7.2.2 Analogue inputs
Only the parameters of the analogue functions are set in this area.
The Analogue Inputs menu branch contains the following submenu branches:
•
Signal type
I / U
•
Characteristic
linear, round tank, spherical tank, table
•
Measuring range
Lower range value, upper range value
•
Scaling
Scaling start, scaling end
•
Filter
XXX s
•
Counter
Counter reading, switching threshold, pulse factor, pulse divider
The following parameters are available for configuring the analogue inputs.
Parametername
Default value
Range
Unit
Signal type
I
I / U
Characteristic
linear
linear, round tank,
spherical tank, table
Measuring range
0...20
lower range value,
upper range value
mA
Filter
0
0 ... 999
Counter,
counter
value
0...999999
Counter,
Switching threshold
1,2 / 2,1
Messbereich
mA
Counter, Pulse factor
0...10000
0
Counter,
Pulse
di-
vider
1...100000
1
The digital levels that control the counters are derived from the set-up counter switch-
ing thresholds. The corresponding values can be read on their own Modbus registers.
See chapter 8.2 on page 33.
For level detection, an analogue value must have safely reached the switching threshold
and assume a stable state for at least two seconds.
When using the voltage inputs as pulse inputs, voltage values up to 25 volts are per-
missible. However, they are only recorded analogue up to 10 volts.
An adjusted filter leads to an extension of this stabilisation phase.
With pulse factor and pulse divider the incoming pulses can be evaluated
(Count value = Input pulse x Pulse factor / Pulse divider).
The count values can only be saved automatically once per hour, in a non-volatile
memory (EEPROM). All values accumulated within one hour are lost in the event of
a supply voltage failure.
Direct editing of the linearisation table on the AD-VL 500 is NOT
provided. The table can be edited and transferred to the unit via
the web interface or the Configuration software AD-Studio .
Finished tables can be exchanged via the import and export func-
tions using a USB stick.
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