Siemens SIMATIC ET 200SP Manual page 38

Energy counters
7.1 How the energy meter works
Automatic reset of the energy counter
The energy counters are automatically reset to "0" when parameter settings relevant to the
energy counter are changed. In the case of phase-specific changing of parameter settings
relevant to the energy counter only the energy counters of the respective phases are reset.
Changing of the following parameters results in resetting of the energy counters:
● Measurement type or range
● Current transformer (primary current/secondary current)
● Direction of current
Example
The following figure shows the effect of initial value, reset and start/stop parameters with
activated gating using the energy counter as an example:
①
The counter is reset to the value specified in the configuration. The gate is closed. The counter does not count.
②
The gate is opened via the control byte 1 in the output data of the user data variant. The counter counts.
③
The configured current low limit has been violated. The counter does not count.
④
The gate is closed. The counter does not count. A new start value is written to the measured value data record 143
with the WRREC instruction.
⑤
The gate is opened again via the control byte 1 in the output data of the user data variant. The counter counts with
the new start value.
⑥
The counter is reset via the control byte 1 in the output data of the user data variant. The counter counts from the
new start value that was transferred via the measured value data record 143.
See also
Evaluating energy counters (Page 41)
38
Analog input module AI Energy Meter 400VAC ST (6ES7134-6PA01-0BD0)
Manual, 10/2017, A5E36061895-AB