Danfoss VLT AutomationDrive FC 300 Series - The Data Field; The PKE Field

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)
ADRLGESTX PCD1 PCD2 BCC
130BA269.10
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.
PKE INDADRLGESTX PCD1 PCD2 BCC
130BA271.10
PWE
high
PWE
low
Illustration 10.7 Parameter Block
Text block
The text block is used to read or write texts via the data block.
PKE IND
130BA270.10
ADRLGESTX PCD1 PCD2 BCCCh1 Ch2 Chn
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:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
130BA268.10
PKE IND
PWE
high
PWE
low
AK PNU
Parameter
commands and replies
Parameter number
Illustration 10.9 PKE Field
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