Siemens SINAMICS G110D - Page 176

Functions
6.11 Operation in fieldbus systems
SINAMICS G110D
176 Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
The PKE consists of two fields. Bits 12 - 15 contain the request identifier (AK) as shown in
the tables below. In this structure, parameter numbers are paged. Bits 10 - 0 of the PKE
comprise the parameter number within a page of 2000 parameters; the page is defined in
bits 10 - 15 of the IND word as shown in the figure below.
Image 6-35 PKE component structure
The request ID defines whether the parameter is to be read or written and also the data type
of the value being transferred. In addition it is possible to choose whether parameters are
written permanently to EEPROM or only to volatile memory. In order to maximise
compatibility with the USS protocol the task ID is retained in full.
Table 6- 62 Request IDs from master to slave
Request Identifier
Description
Response identifier
Positive
Negative
0
No request
0
7/8
1
Request parameter value
1/2
7/8
2
Modify parameter value (word)
1
7/8
3
Modify parameter value (double word)
2
7/8
4
Request descriptive element
3
7/8
6
Request parameter value (array)
4/5
7/8
7
Modify parameter value (array, word)
4
7/8
8
Modify parameter value (array, double word)
5
7/8
9
Request number of array elements
6
7/8
11
Modify parameter value (array, double word) and store in EEPROM
5
7/8
12
Modify parameter value (array, word) and store in EEPROM
4
7/8
13 Modify parameter value (double word) and store in EEPROM 2 7/8
14
Modify parameter value (word) and store in EEPROM
1
7/8
In general a PKW request results in a response from the slave. The response ID in the slave
response has different meanings from those in the master message and in particular
includes an error identifier which indicates that the first word of the PWE in the response
contains an error code.