The Data Field; The Pke Field - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...

10.6.6 The Data Field

The structure of data blocks depends on the type of telegram. There are three telegram types, and the type applies for both
control telegrams (master⇒slave) and response telegrams (slave⇒master).
The 3 types of telegram are:
Process block (PCD)
The PCD is made up of a data block of 4 bytes (2 words) and contains:
- Control word and reference value (from master to slave)
- Status word and present output frequency (from slave to master)
STX LGE
Illustration 10.6 Process Block
Parameter block
The parameter block is used to transfer parameters between master and slave. The data block is made up of 12 bytes (6
words) and also contains the process block.
STX
10 10
Illustration 10.7 Parameter Block
Text block
The text block is used to read or write texts via the data block.
STX LGE
Illustration 10.8 Text Block

10.6.7 The PKE Field

The PKE field contains two sub-fields: Parameter command
and response AK, and Parameter number PNU:
184
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ADR
LGE ADR PKE IND
ADR PKE IND
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VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
PCD1
PWE PWE
high low
Ch1 Ch2
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Illustration 10.9 PKE Field
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MG33BE02 - VLT is a registered Danfoss trademark
PCD2
PCD1 PCD2
Chn PCD1 PCD2
PKE IND
AK PNU
BCC
BCC
BCC
PWE PWE
high low