Differential Measurement Mode - Pepperl+Fuchs 3RG7256-3NQ00-PF Instructions De Service Et De Montage

Differential measurement mode

Simultaneous connection to SPC control or a PC via the RS 485 interface is not possible with
differential measurement.
With this measuring procedure, two devices are connected to one another. The measuring ranges can overlap (1), be
directly adjacent (2) or apart (3) (Illustr. 18).
To achieve optimum use of the measuring range, the measuring object should if possible be aligned in the centre of
the measuring range.
1
2
3
Illustr. 18
15500152
The following steps must be carried out for differential measurement:
1. Mount both sensors.
2. Connect sensors according to the electrical connection diagram
Master
5
6
Illustr. 19
15400126
4
3. One of the sensors must be configured as a slave. Activate function 26 (see "Settings", page 32)
38
2
+U
RS485 Y/A
1
B
RS485 Z/B
8
Q2
3
Q1
7
-U
B
Measuring range
Measuring range
Measuring range
Slave
2
+U
B
1
5
6
8
4
Q2
3
Q1
7
-U
B
3RG7256­3NQ00­PF Distance sensor ­ 068­13787 / 45­3489 ­ Stand: 03/2011
Mounting and
operating instructions