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54
Pulse counter
All digital inputs can be operated with a
frequency of 25 Hz. Here, the pulse duration
and the pulse interval must be greater than
20 ms.
The typical pulse duration for S0 pulses is 30
ms.
Pulse duration
> 20ms
Pulse pause
> 20ms
The maximum number of pulses per hour is
based on the minimum pulse duration and
the minimum pulse interval:
Pulse
length
Pulse inter-
val
Max. pulses/h
20 ms 20 ms 90 000 pulses/h
30 ms 30 ms 60 000 pulses/h
50 ms 50 ms 36 000 pulses/h
100 ms 100 ms 18 000 pulses/h
500 ms 500 ms 3 600 pulses/h
1 s 1 s 1 800 pulses/h
10 s 10 s 180 pulses/h
Examples of the maximum number of pulses per hour.
The pulse counters can be configured with a
simultaneous measurement value or power
calculation. The pulses are counted as 64-bit
numbers and overflow after approx. 1.17 x
10
10 years of continuous operation (25 Hz).
Pulse value:
A pulse value can be assigned to each digital
input. Use the impulse value to specify the
measurement value or power value (e.g. ener-
gy) to which a pulse should correspond.
C
ATTENTION!
The pulse interval is proportional to
power within the selected settings.
Calculation of measurement value:
Measurement value = Pulse x Pulse value
Calculation of power value:
Power value =
Pulse x Pulse value
Time [sec]
Since the pulse interval may be very large,
continual calculation of the measurement
or power values is not possible. For this
reason, only the mean values are calculat-
ed. For measurement value calculation, the
mean values are calculated from the number
of pulses per period multiplied by the pulse
value. For power value calculation, this value
must be divided by the amount of time that
can be set.
The period is assigned to the digital input and
can be set in a range of 1 to 60 minutes. After
the period ends, the value can be called via
the Modbus.
For each digital input, an external synchroni-
zation can be triggered; in this case, a syn-
chronisation pulse completes one period and
starts a new period. A fixed capture period of
30 seconds is preset for external synchroni-
zation. If no synchronization pulse exists after
the period expires, a maximum of 30 seconds
is waited and the software then carries out
the synchronization. All further periods are
synchronized by the software.
A period of 15 min is the factory setting.
The calculation result for the S0 power
value is not available until the end of the
cycle.