Reading and processing measured values
6.2 Quality information
Analog input module AI Energy Meter 480VAC ST (6ES7134-6PA20-0BD0)
Manual, 12/2015, A5E36061895-AA
37
Reading measured values from user data cyclically (Page 40)
Read measured value from a measured value data record (Page 42)
Quality information
Introduction
The AI Energy Meter 480VAC ST supplies quality information about the measurement in a
status word. This information can be used to evaluate the status:
● Currents (I
L1
, I
L2
, I
L3
) and voltages (U
1
, U
2
, U
3
) lie within the valid measuring range
● Operating quadrants for each of the 3 phases
● Direction of rotation of the 3-phase system
Quality information for 3-phase system
The module saves the quality information that can be evaluated under the measuring value
ID 65503 as a bit string in 2 bytes.
You can access the quality information via:
● User data variant "Basic variables quality values three-phase measurement (ID 240 or
F0
H
)
● User data (measured value ID 66503)
● Measured value data record 150
In addition you can evaluate the quality information for the low byte in all the user data
variants for the module version 32 I / 12 Q.
Quality information for individual phases
You can also evaluate the quality information for individual phases via the measured value
data records 147 to 149 or use the user-defined user data variant. You obtain the phase-
specific quality information for the user-defined user data variant under:
● Measured value ID 65500 for Phase 1 (Channel 0).
● Measured value ID 65501 for Phase 2 (Channel 1).
● Measured value ID 65502 for Phase 3 (Channel 2).
In contrast to the allocation for measured value 65503, the measured value IDs only contain
the phase-specific information for current, voltage and operating quadrant. The information
about the other phases and the rotating field have the value 0.
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