Danfoss VLT 2800 User Manual

Data Character (byte)
The structure of data blocks depends on the type of
telegram. There are three types of telegram, and the
type of telegram applies for both control telegrams
(masterslave) and response telegrams (slavemaster).
The three types of telegram are:
-
Parameter block, used to transfer parame-
ters between master and slave. The data
block is made up of 12 bytes (6 words) and
also contains the process block.
-
The process block is made up of a data block
of four bytes (2 words) and contains:
-
Control word and reference value
-
Status word and present output fre-
quency (from slave to master)
-
Text block, which is used to read or write texts
via the data block.
Parameter commands and responses (AK).
Bits no. 12-15 are used to transfer parameter com-
mands from master to slave and the slave's processed
responses back to the master.
Parameter commands masterslave
Bit no.
15
14 13 12 Parameter command
0 0 0 0 No command
0 0 0 1 Read parameter value
0 0 1 0 Write parameter value in RAM
(word)
0 0 1 1 Write parameter value in RAM
(double word)
1 1 0 1 Write parameter value in RAM
and EEprom (double word)
1 1 1 0 Write parameter value in RAM
and EEprom (word)
1 1 1 1 Read/write text
Response slavemaster
Bit no.
Response
15 14 13 12
0 0 0 0 No response
0 0 0 1 Parameter value transferred (word)
0 0 1 0 Parameter value transferred
(double word)
0 1 1 1 Command cannot be performed
1 1 1 1 Text transferred
If the command cannot be performed the slave sends
this response: 0111 Command cannot be performed
and gives the following fault report in the parameter
value (PWE):
Response
(0111)
Fault report
0 The parameter number used
does not exist
1 There is no write access to the
defined parameter
2 Data value exceeds
the parameter's limits
3 The sub index used
does not exist
4 The parameter is not the array type
5 The data type does not match the
defined parameter
17 Data change in the defined para-
meter is not possible in the frequency
converter's present mode.
Certain parameters can only be changed
when the motor is turned off
130 There is no bus access to the
defined parameter
131 Data change is not possible because
factory Setup is selected
MG.27.E2.02 - VLT is a registered Danfoss trademark 113
Programming

Danfoss VLT 2800 Specifications

General

Brand	Danfoss
Model	VLT 2800
Category	DC Drives
Language	English