Siemens SINAMICS Equipment Manual page 97

Parameter
"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 VCC of the encoder system.
2)
Only with order number 6SL3055-0AA00-5CA2 and firmware version 2.5 SP1 or higher can this value be configured using
3)
software. For older firmware releases and Order Nos. less than 6SL3055-0AA00-5CA2 then the "low" threshold applies.
t 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
4)
ALo-BHi
B.
Table 7-8 Encoders that can be connected
HTL bipolar 24 V
HTL unipolar 24 V
1)
TTL bipolar 24 V
TTL bipolar 5 V
SSI 24 V/5 V
TTL unipolar
Because the physical transmission media is more robust, the bipolar connection should always be used. The unipolar
1)
connection should only be used if the encoder type does not output push-pull signals.
A controller compares the encoder system supply voltage - sensed via the Remote Sense cables - with the reference supply
2)
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).
Maximum encoder cable lengths
Table 7-9
Encoder type
TTL
HTL unipolar
HTL bipolar
SSI
For TTL encoders at X520 → remote sense → 100 m
1)
Because the physical transmission media is more robust, the bipolar connection should always be
2)
used. The unipolar connection should only be used if the encoder type does not output push-pull
signals.
See the diagram "Maximum cable length depending on the SSI baud rate for SSI encoders"
3)
Supplementary component descriptions
Manual, 06/2019
Designation
t
Lo
t
Hi
X520 X521
(SUB-D) (terminal)
Yes
Yes Yes (however, a bipolar connec‐
tion is recommended)
Yes
Yes
Yes
Maximum encoder cable length
1)
2)
Sensor Module Cabinet-Mounted SMC30
Threshold Min.
640
640
X531
(terminal)
Yes
1)
Yes
Yes
Yes
no
Maximum encoder cable length in m
7.4 Technical data
Max.
(t - t )/2
4)
ALo-BHi Hi
t - 2*t
4)
ALo-BHi Lo
Track Remote Sense
monitoring
Yes
no
Yes
Yes At X520
no
100
100
300
100
3)
Unit
ns
ns
2)
no
no
no
no
95