14.5.6 Data Field
The structure of data blocks depends on the type of telegram. There are 3 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 14.7 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 INDADRLGESTX PCD1 PCD2 BCC
130BA271.10
PWE
high
PWE
low
Illustration 14.8 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 14.9 Text Block
Appendix Design Guide
MG16C302 Danfoss A/S © 11/2017 All rights reserved. 229
14 14
To Next Page
Loading...
Need help?
General