Communication Via The Serial Interface - Sensopart FT 50 RLA 70-L8 Mounting And Operating Instructions

Mounting and
operating instructions
Double layer measurement
Reliable detection of double layers in sheet metal processing industry. The problems caused by an uneven feeding
of sheets and a strongly fluctuating distance to the sensor can be solved with the aid of parallel differential mea-
surement (illustr. 23 / illustr. 24) or differential thickness measurement (illustr. 22 / illustr. 25). The analogue value on
the master results from the difference between the measured values of the two sensors. The analogue output of the
slave indicates the distance from the sensor (slave) to the object. Double layers are detected when threshold values
(teach-in of switch points  settings 2 and 3) for the thickness of the object have been previously set on the master.
Sheet metal
8

Communication via the serial interface

All FT 50 RLA ...S1 sensors are equipped with a bus-compatible, serial interface (RS485) for the transmission
of distance values and the setting of sensor functions. The primary control system controls data exchange. Data
transfer occurs through an exchange of short telegrams.
INFORMATION
For a convenient parameterisation of the S1 sensor types there is an operating software „Pro-
gSensor" available for download on our website (www.sensopart.de). In simulation mode, it
indicates the relevant correct bus commands.
If several sensors are connected via the RS485 bus, reflections can occur which may impair
transmission. At the end of the RS485 bus, the cable must therefore be fitted with a resistor
corresponding to the characteristic resistance of the used cable (normally 120 Ohm).
If a sensor is set as master or slave, communication with the PC is not possible.
FT 50 RLA Disctance sensor - GB - 068-13671 - 20.04.2009-05
Sheet metal
Illustr. 24
15500860
Control
Illustr. 25
15500267
61