Siemens MICROMASTER 420 - Page 55

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MICROMASTER 420 Reference Manual
Issue A1
47
3.3.4 Tasks and reply for USS
Table 3-1 Defined Task ID
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0No task. 0 -
1 Request parameter value. 1 or 2 7
2 Change parameter value (word) [RAM only]. 1 7 or 8
3 Change parameter value (double word) [RAM only]. 2 7 or 8
4 Request description element. 3 7
5 Change description element (not possible with MICROMASTER 420). - -
6 Request parameter value (array) i.e. indexed parameter. 4 or 5 7
7 Change parameter value (array, word) [RAM only]. 4 7 or 8
8 Change parameter value (array, double word) [RAM only]. 5 7 or 8
9 Request the number of array elements i.e. no. of indices. 6 7
10 Reserved. - -
11 Save parameter value (array, double word) [RAM and EEPROM]. 5 7 or 8
12 Save parameter value (array, word) [RAM and EEPROM]. 4 7 or 8
13 Save parameter value (double word) [RAM and EEPROM]. 2 7 or 8
14 Save parameter value (word) [RAM and EEPROM]. 1 7 or 8
15 Read or change text (not possible with MICROMASTER 420). - -
If the length of PKW is fixed (3 or 4) using P2013, then the Master must always
correctly send either 3 or 4 words in the PKW area (if not, the slave will not
respond to the telegram). The slave reply PKW will be either 3 or 4 words as well.
If a fixed length is used with MICROMASTER 420, this should be 4, as 3 would not
be sufficient to support many of the parameters (i.e. double words). For variable
length of PKW (127) the Master sends only the necessary number of words for the
task in the PKW area. The length of the reply telegram will also only be as long as
necessary.
The examples shown later should explain this more clearly.
Table 3-2 Defined Reply ID
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0 No reply. 0
1 Transfer parameter value (word). 1, 2 or 14
2 Transfer parameter value (double word). 1, 3 or 13
3 Transfer description element. 4
4 Transfer parameter value (array, word). 6, 7 or 12
5 Transfer parameter value (array, double word). 6, 8 or 11
6 Transfer the number of array elements. 9
7 Task cannot be executed (with error value). 1 to 15
8 No change rights for the parameter interface. 2, 3, 5, 7, 8,
11 to 14 or 15 (and change text).
9 – 12 Not used. -
13 Reserved. -
14 Reserved. -
15 Transfer text. 15