Siemens SENTRON PAC3100, Manual, Page: 22 / 152

Description
3.4 Power demands and counters
SENTRON PAC3100
22
Manual, 07/2009, A5E02385159B-01
3.4 Power demands and counters
3.4.1 Acquisition of power demand
Values that can be read out
SENTRON PAC3100 supplies the power demand of the last completed measuring period:
●
Mean values for active power and reactive power, separated in each case for import and
export
● Minimum and maximum active power and reactive power
● Length of the demand period in seconds. The period may be shorter for reasons of
external synchronization.
● Time in seconds since the last synchronization or since completion of the last period.
Example: Period length and length of the demand period
Period length: 15 minutes; time of day: 13:03; time in seconds: 180 s.
The following can be calculated from this: The last demand period ended at 13:00. The
active demand period will end at 13:15 or in 12 minutes.
Availability
Note
The power demand of the last measuring period can only be fetched during the current
measuring period.
Note
The power demand can only be read out via the RS 485 interface. The values are not shown
on the display.
You can find more information on accessing the data via MODBUS in the Appendix.
Adjustable parameters
● Time interval in minutes: 1 to 60 min adjustable, default 15 min
● Synchronization via RS 485 interface
See also
Modbus RTU (Page 125)