02.2004 Communication / USS
Siemens AG 6SE7087-6QX70 (Version AD)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.1-17
The parameter 'SCom/SCB PKW #" P702:
♦ Minimum value: 0 (0 words)
♦ Maximum value: 127 (corresponds to: variable length)
♦ Permissible values for USS: 0, 3, 4 and 127.
If a change task with a PWE which is not 0, 3, 4 or 127 is issued to the
drive converter, the reply is "Task cannot be executed" with error value
104.
The low-part of the index (bit 0 to 7), depending on the task, describes
a definite element:
♦ desired array element in the case of indexed parameters,
♦ desired element of the parameter description,
♦ for indexed parameters with "index text": desired index text,
♦ for non-indexed parameters with "selection text": desired selection
text.
Bits 8 to 14 must as a general rule all be equal to 0. The only
exceptions are those parameters that are indexed and possess
"selection texts". In this case bit 9 must be set to 1 to clearly identify the
desired text type. The low-part then defines the desires "selection text".
Bit 15, together with bits 0 to 10 in the PKE, serves to constitute the
number of a parameters (see Parameter coding).
With regard to the task "Request (parameter element) descriptive
element" (= AK 4) or tasks relating to the reading/writing of indexed
parameters (= arrays), index value 255 has a special significance:
Task ID Meaning
4 The complete (parameter) description is requested
6
Request all values of the indexed parameter
This task can generate error message 102.
7, 8, 11
or 12
All values of the indexed parameter are to be changed.
These tasks can generate error message 102.
Table 8.1-8 Tasks with index value 255
Example
Error message 104
Parameter index
(IND) 2nd word
Special significance
of index value 255
(low-part)
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