Beckhoff C1300 Manuel d'utilisateur télécharger pdf (Page 8)

C1300 VME to II/O Interface Unit Beckhoff II/O-System

Page 8 of 44 Version : 2.01 Date : 18.12.95

The contents of the telegram is mainly organized for each byte.

AD0 - AD7 create the address field.Using this address field up to 254 modules can be

addressed ( Address 00h and 0fh are reserved. ).

CR0 - CR3 define the type of telegram. Following functions can be defined in the telegram:

CR3 CR2 CR1 CR0 Function Beschreibung

0000

READ

The modul addressed writes the entry data into

the Data fields D0 - D3 .

0001

READ/WRITE

The modul addressed writes the entry data into

the Data fields D0 - D3 and loads the

Ausgangsinformation.

0010

ADDRESS INITIALIZITION

The module addressed loads the contents of D0

as a module address und sets D0 = 0.

0100

ADDRESS CHECK AND

COUNT COMMAND

Each module passed increases the contents of

D0 by 1. The module addressed is loads the

contents from D0 into D3.

1001

LOW INTENSITY

COMMAND

The module addressed reduces the transmission

intensity by 20%.

picture 3:Controlfield

Byte D0 - D3 contain the actual Data to use. The processing of this data is determined by the

controll field.

The last Byte in a telegram contains two spare bits and 6 bits to create a CRC checksum. The

contents, having a length of 50 bits, achieves a Hamming distance of d = 3.

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Beckhoff C1300 Manuel d'utilisateur Page 8