turck BL20 Series - 12.5.3 Technical data

Technology Modules
Hans Turck GmbH & Co. KG | T +49 208 4952-0 | F +49 208 4952-264 | more@turck.com | www.turck.com
420
rate, telegram length etc. are set via the parameter interface. The diagnostics interface supplies the
higher level system with error messages, such as parameter errors.
12.5.3 Technical data
The module is provided with two RS422 interfaces that form one SSI interface. One RS422 interface
works as the clock generator for reading the data, which is then received on the other RS422 inter-
face.
Fig. 290: Block diagram BL20-1SSI
Technical data
Designation BL20-1SSI
Number of SSI-interfaces 1
Encoder voltage 24 VDC (-15 %/+20 %)
Encoder current Max. 500 mA (non short-circuit proof)
Clock output type RS422
Signal input type RS422
RS422 cable length Max. 30 m
Nominal voltage from supply terminal U
L
24 VDC
Nominal current from supply terminal (field) I
L
25 mA (without encoder current)
Nominal current consumption from 5 VDC (module
bus) I
MB
< 50 mA
Power loss of the module < 1 W
Isolation voltage
U
TMB
(module bus/ field) 500 V
eff
U
FE
(field/ functional earth) 500 V
eff
U
field
(field voltage/IO-connectors) 0 V
module
bus
interface
module bus
micro
controller
RS485/422
interface
CL+
CL-
D+
D-
GND
U
L
field supply
DC
DC