Siemens SINAMICS S120 Commissioning Manual page 102

Commissioning
2.11 Notes on commissioning SSI encoders
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
102
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 two 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 single turn
resolution of 16 bits and a multi turn resolution of 14 bits. The absolute position's
resolution is therefore 30 bits.
Commissioning Manual, (IH1), 07/2007 Edition, 6SL3097-2AF00-0BP7
Commissioning