Siemens SINAMICS S120 - Page 378

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