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11.5.6 Data Field
The structure of data blocks depends on the type of telegram. There are 3 types, and the type applies to 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).
ADR
LGE
STX
PCD1
PCD2
BCC
130BA269.10
Illustration 11.7 PCD
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
IND
ADR
LGE
STX
PCD1
PCD2
BCC
130BA271.10
PWE
high
PWE
low
Illustration 11.8 Parameter Block
Text block
The text block is used to read or write texts via the data block.
PKE
IND
130BA270.10
ADR
LGE
STX
PCD1
PCD2
BCC
Ch1
Ch2
Chn
Illustration 11.9 Text Block
Appendix
VLT® AutomationDrive FC 361
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