Siemens 440 manual P20132 USS PKW length, 197, Datatype U16 Unit Def 127 Group

Issue 01/06 Parameter Description

P2013[2] USS PKW length				Min:	0
CStat:	CUT	Datatype: U16	Unit: -	Def:	127
P-Group:	COMM	Active: first confirm	QuickComm.: No	Max:	127

Defines the number of 16-bit words in PKW part of USS telegram.

Level

3

The PKW part consists of the PKE part (1. word), IND part (2. word) resp. PWE part (3. - n. word). In contrary to the IND and PKE part, the PWE part 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.

Possible Settings:

0No words

33 words

44 words

127Variable

Index:

P2013[0] : Serial interface COM link

P2013[1] : Serial interface BOP link

Example:

			Data type
		U16 (16 Bit)	U32 (32 Bit)	Float (32 Bit)
P2013	= 3	X	Parameter access fault	Parameter access fault
P2013	= 4	X	X	X
P2013	= 127	X	X	X

Notice:

USS protocol consists of PZD and PKW which can be changed by the user via parameters P2012 and P2013 respectively. Parameter P2013 determines the number of PKW-words in a USS-telegram.

Setting P2013 to 3 or 4 determines the length of the PKW (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

PKE IND PWE

1word

each 16 Bit

P2013 = 4	P2013
PKE	IND	PWE
PKE	Parameter ID
IND	Sub-index
PWE	Parameter value

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 (0700 = 2BC (hex))

			P2013 = 3	P2013 = 4		P2013 = 127
	Master →	MM4	22BC 0000 0005	22BC 0000 0000 0005	22BC	0000 0005 0000
	MM4 →	Master	12BC 0000 0005	12BC 0000 0000 0005	12BC	0000 0005
MICROMASTER 440 Parameter List						197
6SE6400-5BB00-0BP0