Measurement control HMI → FW and PLC → FW
● With a 1 signal of the control bit "MeasAuto" (DBX1.0), the user requests that the firmware
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 firmware only evaluates this signal if control bit "MeasAuto" (DBX1.0) is set.
Measurement carried out by the firmware
For these measurements, the cyclic increases in the energy values are accumulated in the
measured variables.
The behavior for different signal sequences of both measurement control signals are described
in the following:
● DBX1.0 is set first
If DBX1.0 ("MeasAuto") is first set, and then remains statically present, every 0-1 edge of
DBX2.0 ("MeasAct") deletes the measured value and then starts the measurement.
If DBX2.0 is reset, the measurement is canceled and the measured value remains constant.
The sequence is repeated at the next 0-1 edge of DBX2.0.
0HDVXUHG
YDOXH
'%;
'%;
Figure 3-7 Measurement control signal DBX1.0 is set first
● DBX2.0 is set first
If DBX2.0 ("MeasAct") is set first, and then remains statically present, every 0-1 edge of
DBX1.0 ("MeasAuto") accumulates the measured value without deleting the previous value.
If DBX1.0 is reset, the measurement is only interrupted and the measured value remains
constant.
0HDVXUHG
YDOXH
'%;
'%;
Figure 3-8 Measurement control signal DBX2.0 is set first
Ctrl-E Analysis
3.3 Commissioning the PLC for Ctrl-E Analysis
Ctrl-Energy
36 System Manual, 01/2015, 6FC5397-0EP40-5BA2
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