Danfoss VLT HVAC Basic Drive FC 101 Spécifications télécharger pdf (Page 85)

7.4.6 The Data Field

The structure of data blocks depends on the type of telegram. There are 3 telegram types, and the type applies for both

control telegrams (master⇒follower) and response telegrams (follower⇒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 follower)

Status word and present output frequency (from follower to master)

ADRLGESTX PCD1 PCD2 BCC

130BA269.10

Illustration 7.5 Process Block

Parameter block

The parameter block is used to transfer parameters between master and follower. 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 7.6 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 7.7 Text Block

RS-485 Installation and Set...

VLT

HVAC Basic Drive FC 101 Design Guide

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Danfoss VLT HVAC Basic Drive FC 101 Spécifications Page 85