Siemens KS7 Series Specifiche Scaricare il pdf (Pagina 156)

CP 523 Communications Mode

Example: Reading coordination information after "Receive message frame"

Start address 128 is set on the CP 523. If the CP has received message frames from the peripheral

device, these are to be transferred to the CPU. The message frames transferred from the

peripheral device have a fixed length of four bytes. The message frame is to be stored on the CPU

in DB 21 beginning DW 0.

* 5.2

STL FB 120 Explanation

NAME :RECEIVE1

:L KH A080

:T PW 128*

:L KH 0080

:L PW 128

:AW

:><F

:BEC

:C DB 21

:L KH 0000

:T PW 128*

:L PW 130

:T DW 1

:L PW 128

:T DW 0

:BE

Load "Receive message frame" into ACCUM 1 and transfer

to word 0 of the transfer memory.

Check that the Receive mailbox is empty

Read the coordination data

If the Receive mailbox is empty,

Block End

If it is not empty, open DB 21 and read out message frame data

Read word 2 of the transfer memory

and store in DW 1

Read word 0 of the transfer memory

and store in DW 0

Block End

Example: Parity check

Start address 128 is set on the module. FB 120 is to be invoked when a parity error is detected. The

error is processed in FB 120, for instance by requesting the peripheral device to retransmit the

frame.

* 5.2

STL FB 121 Explanation

:L KH A080

:T PW 128*

:L PW 128

:L KH 0F00

:AW

:L KH 0A00

:!=F

:JC FB 120

NAME :PARCHECK

:BE

Fetch data frame

from CP 523

Read module status

Blank error

Has a parity error been detected?

If yes, jump to FB 120;

If no, block end

EWA 4NEB 811 6044-02a

7-51

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 256 257

Commenti su questo manuale

Nessun commento

Siemens KS7 Series Specifiche Pagina 156

Commenti su questo manuale

Prodotti e manuali riguardandi no Siemens KS7 Series