The Data Field - Danfoss VLT FC 102 Series Design Manual

Installation and Set-up

8.4.6 The Data Field

The structure of data blocks depends on the type of message. There are three message types, and the type applies for both
control messages (master⇒follower) and response messages (follower⇒master).
The three types of message are:
Process block (PCD)
The PCD is made up of a data block of four bytes (two words) and contains:
•
Control word and reference value (from master to follower)
•
Status word and present output frequency (from follower to master)
STX LGE
Figure 8.7 Process Block
8 8
Parameter block
The parameter block is used to transfer parameters between master and follower. The data block is made up of 12 bytes
(six words) and also contains the process block.
STX
Figure 8.8 Parameter Block
Text block
The text block is used to read or write texts via the data block.
STX LGE
Figure 8.9 Text Block
150
ADR
LGE ADR PKE IND
ADR PKE IND
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Design Guide
PCD1
PWE PWE
high low
Ch1 Ch2 Chn
PCD2
PCD1 PCD2
PCD1 PCD2
BCC
BCC
BCC
MG11BC22