Energy Counters; How The Energy Meter Works - Siemens SIMATIC ET 200SP Manual

Energy counters

7.1

How the energy meter works

Introduction
The AI Energy Meter 400VAC ST provides 42 energy counters that detect both line-based
and phase-based energy values.
● Active energy (total, outflow, inflow)
● Reactive energy (total, outflow, inflow)
● Apparent energy (total)
How energy recording works
Based on the measured currents and voltages and the calculation cycle the Energy Meter
calculates the active, reactive and apparent energy. The active, reactive and apparent
energies are updated in each calculation cycle.
Configuring
You configure the following settings for the energy counters:
● Activation of the gate for the energy counter
The gate allows you to start and stop the counters via output data (DQ bit). If you
deactivate the gate, the count starts immediately when the Energy Meter is switched on.
● Modes of the energy counters
The energy counter count endlessly.
The settings apply to the energy counter of all phases.
Changing properties in RUN
You can change the following properties of energy counters in runtime:
● Enable / disable energy counter
● Reset energy counter
● Set initial values for the energy counter
Analog input module AI Energy Meter 400VAC ST (6ES7134-6PA01-0BD0)
Manual, 10/2017, A5E36061895-AB
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