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Appendix B
Slave Diagnostics Message
Example of Extended Diagnostics
Below an example of Extended diagnostics data is given, using the definitions above. The 6 mandatory bytes
preceding them are not shown.
7
0
6
0
5
0
4
0
3
0
2
1
1
0
0
0 Header byte
Device specific
Device related diagnostics:
Device specific contents
diagnostics field
of length 3
0
1
0
0
0
1
1 Header byte
0
Module 1 has diagnostics
1
Module related diagnostics:
1
Channel related diagnostics:
Channel related diagnostics:
Module 14 has diagnostics
1
0
0
0
0
0
0
1 Module 1
0
1
0
0
0
1
0
0 Channel 4 (Input)
0
1
1
0
0
1
0
0 Overload, bit oriented
1
0
0
0
1
1
1
0 Module 14
0
0
0
0
1
0
0
0 Channel 8
1
0
0
0
0
1
1
1 High Limit exceeded, byte oriented
The figure above shows the extended diagnostics of a slave device, which contains:
• Device related diagnostics:
One header byte and three device specific diagnostics bytes are shown in this example. The contents of
the diagnostics is device specific.
• Module related diagnostics:
One header byte and three module diagnostics bytes. The first of three bytes indicates pending diagnostics in module1, the next byte indicates pending diagnostics in module14.
• Channel related diagnostics:
Two channel related diagnostics entries are shown: One for module 1 and one for module 14. In module 1,
Input channel 4, has detected an overload. In module 14, channel 8, has detected an high-limit exceeded
event.
B-5
PROFIBUS DP-V1 Error codes
The Error codes returned by a PROFIBUS DP-V1 slave device are defined in the PROFIBUS DP-V1 Extension
to the PROFIBUS standard. This section lists the Error codes, which can be returned as a result of a PROFIBUS DP-V1 MSAC1 services. From these codes, the user can determine the cause of the failure.
The figure below shows the two of the three Error code bytes, returned by a PROFIBUS DP-V1 slave device, in
case an MSAC1 service resulted in an error. The third byte, Error code 2, which is not shown below will always
contain user specific error codes.
7
6
5
4
3
2
1
0
Error decode byte
Error decode
7
6
5
4
3
2
1
0
Error code 1 byte
Error code
Error class
240