4 B1406
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SSI Clock (+)
SSI Clock (-)
SSI Data (+)
SSI Data (-)
+7 to 30 V
0V
Input
Power
Supply
SSI Shift Register and Controller
Output Data Format Conversion
Position Measurement
SSI Clock (+)
SSI Clock (-)
12V
12V
SSI Data (+)
SSI Data (-)
12V
12V
Power Supply (+)
Common
33V
Input
Power
Supply
Ferrite
Filter
+5V
RS-422
RS-422
Clock (+)
Data (+)
Clock Interval
LSB
MSB
Min. 16 µs
SSI Logic Diagram
SSI Sensor Input
SSI Timing Diagram
SSI (Synchronous Serial Interface)
The displacement value (position) is encoded into a 24, 25 or
26 Bit format and transmitted at high speeds. Synchroniza-
tion in a closed loop system is made easy. A clock pulse train
from a controller is used to shift out sensor data: one bit of
position data is transmitted to the controller for one clock
pulse received by the sensor. The absolute position data is
continually updated by the sensor and converted by the shift
register into serial information.
CLOCK
DATA
SAMPLING AT
FALLING EDGE
SAMPLING AT
RISING EDGE
SAMPLING
BETWEEN EDGES
Note: Based on Turck cordset number RKC 6T-30/S618
New data is placed on the"data" signal 605nS after the rising edge of the"clock" signal. This time, plus
the delay caused by cable length, must be considered when determining the setup times (frequency)
of the controller.
