Actual signals and parameters 187
13 ANALOG INPUTS Analog input signal processing
1301 MINIMUM AI1 Defines the minimum %-value that corresponds to minimum
mA/(V) signal for analog input AI1. When used as a
reference, the value corresponds to the reference minimum
setting.
0…20 mA 0…100%
4…20 mA 20…100%
-10…10 mA -50…50%
Example: If AI1 is selected as the source for external
reference REF1, this value corresponds to the value of
parameter 1104 REF1 MIN.
Note: MINIMUM AI1 value must not exceed MAXIMUM AI1
value.
1.0%
-100.0…100.0% Value in percent of the full signal range.
Example: If the minimum value for analog input is 4 mA, the
percent value for 0…20 mA range is:
(4 mA / 20 mA) · 100% = 20%
1 = 0.1%
1302 MAXIMUM AI1 Defines the maximum %-value that corresponds to
maximum mA/(V) signal for analog input AI1. When used as
a reference, the value corresponds to the reference
maximum setting.
0…20 mA 0…100%
4…20 mA 20…100%
-10…10 mA -50…50%
Example: If AI1 is selected as the source for external
reference REF1, this value corresponds to the value of
parameter 1105 REF1 MAX.
100.0%
-100.0…100.0% Value in percent of the full signal range.
Example: If the maximum value for analog input is 10 mA,
the percent value for 0…20 mA range is:
(10 mA / 20 mA) · 100% = 50%
1 = 0.1%
1303 FILTER AI1 Defines the filter time constant for analog input AI1, that is,
the time within which 63% of a step change is reached.
0.1 s
0.0…10.0 s Filter time constant 1 = 0.1 s
1304 MINIMUM AI2 Defines the minimum %-value that corresponds to minimum
mA/(V) signal for analog input AI2. See parameter 1301
MINIMUM AI1.
1.0%
-100.0…100.0% See parameter 1301 MINIMUM AI1. 1 = 0.1%
1305 MAXIMUM AI2 Defines the maximum %-value that corresponds to
maximum mA/(V) signal for analog input AI2. See
parameter 1302 MAXIMUM AI1.
100.0%
All parameters
No. Name/Value Description Def/FbEq
Unfiltered signal
Filtered signal
Time constant
63
100
%
t
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