STOBER
6 | Technical data
02/2019 | ID 442728.05
61
SSI encoders
Specification
SSI signals
U
2
12 V
DC
(unregulated)
I
2max
250 mA
Encoder design
Single-turn and multi-turn
Clock frequency
250 kHz and 600 kHz
Sampling rate
250 µs
Monoflop time
≤ 30 µs
Code
Binary or gray
Format
13, 24 or 25 bits
Transfer
Double or single
Max. cable length
100 m, shielded
Tab. 54: SSI specification
Incremental encoders
Specification
Incremental signals
U
2
12 V
DC
(unregulated)
I
2max
250 mA
f
max
1 MHz
Signal level
TTL, differential
Max. cable length
100 m, shielded
Tab. 55: Specification for TTL differential incremental signals
Information
Calculation example – Limit frequency f
max
for an encoder with 2,048 pulses per revolution: 3,000 revolutions per minute (equivalent to 50
revolutions per second) * 2,048 pulses per revolution = 102,400 pulses per second = 102.4 kHz
<< 1 MHz
Information
Using a HT6 adapter for level conversion from HTL signals to TTL signals, it is also possible to
connect a differential HTL incremental encoder to terminal X4. Note that, with an external power
supply, the maximum level of 20 V
DC
for the the HTL signals may not be exceeded.
