Difference Hold Mode; Measured Value Hold Mode - Festo SOEL-RTD-Q50-PP-S-7L Instructions De Service Et De Montage

SOEL-

Difference hold mode

When the difference hold function is activated and Q
maximum value of the measuring signal and stores it.
If Q = -U , the last differential value is transmitted at the analogue output.
1 B
Example of use: Checking the contents of open containers or packages.
100% (20 mA)
0% (4 mA)
100% (20 mA)
0% (4 mA)
+U
B
Q
1
-U
B
B
Illustr. 16
15500149

Measured value hold mode

When this function is activated, the last valid measured value is saved.
When no object is in the measuring range, the last valid measured value is transmitted at the analogue output. The current
value is only displayed again when an object is within the measuring range (OK LED = on).
Example of use: Maintain position of tool during change-over of work piece when machining.
Behaviour of analogue output with and without measured value hold.
Start of measuring range
End of measuring range
100% (20 mA)
0% (4 mA)
100% (20 mA)
0% (4 mA)
ON
Good Target Q
2
OFF
Illustr. 17
15500275
Festo SOEL-...0608b English
= +U
1
2
1
1
B A B
A
, this function detects the difference between the minimum and
B
12 mA
1
2 2 mA
Q = +U = Sample. Collect measured values
A
2
1 B
B Q = -U = Display. Last maximum of analogue signal at
1 B
analogue output
With measured value hold
Without measured value hold
33