Euchner AS-i 3.0 Command Interface Uživatelský manuál stáhnout pdf (Strana 19)

AS-i 3.0 Command Interface Commands of the Command Interface

Subject to reasonable modifications due to technical advances Id.-No.: 102875 Issue date - 3.12.2007 EUCHNER GmbH + Co. KG

Kohlhammerstraße 16, D-70771 Leinfelden-Echterdingen Tel. +49/711/7597-0, Fax +49/711/753316

4.2.5 RD_74_DIAG

With this function the diagnosis string of a slave according to profile S-7.4 is being

read. Since the string can be longer than the command interface, it is written into

the buffer. The content of the buffer can be read in parts from index i.

The first byte of the buffer indicates the length of the read string.

If i ≡ 0, the string is being read from the slave, otherwise the function responses

out of the memory, the data can be read consistently.

4.3 Acyclic commands

4.3.1 Overview of the commands

4.3.2 WRITE_ACYCLIC_TRANS

This function starts various types of acyclic transfer (S-7.4, S-7.5 and Safety Mon-

itor). The transfer is performed in the background. The result must be read using

READ_ACYC_TRANS. The function is intended to be a replacement for the func-

tions (RD_74_75_PARAM, WR_74_75_PARAM, RD_74_75_ID, RD_74_DIAG

and "Safety at Work" monitor diagnostics), as it runs in the background and does

not stop the AS-i master during the transfer.

As the data to be transferred can be longer than the command interface, the data

is first written to a buffer in sections before the transfer is started.

Request

byte

15D

2T – circuit

3 slave address

Response

byte

15D

2T result

3 buffer byte i

……

n+2 buffer byte i+n-1

Values for command

see page Command Value Meaning

Req

Len

Res

Len

page 19

WRITE_ACYC_TRANS

write acyclic transfer ≥72

page 21

READ_ACYC_TRANS

read acyclic transfer 5 ≥2

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 97 98

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