Diagnostic Alarm, Module Failure Processing (Ob82, Ob86) - Siemens SINUMERIK 840D sl Function Manual
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P3: Basic PLC program for SINUMERIK 840D sl
13.10 Structure and functions of the basic program
13.10.5
Diagnostic alarm, module failure processing (OB82, OB86)
General
In the event of a diagnostic alarm or failure of an I/O module, organization block OB82 or OB86
is called (components of the basic program). The basic program block FC5 "Diagnostic alarm
and module failure" (Page 994) is called from these blocks.
Bus diagnostics
The DP slave modules of the PROFIBUS connections MPI/DP or DP1 are registered by the
basic program as group message in the form of a ready signal in the interface signal
● DB10.DBX92.0 (MPI/DP bus slaves OK)
● DB10.DBX92.1 (DP1 bus slaves OK)
● DB10.DBX92.2 (PN bus slaves OK)
The group message is derived from the LED status of the respective PROFIBUS (System state
list SZL 0x174).
Alarm Output
If a fault or a failure of a slave is detected, alarm 400551, 400552 or 400553 (fault on the MPI/
DP, DP or PN bus) is also signaled. The alarm is automatically deleted when the error is
removed.
Suppression of the alarm output 400551, 400552, 400553
By setting the individual bits to "TRUE", the output of the group fault message on the HMI is
suppressed:
● DB10.DBX92.4 (alarm suppression message 400551) = TRUE
● DB10.DBX92.5 (alarm suppression message 400552) = TRUE
● DB10.DBX92.6 (alarm suppression message 400553) = TRUE
It is irrelevant whether the bit is set before the error occurs or during and active error.
If removed (reset of the bit to "FALSE"), the appropriate message is displayed on the HMI in
the event of an error.
In addition, bits DBX92.4-6 are reset to "FALSE" during the control power-up, so that the
evaluation of the error messages is always activated after a control restart.
Note
By setting the bit, the fault monitoring for the complete bus line is deactivated!
854
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
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