Siemens Simatic ET 200SP Manual page 116

Example
The following figure is a schematic diagram of the principle of operation:
①
②
③
④
⑤
Figure 14-3
The following table shows the parameter assignment for the example:
Table 14- 7
Parameter
Power quality analysis functions
Diagnostics overflow
Diagnostics underflow
Nominal value voltage
Voltage transformer primary voltage
Voltage transformer secondary voltage
Tolerance factor overflow/underflow
In this example you define a tolerance range of ± 20%. The tolerance range corresponds to
an effective value of primary voltage of ± 46 V.
In the figure the effective value of the primary voltage first exceeds the tolerance range. As
long as the effective value of the primary voltage exceeds the tolerance range the module
reports the diagnostics "overflow".
The effective value of the primary voltage then exceeds the tolerance range. As long as the
effective value of the primary voltage exceeds the tolerance range the module reports the
diagnostics "underflow".
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA
Upper tolerance value measuring voltage
Nominal voltage
Lower tolerance value measuring voltage
Diagnostics "overflow"
Diagnostics "underflow"
"Overflow/Underflow" diagnostics of the effective voltage value
Parameter assignment
Enable
Enable
Enable
230 V
1000 V
500 V
20%
Interrupts/diagnostic alarms
14.4 Diagnostics response
115