Siemens SENTRON PAC4200, Руководство пользователя, Страница: 33 / 252

Description
3.4 Load profile
SENTRON PAC4200
Manual, 09/2008, A5E02316180B-01
33
Accessing the load profile memory
● The complete load profile memory can be read out.
● A definable number of periods can be read out starting at a definable period number.
● The complete load profile memory can be cleared.
Storage concept of the load profile memory
The memory of SENTRON PAC4200 is designed as a circular buffer. If the maximum
available memory is exceeded, the oldest data is overwritten by the newest data.
Storage capacity of the load profile memory
The data volume that occurs when a load profile is recorded depends on the length of the
period.
SENTRON PAC4200 can record load profile data for the following configuration over a
period of 40 days:
●
Fixed block:
Length of the demand period: 15 minutes
● Rolling block:
Length of the subperiods: 15 minutes
This corresponds to a maximum of 3840 recorded periods.
This calculation applies to the ideal case in which the actual period length is identical to the
configured length for all periods over the complete load profile recording time. Any deviations
between the actual and configured period lengths additionally increase the data volume.
3.4.3 Current load profile data at the communication interfaces
Current load profile data
SENTRON PAC4200 supplies the load profile data for the current and instantaneous periods
at the communication interfaces.
●
The current period is the last completed period.
● The instantaneous period is the period still in progress and has not yet been completed.
You can find more information on accessing the data via MODBUS in the Appendix.
See also
Measured variables for the load profile with the function codes 0x03 and 0x04 (Page 206)