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

Date : 18.12.95 Version : 2.01 Page 35 of 44

Function 12

: Free running communication

Function 12

enables a free running communication, which is executed by the

interface without a trigger of the VME system. The usual handshake to

synchronize communication and process image control via the GCB is not

necessary.

Channel Length Function Argument 0 Argument 1

Request

04 12 k pan

Channel Length Function Argument 0

Comment

03 12 00 00 says: ok

03 12 01 01 says: erroneous data

with:

pan process image number

k Command code

0 = disable free running

communication

1 = enable free running

communication

It is highly recommended to use this mode only with byte - oriented I/O functions,

due to the fact that no deterministic behaviour exists between request and response

data and between two adajcent read or write access events of the VME Master:

The process image data might result from different communication cycles.

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Beckhoff C1300 Manuale Utente Pagina 35