Average Values And Counters; Averaging Measured Values - Siemens SENTRON PAC3120 Manual

2.3

Average values and counters

2.3.1

Averaging measured values

Based on selected recordings of measured values over time, the user can optimize the
system in accordance with requirements (e.g. with respect to energy consumption), and
comply with normative requirements relating to power and energy recordings. For this
purpose, instantaneous values need to be read out via the communication port, calculated
and stored. The uninterrupted recording that is necessary requires a high bandwidth, high
availability of communication and high storage capacity.
The power monitoring device generates all the measured values every 200 ms
approximately. The device therefore features two internal average value generators which
can be parameterized independently of each other. The time averages formed in the device
are generated continuously based on all the associated values.
The values are updated after expiry of the set time period in each case.
● 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 can be set to anything between 3 seconds and 31536000 seconds (1 year).
The function is available only via communication interfaces.
A list of available measured values can be found in chapter Demand value measured
variables with Modbus function code 0x14 (Page 140).
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
Description
2.3 Average values and counters
21