
Analog-digital conversion
79
06/99 AWB 2700-1364 GB
Inputs for 4 to 20 mA
Figure 26: Value range for current inputs 4 to 20 mA
If the input current exceeds 20 mA, the maximum
value “1023” of the value range is generally stated.
If the input current drops below 4 mA or becomes
negative through polarity reversal of the conductors,
the value 205 (CC hex) is always displayed as the
measured value. In this case, a diagnostic bit (wire
break) is set (see also Page 70).
The value range 0 to 1023 can be scaled with the
help of the “DataScale” function block.
mA
19.99
4
CC
3FF
hex
1023
205
dez
0
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