Siemens SINAMICS S120 Device Manual page 378

Options
8.11 K50, Sensor Module Cabinet-Mounted SMC30
Note
Because the physical transmission media is more robust, the bipolar connection should
always be used for HTL encoders. The unipolar connection should only be used if the
encoder type does not output push-pull signals.
Table 8- 11 Specification of encoder systems that can be connected
Parameter
High signal level
(TTL bipolar at X520 or X521/X531)
Low signal level
(TTL bipolar at X520 or X521/X531)
High signal level
(HTL unipolar)
Low signal level
(HTL unipolar)
High signal level
(HTL bipolar)
2)
Low signal level
(HTL bipolar)
2)
High signal level
(SSI bipolar at X520 or X521/X531)
Low signal level
(SSI bipolar at X520 or X521/X531)
Signal frequency
Edge clearance
Zero pulse inactive time
(before and after A=B=high)
Zero pulse active time
(while A=B=high and beyond)
Other signal levels according to the RS 422 standard.
1)
The absolute level of the individual signals varies between 0 V and V
2)
t is not a specified value, but is the time between the falling edge of track A and the rising edge of track B after
3)
ALo-BHi
next.
The threshold can be set via p0405.04 (switching threshold); the factory state setting is "Low".
4)
378
Designation
U
Hdiff
1)
U
Ldiff
1)
U
4)
H
U
4)
L
U
Hdiff
U
Ldiff
U
Hdiff
1)
U
Ldiff
1)
f
S
t
min
t
Lo
t
Hi
Threshold Min.
2
-5
High 17
Low 10
High 0
Low 0
3
-V
CC
2
-5
-
100
640
640
of the encoder system.
CC
Max. Unit
5 V
-2 V
V V
CC
V V
CC
7 V
2 V
V V
CC
-3 V
5 V
-2 V
300 kHz
- ns
(t - t )/2 ns
3)
ALo-BHi Hi
t - 2 x t ns
3)
ALo-BHi Lo
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A