Siemens SINAMICS S120 Commissioning Manual page 150

Commissioning
2.14 Notes on commissioning SSI encoders
The waiting period starts again when:
● The 5 V power supply is applied to the encoder.
● Switchover to 24 V power supply after completed ramp-up of the encoder evaluation in
Note
There is a serial ramp-up (evaluation -> encoder) with the corresponding ramp-up times after
every disconnection and connection of the encoder.
Note
An external supply of the encoder with 24 V is permitted.
Parameterization
Predefined encoders
Several predefined SSI encoders are available for commissioning. These can be selected
from the STARTER's commissioning screens.
User-defined encoders
If there are no predefined entries for the encoder used, user-defined encoder data can be
entered on screens using the commissioning wizard.
Special settings
● Error bits (special case, several error bits)
● Fine resolution p0418 and p0419
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accordance with the parameterized voltage level.
If an SSI encoder has several error bits, the evaluation is activated in the list of experts as
follows using parameter p0434[x]:
Value = dcba
ba: Position of error bit in protocol (0 ... 63)
c: Level (0: Low level 1: High level)
d: Status of evaluation (0: Off, 1: On with 1 error bit, 2: On with 2 error bits ... 9: On with 9
error bits)
The following applies in the event of several error bits:
- The position specified under ba and the other bits are assigned in ascending order.
- The level set under c applies to all error bits.
Example:
p0434 = 1013
--> The evaluation is activated and the error bit is in position 13 and a low level.
p0434 = 1113
--> The evaluation is activated and the error bit is in position 13 and high level.
p0434 = 2124
--> The evaluation is activated and the 2 error bits are as of position 24 and high level
In order to make full use of the entire traversing range of the absolute encoder, the
position information, including fine resolution, must not exceed 32 bits.
Example:
An SSI encoder without incremental tracks is used. The encoder has a singleturn
resolution of 16 bits and a multiturn resolution of 14 bits. The absolute position's
resolution is therefore 30 bits.
Consequently, only a fine resolution of two bits can be set. Parameters p0418[x] and
p0419[x] in the list of experts should therefore be set to the value 2.
Commissioning Manual, (IH1), 01/2011, 6SL3097-4AF00-0BP1
Commissioning Manual