Danfoss VLT 6000 HVAC Manual de servicio descargar pdf (Pagina 123)

VLT

6000 HVAC

123MG.60.B1.02 - VLT is a registered Danfoss trademark

Programming

■ Data character (byte)

The build-up of data blocks depends on the type of

telegram. There are three types of telegram and the

telegram type applies to both control telegram

(master→slave) and reply telegram (slave→master).

The three types of telegram are the following:

1. Parameter block, used for transferring parameters

between master and slave. The data block has 12

bytes (6 words) and also contains the process

block.

PKE IND PWE

HIGH

PWE

LOW

PCD1 PCD2

Parameter block Process block

2. Process block, built up as a data block with four

bytes (2 words), covering:

- Control word and reference value

(from master to slave)

- Status word and present output frequency

(from slave to master).

PCD 1 PCD 2

Process block

3. Text block, used for reading or writing texts via the

data block.

PKE IND Ch 1 Ch2 Ch n PCD1 PCD2

Tekxt block Process block

1. Address format 1-126

The byte for the 1-126 address range has the

following profile:

76 543210

Bit 7 = 1 (address format 1-126 active)

Bit 0-6 = VLT frequency converter address 1-126

Bit 0-6 = 0 Broadcast

The slave sends the address byte back to the master

in the reply telegram in unchanged form.

Example:

A telegram is sent to VLT frequency converter address

22 using address format 1-31:

76 543210

Data control byte (BCC)

The data control byte can be explained by means of

an example: Before the first byte of the telegram is

received, the calculated check sum (BCS) is 0.

7 6 5 4 3 2 1 0

0 0000000

After the first byte (02H) has been received:

BCS = BCC EXOR "first byte"

(EXOR = exclusive-or gate)

BCS = 0 0 0 0 0 0 0 0

EXOR

"first byte"= 0 0 0 0 0 0 1 0 (02H)

BCC = 0 0 0 0 0 0 1 0

Each additional, subsequent byte is gated with BCS

EXOR and results in a new BCC, such as:

BCS = 0 0 0 0 0 0 1 0

EXOR

"second byte" = 1 1 0 1 0 1 1 0 (D6H)

BCC = 1 1 0 1 0 1 0 0

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 176 177

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Danfoss VLT 6000 HVAC Manual de servicio Pagina 123

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