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Diagnostics and Error Handling
8.2.8
Second Station Diagnosis with the S7/ M7 DP Master
Area
The second part of the station diagnosis is contained in bytes 17 to 23.
Contents
The contents of bytes 17 to 19 are shown in Table 8-17.
Table 8-17
Byte
ASi slave diagno-
Diagnostic bytes 20 to 23 indicate an ASi slave failure. In Table 8-18, you
sis
will see the assignment of the different bits to the ASi address.
Erroneous ASi slaves are marked "1".
Table 8-18
20
21
22
23
1
8-20
Structure of bytes 17 to 19 in diagnostic message
Con-
tents
17
60
Channel type (channel module)
H
18
00
Length of overall diagnostic information per channel
H
19
20
Number of channel modules
H
Assignment of the ASi address to bit positions, bytes 20 to 23
Byte
Bit (Corresponds to ASi Address)
7
6
5
7
6
5
15
14
13
23
22
21
31
30
29
This position is not assigned.
Contents
4
3
2
1
4
3
2
1
12
11
10
9
20
19
18
17
28
27
26
25
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
0
1
8
16
24
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