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17 Software description of functions

Beckhoff Lightbus - PC interface card C1220

Example of a descriptor:

Telegram to I/O module 1 : D0 - D2 Outputs

D3 Input

The data for the output in D0 - D2 is fetched from the addresses 0x400,

0x302 and 0x210 in the DPRAM.

The data item for the input in D3 is stored at the address 0x30 in the

DPRAM.

Bytes Contents

0,1

0x01, 0x00

2,3

0x10, 0x00

4,5

0x00, 0x04

6,7

0x02, 0x03

8,9

0x10, 0x02

10,11

0xff, 0xff

12,13

0xff, 0xff

14,15

0xff, 0xff

16,17

0xff, 0xff

18,19

0x30, 0x00

Constants

At the DPRAM adress offset 0xEF0 - 0xFEF the constants 0x00 - 0xFF can

be found. To insert constants into the data bytes of the Lightbus telegrams,

you just have to set the descriptor to the corresponding offset.

The above-mentioned CDLs are split into parts so they can be transferred

via the handshake channel 0. In doing so, the information for a message

must not be split. Transfer can be activated with the function 0x10.

ArgumentChannel Length Function blank

0 1 2 ... n

Request

nn 0x10 00 aa bb db1,0 dbn,19

ArgumentChannel Length Function

0 1 2

Comment

04 0x10 aa 00 o.k.

04 0x10 aa 01 Error in CDL data

(e.g.: Pointer not in the DPRAM’s data area)

04 0x10 aa 02 CDL overflow

04 0x10 aa 03 Invalid descriptor length

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 29 30

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