HEIDENHAIN PROFINET - Manual (Page 50)

Alarms and warnings
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5 Alarms and warnings
5.1 Diagnostics and Alarms
Diagnostic data is always transferred acyclically using Record Data
communications over the non real time channel. An IO Supervisor
must specifically request the diagnostic or status data from the IO
device using RDO (Record Data Object) services.
Alarm data is transmitted from the IO device to the IO controller
via the RT channel.
Alarm is generated by the encoder when failure occurs which ef-
fects the position value. Alarms can be reset (deleted) when all
encoder parameters are within the specified value ranges and the
position value is correct.
5.2 Channel diagnostics
The encoder outputs a diagnostic interrupt to the CPU when it de-
tects one of the supported channel diagnostics.
Supported channel
diagnostic Diagnostic data
record Description
Position error 0x900A The encoder fails to read the correct
position value
Memory error 0x9000 The encoder fails to read stored
offset or preset values from the non
volatile memory
Commissioning
diagnostics
0x9011 User parameter data assignment
error
Table 23 Channel diagnostics
In a SIMATIC STEP 7 system the operation system responds by
calling a diagnostic OB. The OB number and start information pro-
vides the cause and location of the error. The error information can
be read by calling a system Function block (SFB54 RALRM for
STEP 7). Then the user can decide how the system should handle
the error.
Note: If the called OB is not included in the program the CPU
will go to stop.