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Communications Mode CP 523

All information presented in the next three tables (7-29, 7-30, 7-31) is relevant in 3964(R) mode

only.

Table 7-29. Return Info and Error Flags in the Coordination Byte 'Send' (CBS) in ”3964(R)” Mode

* See Error Flags

The information returned in the CBS

following submission of a Send request

(A001

) depends on the value in byte 1.

If byte 1 contains 00

, CBS bit 7=0 means

either that a parameter error was

detected or that the Send request could

not be serviced even though the Send

buffer was free, as it was not preceded by

a”check module status” request.

CBS bit 7= 1 means that the Send buffer is

not free because the previous Send

request is still being serviced.

If byte 1 is 01

, CBS bit 7=1 means that the

request was accepted; the Send buffer is

now reserved for this request.

Description

Bit

76543210

0XX

Send buffer free

Send buffer not free

Response

Return info for A000

Return info for A001

0XX

1XX

7-54

EWA 4NEB 811 6044-02a

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 256 257

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Siemens KS7 Series Specifiche Pagina 159