turck LTX M Series, Руководство по эксплуатации

Страница: 10 / 24

10
Hans Turck GmbH & Co. KG | T +49 208 4952-0 | F +49 208 4952-264 | more@turck.com | www.turck.com
Product Description
4.2 Properties and features
■
SSI output
■
Automatic signal control
■
7…30 VDC supply voltage
■
Low power consumption
■
High shock and vibration resistance
■
Protection class IP68
■
16-bit resolution
■
Status display via 3-color LED
■
Sensor and pressure pipe can be replaced separately
■
M12 connector
4.3 Operating principle
Turck LTX sensors utilize the magnetostrictive principle. A "waveguide" is located in the measur-
ing probe of the linear position sensor. If a current signal generated at the waveguide encoun-
ters the externally applied magnetic field of the positioning element, mechanical feedback is
produced in the waveguide. This feedback is evaluated in the sensor head and output as posi-
tion information.
4.4 Functions and operating modes
The devices have an SSI interface according to the RS422 standard. The process value is trans-
ferred via the interface either directly to the higher-level controller (with SSI card) or to a field-
bus device.
Fig. 2: Block diagram of the sensor control
The location of the positioning element on the sensor measuring probe is determined by
means of a propagation time measurement and transmitted to the controller via the SSI inter-
face. All position values are determined as absolute values; reference runs after a voltage drop
are unnecessary.
+7…30 V
0 V
SSI Clock (+)
SSI Clock (–)
SSI Data (+)
SSI Data (–)
Input
Power
Supply
SSI Shif
t Register and
Co
ntroller
Output Data
Fo
rmat
Co
nv
ersion
SSI Logic Diagram
Position Measuremen
t