the logging interval.
You may perform a simple table read of Table A.21 to view the
existing Trend Log configuration. When you read this table, the
password element returns a value of -1 and the reserved and
command elements return a value of 0. Elements 7 and 8 return the
Total Records Logged * 1000 and * 1 respectively.
Data Logging
Publication 1404-UM001D-EN-E - October 2004
7-11