Averaging Measured Values; Power Demands And Counters; Acquisition Of Power Demand - Siemens SENTRON PAC3200T Product Manual

Description

2.3 Averaging measured values

2.3 Averaging measured values
Instantaneous values are averaged over defined time periods in order to generate measured
value profiles. The average values can be read out and stored for this purpose. This reduces
the communication load and the storage requirements on downstream servers.
The PAC3200T device has two average value generators, which can be parameterized
independently.
The aggregation of the measured values reduces the bus load without risk of losing
information. Average values are calculated contiguously, based on the underlying values.
After expiry of the set time period, the values are updated each time.
• The default setting for average value 1 is a period of 10 seconds.
• The default setting for average value 2 is a period of 15 minutes.
The period length can be set to anything between 3 seconds and 1 year.
The list of available measured values can be found in appendix Active energy history with
Modbus function code 0x14 (Page 109).
2.4

Power demands and counters

2.4.1

Acquisition of power demand

Values that can be read out
PAC3200T 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 within the last measuring
period.
• 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.
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Equipment Manual, 09/2022, L1V30415168B-03