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Advanced Diagnostics
Appendix
ID
296
297
298
299
300
301
Phenomenon
Segment / spur voltage is 0
V
Segment / spur voltage is
too low
Segment / spur voltage is
too low
Signal level of one device
is too low, signal level of
others OK
Signal level is too low
Signal level of devices is
too high and devices are
missing compared to com-
missioning
Cause(s)
Fieldbus power supply
failed
Fieldbus power supply
removed
Bulk power supply failed
Device coupler failed
Cable breakage, short cir-
cuit or terminal connection
failure
Diagnostic device is
wrongly or not connected
to the segment
Fieldbus power supply
failed
Terminal failure: corrosion
Fieldbus power supply
replaced with incompatible
model
Topology error - non-work-
ing topology
Fieldbus power supply
overload
Fieldbus power supply
failed
Fieldbus power supply
replaced with incompatible
model
Terminal failure: corrosion
Device coupler failed
Device malfunction: Signal
level is too low
Too many terminators
Too many terminators
Terminal failure: corrosion
Trunk breakage between
device couplers
Action(s)
Replace fieldbus power
supply module
Install fieldbus power sup-
ply
Check bulk power supply
Check device couplers and
device coupler terminals
Check cabling and termi-
nals
Check wiring connection to
the segment
Check and replace fieldbus
power supply
Check if the resistance of
any terminal is too high
Install correct fieldbus
power supply
Check if the topology is
valid according to the field-
bus specification
Check if there is any con-
nection between fieldbus +
and fieldbus - or remove
devices
Check and replace fieldbus
power supply
Install correct fieldbus
power supply
Check if the resistance of
any terminal is too high
Check device couplers and
device coupler terminals
Replace device
Check that one terminator
is installed on each end of
the trunk cable, but no
more than these two in total
Check that one terminator
is installed on each end of
the trunk cable, but no
more than these two in total
Check if the resistance of
any terminal is too high
Check trunk cable and
device coupler terminals
191
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