Siemens KS7 Series Spezifikationen PDF herunterladen (Seite 167)

Communications Mode CP 523

Figure 7-9. Contents of the Transfer Memory for "Send Message Frame"

Word 6

Data

CPU transfers last message block ( 8 bytes)

CPU transfers further message block (8 bytes each)

CPU issues the "Send message frame" request

End here if CP has not

accepted the Send request!

CPU reads Coordination information

CPU transfers 1st message block (8 bytes)

Word 0

job No.

A001

Word 2

Send length

in bytes

Word 4

End-of-text

character

Word 6

Not

significant

Word 0

Coordina-

tion

informa-

tion

Word 2

Byte 2: CBS

(coordina-

tion

byte

for

'Send')**

Word 4

Not

significant

Word 6

Byte 6/byte

7: No. of

subframes/

number of

message

frames

Word 0

Data

Word 2

Data

Word 4

Data

Word 6

Data

- reads job number from

transfer memory

- writes coordination

information into the

transfer memory

CP reads data from the

transfer memory and stores

it in the Send mailbox

CP reads data from the

transfer memory and stores

it in the Send mailbox

-CP

reads data from the

transfer memory and

stores it in the

Send maibox

- transfers message frames

autonomously

from the

Send mailbox

to the peri-

pheral

device

- accepts no Send requests

during this time!

Word 0

Data

Word 2

Data

Word 4

Data

Word 6

Data

Word 2

Data

Word 4

Data

CPU user program CP functions

Word 0

Data

* only if Send length = 0 bytes

** relevant only in 3964(R) mode

8-byte

trans-

fer

memo-

ry in

the

CP 523

7-62

EWA 4NEB 811 6044-02a

1 2 ... 162 163 164 165 166 167 168 169 170 171 172 ... 256 257

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