Energy counters
7.3 Evaluate energy counter and overflow counter
Analog input module AI Energy Meter 480VAC ST (6ES7134-6PA20-0BD0)
Manual, 12/2015, A5E36061895-AA
47
Set and reset start value
The counters can be set to their start value via the output data of each user data variant.
With energy counters, you have to reset the bit of the energy counter in control byte 2 of the
data record 143.
You can reset each energy counter to the start value or also specify a new start value via the
data record 143. You define the moment for updating of the start values in the data record
143 and in Control byte 1 in the user data. Start values are either applied immediately or
after a reset bit has been set from 0 to 1.
You can find a detailed description for this in section Resetting energy counters and overflow
counters (Page 48).
Evaluate energy counter and overflow counter
Evaluate energy counter and overflow counter
The energy counters are evaluated by
● Using the input data of the user data variants for energy
– User data variant "Total energy L1 L2 L3" (ID 249 or F9
H
)
– User data variant "Energy L1" (ID 248 or F8
H
)
– User data variant "Energy L2" (ID 247 or F7
H
)
– User data variant "Energy L3" (ID 246 or F6
H
)
● Using the input data of the user-defined user data variant with the use of the respective
measuring value IDs for energy counters
● By reading data records
– "Data record for basic measured values (DS 142)" for evaluation of the total energies
L1 L2 L3.
– "Data record for energy counter (DS 143)" for evaluation of the phase-specific energy.
– "Data record for phase-specific measured values L1 - L3 (DS 147 - 149) for evaluation
of the phase-specific energies.
The overflow counters are evaluated by:
● Using the input data of the user-defined user data variant with the use of the respective
measuring value IDs for overflow counters
● Reading the "Data record for energy counter (DS 143)".
The evaluation of measured values via the input data of user data variants and reading of
data records with the RDREC instruction is described in the section Reading and processing
measured values (Page 35).
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