Diagnostics
Alarm messages
10
Networking via PROFIBUS−DP
10.6
10.6.3
L
10.6−6
EDSPM−TXXX−9.0−11/2009
10.6.3 Alarm messages
) Note!
Alarm messages are only available in power section DP−V1.
Alarm messages supply information on the type and the cause of the alarm. An
alarm message has a maximum length of 20 bytes. Diagnostic messages can each
be transmitted with one alarm message.
There are two types of alarm messages:
l Diagnostic alarm
l Process alarm
In the case of a process alarm (e.g. open circuit), the additional alarm information
is 4 bytes long. The data is module−specific. For further information, refer to the
corresponding module description.
) Note!
In the case of a diagnostic event for channel/channel group 0 of a
module, either the channel or the module is defective.
l This event is transmitted even if the diagnostics are not
activated for channel/channel group 0 of the module.
The alarm status is contained in bytes 1 to 5:
Byte Assignment
Byte 1
Bit 5 ... 0 010100 Number of assigned bytes
Bit 7, 6 Code for device−specific diagnostics
Byte 2 Bit 6 ... 0
Alarm type
0000001 Diagnostic alarm
0000010 Process alarm
Bit7 Alarm code
Byte 3 Bit 7 ... 0
Module which triggered alarm
00000001 Module on slot 1
00000010 Module on slot 2
00000011 Module on slot 3
... ...
00001000 Module on slot 8
Byte 4 Bit 1, 0
00 Process alarm
01 Incoming diagnostic alarm
10 Outgoing diagnostic alarm
11 Reserved
Bit 2 0 Fix
Bit 7 ... 3
00000000 Alarm sequence 1
00000001 Alarm sequence 2
00000010 Alarm sequence 3
... ...
00000111 Alarm sequence 8
Description
Process alarm
Diagnostic alarm
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