Siemens SINAMICS S120 Combi - Page 80

S120 Combi Power Modules
4.3 Interface description
SINAMICS S120 Combi
80 Manual, 11/2017, 6SL3097-4AV00-0BP7
Table 4- 15 Specification of TTL encoder systems that can be connected
Parameter
Designation
Threshold
Min.
Max.
Unit
Signal level, high
1)
U
Hdiff
2
5
V
Signal level, low
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
2)
ns
"Zero pulse active time"
(while A=B=high and beyond)
3)
t
Hi
640 t
ALo-BHi
- 2*t
Lo
2)
ns
1)
Other signal levels according to the RS422 standard.
2)
t
ALo-BHi
is not a specified value, but is the time between the falling edge of track A and the next but one rising edge of
track B.
3)
Further information on setting the "Zero pulse active time" can be found in the following:
References: SINAMICS S120 Drive Functions Function Manual, Section "Tolerant encoder monitoring"