Debugging functions, diagnostics and troubleshooting
10.7 Diagnostics of DP CPUs
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
10-33
Structure of the interrupt data when a diagnostic interrupt is generated in response to an operating
status change by the intelligent slave (after byte y+4)
Byte y+1 contains the code for a diagnostic interrupt (01
H
). The diagnostic data contains the
16 bytes of status information from the CPU. The figure below shows the allocation of the
first four bytes of diagnostic data. The next 12 bytes are always 0.
The data in these bytes correspond to the contents of data record 0 of diagnostic data in
STEP 7 (in this case, not all bits are used).
0: RUN mode
1: STOP mode
ID for address areas of intermediate
memory (constant)
Byte y+7
0: module OK
1: module error
Byte y+6
Byte y+5
Byte y+4
7
6 5 4 3 2 1 0 Bit no.
0 0 0 0 0 0 0
7
6 5 4 3 2 1 0 Bit no.
0 0 0 0 1 0 1 1
0 0 0 0 0
0 0
0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0 Bit no.
7
6 5 4 3 2 1 0 Bit no.
Note: Byte y+8 to byte y+19 are always 0.
Figure 10-6 Bytes y+4 to y+7 for a diagnostic interrupt (operating status change by intelligent slave)
