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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
11-27
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The interrupt status of module diagnostics provides details on a DP slave. The
maximum length of module diagnostics starting at byte y is 20 bytes.
The following figure describes the structure and content of the bytes for a
configured address area of intermediate memory.
Byte y +1
01H: Code for diagnostics interrupt
Byte y +4
to
Byte y +7
Byte y
Length of the device-related diagnostics incl. byte y
(max. 20 bytes)
Code for device-related diagnostics
Byte y +3
Slot No.
2
= CPU
4...35 = No. of the configured address area
00 = No additional information
on diagnostic status
01 = Incoming diagnostics
10 = Outgoing diagnostics
11 = Outgoing diagnostics,
but there are still
disturbances
(there is at least 1 error)
Byte z
7
6 5 4
3 2 1 0
Bit No.
0 0
7 6
5 4 3
2 1 0 Bit No.
Example on byte y+2
CPU
= 02H
1. Address area
= 04H
2. Address area
= 05H
Byte y +2
0
0 0 0 0
0
Diagnostics or interrupt data
.
.
.
Only for
diagnostic
interrupt
02H: Code for process interrupt
of the intermediate memory
etc.
Figure 11-9 Structure of the interrupt status
