Siemens SINAMICS S120 Combi - Page 245

Encoder system connection
10.2 Sensor Module Cabinet-Mounted SMC30
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7
245
Parameter
Designation
Threshold
Min.
Max.
Unit
"Zero pulse inactive time"
(before and after A=B=high)
t
Lo
640 (t
ALo-BHi
- t
Hi
)/2
4)
ns
"Zero pulse active time"
(while A=B=high and beyond)
5)
t
Hi
640 t
ALo-BHi
- 2*t
Lo
4)
ns
1)
Other signal levels according to the RS 422 standard.
2)
The absolute level of the individual signals varies between 0 V and VCC of the encoder system.
3)
Only with Article No. 6SL3055-0AA00-5CA2 and firmware version 2.5 SP1 or higher can this value be configured using
software. For older firmware releases and Article Nos. less than 6SL3055-0AA00-5CA2, the "low" threshold applies.
4)
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.
5)
Additional information on setting the "Zero pulse active time" can be found in the manual: SINAMICS S120, Function
Manual, tolerant encoder monitoring for SMC30
Table 10- 13 Encoders that can be connected
X520
(SUB-D)
X521
(terminal)
X531
(terminal)
Track
monitoring
Remote Sense
2)
HTL bipolar 24 V
Yes
Yes
Yes
No
HTL unipolar 24 V
1)
Yes Yes (however, a bipolar connec-
tion is recommended)
1)
No No
TTL bipolar 24 V
Yes
Yes
Yes
No
TTL bipolar 5 V
Yes
Yes
Yes
At X520
SSI 24 V/5 V
Yes
Yes
No
No
TTL unipolar
No
1)
Because the physical transmission media is more robust, the bipolar connection should always be used. The unipolar
connection should only be used if the encoder type does not output push-pull signals.
2)
A controller compares the encoder system supply voltage - sensed via the Remote Sense cables - with the reference
supply voltage of the encoder system, and adjusts the supply voltage for the encoder system at the output of the sensor
module until the required supply voltage is obtained directly at the encoder system (only for 5 V encoder system power
supply).