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5.3 Input signal adaptation
5.3.1 AIN (Analogue input scaling)
Command
AIN:W
A
B
C
X
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
The variables
A
and
B
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 (
In this case AIN command would look like this:
AIN:I 20 16 2000 C or AIN:I 1250 1000 2000 C (see below)
Typical settings:
Command
AIN:X
1000 1000
AIN:X
10
8
1000 V OR
AIN:X
1250 1000
1000 V
AIN:X
10
4
AIN:X
2500 1000
AIN:X
20
16
2000 C OR
AIN:X
2000 1600
2000 C OR
AIN:X
1250 1000
2000 C
Page 17 of 24
Parameters
a= -10000... 10000
b= -10000... 10000
c= -10000... 10000
x= V|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 choosing current signal.
Input
0 V
0... 10 V
1... 9 V
500 V OR
0,5... 4,5 V
500 V OR
4... 20mA
Unit
-
-
0,01 %
-
X
value.
A
) in relation to the real used range (
Description
Range: 0... 100 %
Range: 0... 100 %; 1 V = 1000 used for the offset and
gained by 10 / 8 (10 V divided by 8 V (9 V -1 V))
Range: 0... 100 %; 0,5 V = 500 used for the offset and
gained by 10 / 4 (10 V divided by 4 V (4,5 V -0,5 V))
Range: 0... 100 %
The offset will be compensated on 20 % (4 mA) and the
signal (16 mA = 20 mA – 4 mA) will be gained to 100 %
(20 mA).
Each of this parameterization for 4... 20 mA is setting the
range to 0... 100 %.
PAM-190-P-A/I
Group
STD
B
) of the input
B
) has a value
05.06.2020
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