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Configuration of the digital inputs as pulse
counters
All digital inputs can be operated with a frequen-
cy of 20 Hz. The pulse duration (pulse width) and
the pulse pause must be greater than 20 ms. The
typical pulse duration for S0 pulses is 30 ms.
Pulse duration
(pulse width)
> 20 ms
Pulse pause
> 20 ms
The maximum number of pulses per hour is cal-
culated based on the minimum pulse duration and
the minimum pulse pause:
Pulse dura-
tion (pulse
width)
Pulse pause
(pulse pause)
Max. pulses/h
20 ms 20 ms 90000 pul./h
30 ms 30 ms 60000 pul./h
50 ms 50 ms 36000 pul./h
100 ms 100 ms 18000 pul./h
500 ms 500 ms 3600 pul./h
1 s 1 s 1800 pul./h
10 s 10 s 180 pul./h
Abb. Examples of the maximum pulses per hour.
You configure the pulse counters with simulta-
neous measured-value or power calculation. The
pulses are counted as a 64-bit number and the
device has sufficient memory capacity for data
acquisition.
Pulse valency
The pulse valency indicates what measured value
or power value (e.g. energy) corresponds to a
pulse. A pulse valency can be assigned to each
digital input.
INFORMATION
The pulse interval is proportional to the power with-
in the selected settings.
Since the pulse interval can be very large, contin-
uous calculation of the measured or power values
is not possible. Consequently, only average values
are calculated. The calculation of the average
values for the measured value calculation results
from the number of pulses per period multiplied by
the pulse valency. For the calculation of the mean
power values, this value must be divided by a con-
figurable time value.
The period is assigned to the respective digital
input and can be set to between 1 and 60 minutes.
After expiration of the period, the value can be
accessed via the Modbus.
An external synchronization can be connected for
each digital input, whereby one synchronization
pulse completes a period and starts a new period.
A catch time of 30 seconds is set for the external
synchronization. If there is no synchronization
pulse after the period has expired, the software
takes over the synchronization after 30 seconds;
also of the future periods.
Measured value = pulse x pulse valency
Power value =
Pulse x pulse valency
Time [s]
Power value calculation:
Measured value calculation:
Default setting for one period = 15 minutes
The calculation result of the S0 power value is
available at the end of the period.
INFORMATION
The programming in the GridVis
®
software shows a
selection of energy values derived from the power
values.
Abb. Pulse duration/pulse pause.