Siemens SINAMICS V20 Operating Instructions Manual page 267

Parameter Function
P2013[0...1] USS PKW length
Defines the number of 16-bit words in PKW part of USS telegram. The PKW area can be varied. Depending
on the particular requirement, 3-word, 4-word or variable word lengths can be parameterized. The PKW
part of the USS telegram is used to read and write individual parameter values.
0
3
4
127
Example:
P2013 = 3
P2013 = 4
P2013 = 127
Index: [0]
[1]
Notice: USS protocol consists of PZD and PKW which can be changed by the user via P2012 and P2013 respec-
tively. P2013 determines the number of PKW-words in a USS-telegram. Setting P2013 to 3 or 4 determines
the length of the PKW words (3 = three words and 4 = four words). When P2013 set to 127 automatically
adjusts the length of the PKW words are required.
If a fixed PKW length is selected only one parameter value can be transferred.
In the case of indexed parameter, you must use the variable PKW length if you wish to have the values of
all indices transferred in a single telegram.
In selecting the fixed PKW length, it is important to ensure the value in question can be transferred using
this PKW length.
P2013 = 3, fixes PKW length, but does not allow access to many parameter values.
A parameter fault is generated when an out-of-range value is used, the value will not be accepted but the
inverter state will not be affected.
Useful for applications where parameters are not changed, but MM3s are also used.
Broadcast mode is not possible with this setting.
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
Range Factory
default
0 - 127 127
No words
3 words
4 words
Variable
U16 (16 Bit)
X
X
X
USS on RS485
USS on RS232 (reserved)
Can be Scaling
changed
U, T -
Data type
U32 (32 Bit)
Parameter access fault
X
X
Parameter list
8.2 Parameter list
Data Data Acc.
set type Level
- U16 3
Float (32 Bit)
Parameter access
fault
X
X
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