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1 Vpp incremental signals
90º
V
A
V
B
20 m
Clock sequence
T
t
1
1
2
3
MSB
To function correctly the configuration of the SSI protocol in the linear encoder must match the configuration of the SSI protocol in the
unit the linear encoder is connected to (see the description of the parameters on page 10 of this manual). These Fagor linear
encoders are manufactured with the following default values.
Number of Bits
Counting Resolution
Data Type
Parity
Time Out
Normally it is possible to match these values by adjusting them in the unit the linear encoder is connected to. However, if this is not
possible, the values can be changed in the linear encoder. This can be done using the Fagor PD-U-ENC adapter to connect.
For further details please consult you Fagor office.
ELECTRICAL CHARACTERISTICS
1V
pp
1V
pp
Absolute signals
t
2
n-1
n
LSB
Configuration of the SSI protocol
Default values for SSI protocol in Fagor linear encoders (scales)
32
0.1 µm
Binary
NO
450 µs
Signals
V
A
V
B
DC offset
Signal period
Phase Shift A & B
V
A
Freq@120m/min
Power supply V
Power supply Imax
Max cable length
Transmission
Levels
Clock frequency
Max bits (n)
T
t
t
SSI
Parity
Page 8/15 - "GA" - V1701
Specification
A, B, /A & /B
1 V +20 %, -40 %
pp
1V +20%, -40%
pp
2.5 V 0.5 V
/
V
0.8 V to 1.25 V
B
250 mA (no load) (sense possible)
75 meters. For lengths over 9 meters, a 1 m or 3 m
cable and an extension cable must be used whose
characteristics are:
(4x2x0.14+4x0.5+(4x0.14)) mm
Specification
SSI synchronous serial data transfer via RS-485
100kHz - 500kHz
32 (configurable)
1 s to 10 s
1
20 s to 35 s
2
Gray or binary (configurable)
Fully configurable
20 m
90 º 10 %
100 kHz
5 V 10 %,
2
EIA RS-485
> 1 s
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