GFK-2721A
Chapter 4 Diagnostics
4-9
4
Diagnostics for BEM003 PROFIBUS DP Networks
When using the BEM003 PROFIBUS DP Master module with the PNS, any loss or add fault
on PROFIBUS slave(s) connected to the BEM003 will
not
be displayed as PROFINET
module or submodule loss or add alarms. Instead, when a PROFIBUS slave is not
connected to BEM003, a Channel Diagnosis Appears alarm with channel error type 768 will
be reported to the PNC. The IO Fault table will display a circuit number that indicates the
PROFIBUS address of the lost PROFIBUS slave. When the PROFIBUS slave is able to
connect to the BEM003, a Channel Diagnosis Disappears alarm will be reported.
When using the BEM003 module, not all diagnostics in PROFIBUS slaves are reported on
PROFINET. The status of PROFIBUS slaves are reported in the BEM003 input data. The
diagnostics can be read by sending a memory mapped COMMREQ to the BEM003 module.
For details, see the VersaMax PROFIBUS Master Module User's Manual, GFK-2740.
Diagnosis Disappears alarms may be out of sequence with Diagnosis Appears alarms. For
Intelligent Modules (IC200ALG240/ALG331/ALG620/ALG630/MDD841), Diagnosis
Disappears alarms are generated by a polling process which may be slower than Appears
messages.
Example: When re-applying field power, new channel alarms such as Hi/Low alarms may
occur before the Loss of Field Power alarm clears.
