Festo SOEL-RTD-Q50-PP-S-7L, Mounting And Operating Instructions, Page: 32 / 54

Festo SOEL-...1606d English 32
SOEL-
Autom. centre at 120 mm
100% (20 mA)
50% (12 mA)
0% (4 mA)
80 120 300
mm
190
Analogue signal
100% (20 mA)
50% (12 mA)
+U
B
-U
B
Q
1
t(s)
0% (4 mA)
Automatic centre mode
The output characteristic curve 4 – 20 mA is displaced with this function. When the automatic centre function is activated
and Q
1
= +U
B
, the current measured value is equated with the output value of 50% = 12 mA. The incline of the characteristic
curve is maintained and the minimum and maximum values of the characteristic curve are limited by the measuring range.
The distance to the object must be within the measuring range.
Maximum hold mode
When maximum hold mode is activated and Q
1
= +U
B
, this function detects the maximum value of the measuring signal and
stores it.
If Q
1
= -U
B
, the last maximum value is transmitted at the analogue output.
Example of use: determining the maximum value of a shaft
The minimum value can be determined by inverting the analogue output characteristic (see function no. 16 and 17).
Analogue v
alue
Analogue output
Q
1
= +U
B
= Sample. Collect measured values
Q
1
= -U
B
= Display. Last maximum of analogue signal at
analogue output
A A B B
A
B
100% (20 mA)
+U
B
-U
B
Q
1
0% (4 mA)
100% (20 mA)
0% (4 mA)
14 mA
8 mA
1
1
2
2
1
2
Illustr. 13
15500146 Illustr. 14
15500145
Illustr. 15
15500153