Siemens FM 458-1 DP - DPEVT Alarm Information, PROFIBUS DP

Communication blocks
Function Blocks - FM 458-1 DP 2-9
Edition 12.2004
2.2.3 DPEVT Alarm information, PROFIBUS DP
DPEVT
Expanded info
―
BO EXT OB I
―
Appropriate S7 alarm OB
STA I
―
Station
SLO I
―
Slot
SUB I
―
Sub-module
SBN I
―
Sub-network
YO1
DW
―
Diagnostic bytes 0, 1, 2 and 3
YO2
DW
―
Diagnostic bytes 4, 5, 6 and 7
YO3
DW
―
Diagnosebytes 8, 9, 10 and 11
YO4
DW
―
Diagnostic bytes 12, 13, 14 and 15
YO5
DW
―
Diagnostic bytes 16, 17, 18 and 19
YO6
DW
―
Diagnostic bytes ...
1)
YO21
DW
―
Diagnostic bytes ...
1)
QTS BO
―
Block status
YTS W
―
Status display
1)
normally invisible
The DPEVT function block (DP event) provides more detailed information
about a Profibus-DP process or diagnostics alarm. The information/data,
provided at the outputs, correspond to the information/data which a
SIMATIC S7 module also has when processing the appropriate alarm
OBs (e.g. OB40, OB55 etc.).
When an alarm event is output, all of the values at the outputs are
updated.
When the appropriate alarm occurs, the alarm task configured for this
purpose, is started, Within the alarm task, DPEVT reads-out the alarm
information. A new alarm of the same time is only detected again after
the alarm task has been completed.
When a communications error occurs, the cause is also output at output
YTS and the QTS output is set to "0".
Symbol
Brief description
Mode of operation