3 Description
Bauer
SSI data output
12
GEL 235/235x/203x
With the SSI variant, the position value is output serially in binary or grey code. Fur-
thermore, this encoder delivers 64 sin/cos differential signals per revolution for an ex-
ternal interpolation.
With the analog variant, the absolute position is output either as 0–10 V voltage or 4–
20 mA current values.
With the fieldbus variants (CANopen, PROFIBUS-DP), the data format and additional
functions are discussed in a separate document (Reference manual).
A separate electronic circuit is required for the supply of the encoder, the evaluation of
the measured value, and to build up the control loop.
3.4
SSI data output
The maximum clock frequency of 2 MHz applies only for very short transmission cables.
For longer cables, there arise the following limitations:
Cable length up to
Max. clock
frequency
Cable length up to
Max. clock
frequency
50 m
400 kHz
200 m
200 kHz
100 m
300 kHz
400 m
100 kHz
The data and clock lines must be twisted and screened in pairs.
There must be a clock pulse space of at least 16 µs maintained between two position
queries.
Clock
Data
T
T
P
MSB
LSB
T
Period duration of the clock signal (= 1/clock rate)
T
p
Clock pulse space
3.5 Adjustment
possibilities
●
Preset function: Adaptation of encoder measurement value can to the system-spe-
cific requirements (
●
Sense of rotation: Electrically inversion (
●
Teach-in function: Limitation of the encoder’s measurement range for achieving a
higher resolution (
)
