Reading and processing measured values
6.3 Reading measured values from user data cyclically
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
50 Manual, 07/2018, A5E42674880-AA
Reading measured values from user data cyclically
Requirement
● STEP 7 is open.
● The AI Energy Meter HF Is configured.
Scaling of measured values in the user data
Since the value range of 16-bit values is often smaller than the value range of the physical
value, a scaling factor is supplied together with the basic value in the user data for the
respective measured or calculated values. You determine the actual value of the measured
variable with the following formula:
Actual value of measured quantity = measured value in the user data x 10
scaling factor
To read measured values from the user data cyclically, proceed as follows:
1. Read the relevant measured value from the input data.
2. Observe the scaling factor at scaled measured values and convert the read measured
value using the scaling factor.
The user data variant 254 (FE
H
) "Total power L1L2L3" is configured on the AI Energy Meter
HF. The measured value for "Current L1" should be read.
Table 6- 1 Total power L1L2L3
1 Quality information = QQ
1
I
3
U
3
I
2
U
2
I
1
U
1
BYTE Bit
qq xx xx xx -
4 ... 5 Current L2 UINT 1 mA 0 … 65535 66008
Total active power L1L2L3
Total reactive power Qtot L1L2L3
Total apparent power L1L2L3
14 ... 17 Total active energy L1L2L3 DINT 1 Wh -2147483647 to
225
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