Siemens SIMATIC Distributed I/O System DP/ASi Link, Руководство пользователя

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8-10
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
8.2.3 Structure of Diagnosis
The structure of the diagnostic message conforms with the PROFIBUS-DP
standard.
Note
The structure of the diagnostic message described below does not apply to a
default start-up (refer to section 8.2.9).
The diagnostic message for the IM308C contains 26 bytes of data. The struc-
ture of the complete diagnosis is shown in Table 8-6.
Table 8-6 Structure of diagnostic message
Byte(s) Contents
0 Station status 1
1 Station status 2
2 Station status 3
3 Station number, DP master
4 Manufacturer ID (801B
H
)
5
6 Header and length of module diagnosis
7 Module diagnosis
8 Header and length of first station diagnosis
9 Length of S7 area
10 Reserved
11 Reserved
12 – 15 Part 1 of diagnostic data
16 Length of second station diagnosis (ASi-specific part)
17 Length of S7 area
18 Reserved
19 Reserved
20 – 25 Part 2 of diagnostic data.
Introduction
Structure for
IM 308C
Diagnostics and Error Handling