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Page 38 of 62 POS-124-U-PFN-2030 23.08.2016
5.7 Terminal mode commands
Please contact W.E.St. in case of using these commands.
AINMODE (Input scaling mode)
Command Parameter Unit Group
AINMODE x x= EASY|MATH -
TERMINAL
This command is used to switch over the kind of input scaling.
The AINMODE is used to define the kind of parameterizing of the analogue inputs. The EASY mode
(DEFAULT) supports a simple and application oriented input scaling.
The MATH mode supports the free input scaling by a linear equation. This mode is compatible to our older
modules.
Attention: This command can be executed in the terminal window only. In case of switching back,
DEFAULT data should be reloaded.
AIN (Analogue input scaling)
Command Parameters Unit Group
AIN_1:X
AIN_2:X
a= -10000… 10000
b= -10000… 10000
c= -10000… 10000
x= V|C -
-
0,01 %
-
MATH INPUT
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 inter-
nal 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.