XtraDrive-DP User Manual
Last printed: 6/1/03 4:21 PM
Ch3WorkingWith.doc
Last saved: 6/1/03 4:16 PM
42
Diagnostics
A PROFIBUS network enables a slave to report back to the master
regarding problems on the network.
Diagnostics take place during the normal process of data exchange.
To initiate a diagnostics request, XtraDrive-DP sends an error flag
in the frame control to the master. The master then sends a
diagnostic request that is answered by XtraDrive-DP.
The master can request diagnostic information at different times:
✦
Before downloading parameters, to make sure the field device
is available.
✦
Before entering the data exchange mode, to validate parameters
and configuration and make sure the field device is ready.
✦
During data exchange, whenever indicated by the field device.
The XtraDrive-DP diagnostic information that is sent to the master
consists of standard PROFIBUS diagnostic information, plus
additional diagnostic information for the XtraDrive-DP: alarms,
warnings, faults and command IDs.
The structure of an XtraDrive-DP diagnostic message is shown in
the following diagram:
Alarm (1 byte)
Warning (1 byte)
Fault (1 byte)
1
2
3
4
5
6
7
Standard
XtraDrive-DP
Extension
ID (2 bytes)
8
9
10
11
12
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