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PAM-199-P
5.15
AIN (Analogue input scaling)
Command
Parameters
Unit
Group
FUNCTION
AIN:I
a b c x
i = A|B
a= -10000… 10000
b= -10000… 10000
c= -10000… 10000
x
= V|C
-
-
-
0.01%
-
EXP
195
196
This command offers an individual scalable input. The following linear equation is used for the scaling.
Output = A/B ∙ (Input – C)
The
“C” value
is the offset (e.g. to compensate the 4 mA in case of a 4… 20 mA input signal).
The variables
A
and
B
are defining the gain factor with which the signal range is scaled up to 100 % (e.g. 1.25
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
X
value.
The gain factor is calculated by setting the usable range (
A
) in relation to the real used range (
B
) of the input
signal.
Usable are 0… 20mA, means (
A
) has the value
20
. Really used are 4… 20mA, means (
B
) has a value
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 (
X
) has to be set to
C
choosing current signal.
In this case AIN command would look like this:
AIN:I 20 16 2000 C or AIN:I 1250 1000 2000 C (see last example of FUNCTION = 196 below)
Typical settings (examples):
FUNCTION = 195
Input signal
Description
AIN:I
20
20
0 V
OR
AIN:I
1000 1000
0 V
-10… 10 V
Voltages input: Usable -
10… 10V (20V) for a working
range of -
100… 100% (
two solenoids
).
AIN:I
20
10
0 V
OR
AIN:I
2000 1000
0 V
-5… 5 V
Voltages input: Usable -
10… 10V (20V) for a working
range of -
100… 100% (
two solenoids
).
Really used are -
5… 5V (10V).
AIN:I
20
10
5000 V
OR
AIN:I
2000 1000
5000 V
0… 10 V
Voltages input: Usable -
10… 10V (20V) for a working
range of -
100… 100% (
two solenoids
).
Really used are
only
0… 10V for
both solenoids
with
5V zero point
setting (e.g. for joystick use).
AIN:I
40
16
6000 C
OR
AIN:I
2500 1000
6000 C
4… 20 mA
Current input:
theoretically
usable range -2
0… 20mA
(40mA) for a working range of -
100… 100% (
two so-
lenoids
).
Really usable are
only
4… 20mA (16mA) for both so-
lenoids with 12mA zero point setting.
FUNCTION = 196
Input signal
Description
AIN:I
10
5
0 V
OR
AIN:I
2000 1000
0 V
0… 5 V
Voltages input: Usable
0… 10V for a working range of
0… 100% (
one solenoid
).
Really used are 0… 5V for 0… 100%.
AIN:I
10
8
1000 V
OR
AIN:I
1250 1000
1000 V
1… 9 V
Voltages input: Usable
0… 10V for a working range of
0… 100% (
one solenoid
).
Really used are 1… 9V (8V) for 100% with 10% offset.
AIN:I
20
16
2000 C
OR
AIN:I
1250 1000
2000 C
4… 20 mA
Current input:
theoretically
usable range
0… 20mA for
a working range of 0… 100% (
one solenoids
).
Really usable are 4… 20mA (16mA).
