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5.3
Input signal adaption
5.3.1 AIN (Analogue input scaling)
Command
a b c x
AIN:I
This command offers an individual scalable input. The following linear equation is used for the scaling.
"C" value
is the offset (e.g. to compensate the 4 mA in case of a 4... 20 mA input signal).
The
A
B
The variables
and
if using 4... 20mA input signal, defined in default current settings by A = 1250 and B = 1000). The internal
shunt for the current measuring is activated with switching the
The gain factor is calculated by setting the usable range (
signal. Usable are 0... 20mA, means (
of 16 (20-4). Not used are 0... 4mA. In a range of 20mA this is an offset of 20%, means a value of 2000 for
C
(
). Last but not least (
Means AIN command would look like this: AIN:I 20 16 2000 C or AIN:I 1250 1000 2000 C (20/16 = 1.25)
Changing the polarity/direction of the signal is realized by negating one of the gain factors.
Specific characteristic here:
-> For the sensor a unipolar signal is used to map a bipolar value range. At the scaling function this is simu-
lated by virtual doubling up the available signal range. Additionally the offset is set to the middle of the used
signal range.
Typical settings (examples):
AIN settings
AIN:W
1000
1000
AIN:W
-1000
1000
AIN:X
1000
1000
->
X
2000
1000
AIN:W
20
AIN:X
1250
1000
-> W,X
2500
1000
If the settings are unknown it is recommended to use the standard settings for the sensor (0...10V or 4...
20mA). The displayed feedback value X represents the zero position (C). Now generate a full control with
100% feed forward in OL mode and then the X value represents the used signal range (B). For being sure re-
peat the last process in negative way (SIGNAL:U = 2S-). If higher this value should be taken for B. At last dou-
ble up the A value. For this adjustment procedure the remote control mode of the module can be used which
can be handled easily by the WPC-300 program.
Page 21 of 33
Parameters
i = A|B
a= -10000... 10000
b= -10000... 10000
c= -10000... 10000
x
= V|C
Output = A/B ∙ (Input – C)
are defining the gain factor with which the signal range is scaled up to 100 % (e.g. 1.25
) has the value 20. Really used are 4... 20mA, means (
A
X
) has to be set to C for choosing current signal.
0 V
0 V
0 V
5000 V
16
2000 C OR
2000 C
6000
Unit
-
-
-
0.01%
-
X
value.
A
) in relation to the real used range (
Input signal
-10... 10V
Gain 1 – range: -100%... 100%
10... -10V
Gain 1 – range: 100%... -100%
0... 10 V
Gain 1 – range: 0... 100%
0... 5... 10V
-> Range -100%... 0... 100%
4... 20 mA
Gain 1 – range: 0... 100%
4... 12... 20 mA
-> Range -100%... 0... 100%
PAM-198-P
Group
IO_CONF
B
) of the input
B
) has a value
Description
05.06.2020
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