● If the control bits DB1001.DBX0.2 and DBX0.3 are equal to 0, then the HMI counts the
energy on the basis of the total active power transferred from the SENTRON between the
start and stop.
● If the imported and exported energy is to be directly evaluated by SENTRON PAC
(DB1001.DBX0.2 and DBX0.3 equal to 1), then program this measurement in the user
program as follows:
– SENTRON PAC devices permanently cumulate the "imported active energy (tariff 1)"
or "the exported active energy (tariff 1)" separately when their supply voltages are
connected.
– With the positive edge of the signal "Measurement running" (DB1001.DBX2.0) you
buffer these instantaneous values from SENTRON (imported and exported active
energy T1)
– Cyclically generate the differences between the energy data now being counted minus
the initial values, divide the differences by 1000.0 and transfer the results to
DB1001.DBD12 (for measured imported active energy T1) and DB1001.DBD16
(measured exported active energy T1) up to the STOP signal (falling edge).
– During the measurement, the increasing difference (energy in kWh) is displayed on the
HMI, which can then be read as measured value with Stop measurement.
Measurement control HMI → GP and PLC → GP
● With a 1 signal of the control bit "MeasAuto" (DBX1.0), the user requests that the basic
program makes the measurement.
If this bit is not set, then the user is responsible for calculating and writing the measured
values.
● Using a 1 signal of the control bit "MeasAct" (DBX2.0), via the HMI it is signaled as to when
the measurement should be made: 0→1 start measurement, 1→0 stop measurement.
The basic program only evaluates this signal if control bit "MeasAuto" (DBX1.0) is set.
Measurement carried out by the basic program:
For these measurements, the cyclic increases in the energy values are accumulated in the
measured variables.
Ctrl-E Analysis
3.3 Commissioning the PLC for Ctrl-E Analysis
Ctrl-Energy
28 System Manual, 01/2015, 6FC5397-0EP40-5BA2
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