Siemens SIMATIC NET CP 142-2, Manual, Page: 29 / 84

B8976111/02 AS-i Master Module CP 142-2
3-7
3.3.1.2 Structure of PROFIBUS DP Slave Diagnostics
When a diagnostic interrupt is triggered on the CP 142-2, the BM 141/BM 142 reports PROFIBUS DP
slave diagnostic information with the following structure (for more detailed information, refer to /4/):
Figure 3-2 Structure of the DP Slave Diagnostic Information
To support special masters, the BM 141/BM 142 can also be configured so that the slave
diagnostic information only includes bytes 0 to 15. Refer to the information in /4/.
In a slave diagnostic message, the slot of the module that caused the diagnostic
message is indicated in bytes 7 and 8 (by setting a bit) as well as in byte 11 (slot
number). Slot 5 is the first slot beside the basic module.
Byte 0
Byte 1
Station status 1 to 3
Byte 2
Byte 3
Master PROFIBUS address
Byte 4 High byte Vendor
Byte 5 Low byte ID
Byte 6
Byte 7
ID-related diagnostics
Byte 8
Byte 9 14
H
: Length of the device-related diagnostics
Byte 10 01
H
: Code for S7 diagnostic interrupt
Byte 11
Slot of the module with diagnostic information
Byte 12
00
H
: reserved
Byte 13
Byte 14
Byte 15
Byte 16
Device-related diagnostic information
Byte 17
Data record 1
Byte 18 see Figure 3-3
Byte 19
Byte 20
Byte 21
Byte 22
Byte 23
Byte 24 00
H
: not used
Byte 25
Byte 26
Byte 27
Byte 28
00
H
: not used