User manual

6 Detailed descriptions of I/O modules | Digital interface module UR20-1SSI
381Manual u-remote1432790000/08/12.2015
Digital Input module UR20-1SSI (Order No. 1508090000)
The UR20-1SSI digital interface module can read differential
signals (RS422) from a SSI encoder. It can be connected as
a master directly to the encoder providing the clock. To syn-
chronise two SSI encoders a second SSI module running in
mode "Listening" can be placed between the encoder and a
master module from wich it receives the clock.
The data transfer rate might be between 125kHz and
2MHz, the data format can be chosen between binary or
Gray-Code.
Connected sensors can be delivered either with 5VDC or
24VDC. Both supply outputs are protected against overcur-
rent, they must not be used simultaneously.
The communication status is indicated by three LEDs. The
module electronics supply the connected sensor with power
from the input current path (I
IN
).
1
2
3
4
2
1
3
4
1
2
3
4
2
4
3
1
2
4
3
1
1
2
3
4
2
1
3
4
1
2
3
4
2
4
3
1
2
4
3
1
1
2
3
4
2
1
3
4
1
2
3
4
2
4
3
1
2
4
3
1
Data In+
Data In–
CLK In+
CLK In–
CLK Out+
CLK Out–
+5 V
GND
+24 V
FE
1SSI
SSI Encoder
SSI Encoder 1 SSI Encoder 2
1SSI
Data In+
Data In–
Master Master Listening
CLK In+
CLK In–
CLK Out+
CLK Out–
+5 V
GND
+24 V
FE
1SSI
Connection diagram UR20-1SSI as a master or in mode „Listening“
The SSI encoder must be connected using a
shielded wire (maximum length 320m with
125kHz)! The shielding has to be designed as
described in the chapter „Earthing and shiel-
ding“
6.49 Digital interface module UR20-1SSI