Siemens SINAMICS V20 Series Operating Instructions Manual page 189

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
respectively. 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.
P2013 = 3
P2013 = 4
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.
P2013 = 4, fixes PKW length.
Allows access to all parameters, but indexed parameters can only be read one index at a time.
Word order for single word values are different to setting 3 or 127, see example below.
P2013 = 127, most useful setting.
PKW reply length varies depending on the amount of information needed.
Can read fault information and all indices of a parameter with a single telegram with this setting.
Example:
Set P0700 to value 5 (P0700 = 2BC (hex))
SINAMICS V20 Inverter
Operating Instructions, 07/2012, A5E03728167
Range
0 - 127
No words
3 words
4 words
Variable
U16 (16 Bit)
USS / MODBUS on RS485
USS on RS232 (reserved)
P2013
PKE IND PWE
P2013
PKE IND
PKE
IND
PWE
Factory Can be
default changed
127 U, T
Data type
U32 (32 Bit)
X Parameter access fault
X
X
PWE
7.2 Parameter list
Scaling Data
set
- -
Float (32 Bit)
Parameter access fault
X
X
Parameter list
Data Acc.
type Level
U16 3
X
X
189