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6.6
Analog inputs
A continuous signal current flow is applied to the signal current inputs (e.g. 0..20mA
or 4..20mA). This current is proportional to the actual demand. For firmware version
from 1.06.00 and up: the average value (50 scans per second) will be send every
second to the DLX-CPU: digital telegram.
Figure 25, Analog inputs
Select the settings for every analog input:
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•
•
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Minimum and maximum value;
Set the offset 0mA or 4mA (correspond to the minimum value)
20mA correspond to the maximum value;
Calculation method: average value (over a measuring period) or instantaneous
value (last data telegram at the end of measuring period);
Offset:= minimum value (only positive values will be saved and transmitted to the
AMR software)
Note:
Summation of the digital values is not possible!
Examples:
Signal current input: 4..20mA with 0..10m³/h (e.g. flow)
Reading constant K = 0,1; offset = 0m³/h
→ Minimum value:= 0
Maximum value:= 100 (100 × 0,1m³/h = 10m³/h)
data storage:= 0
data storage:= 100
Signal current input: 4..20mA with 20..50m (e.g. water level)
Reading constant K = 1; offset = 20m
→ Minimum value:= 20 (20 × 1m = 20m)
Maximum value:= 50 (50 × 1m = 50m)
data storage:= 0
data storage:= 30
Signal current input: 0..20mA with -20°C..70°C (e.g. temperature)
Reading constant K = 0,1; offset = -20°C
→ Minimum value:= -200 (-200 × 0,1°C = -20°C)
Maximum value:= 700 (700 × 0,1°C = 70°C)
Note:
42
data storage:= 0
data storage:= 900
Minimum value:= 0 and Maximum value:= 50 → analog input deactivated;