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Advanced Diagnostics
Appendix
ID
157
158
159
161
162
163
164
165
166
178
Phenomenon
Signal level of one device
is too low, signal level of
others OK
One device is missing
compared to commission-
ing
Signal level is too low
Segment powered and OK
but no communication
detected
Additional devices active
compared to commission-
ing
Devices are missing com-
pared to commissioning
Segment voltage is lower
compared to commission-
ing
Jitter is "MR/OOS" for the
segment
Signal level of one device
is too high, signal level of
others is OK
Cause(s)
Device malfunction: Signal
level is too low
Too many terminators
Spur short circuit
Spur breakage
Device failed
Device unintentionally
removed from the segment
Device intentionally
removed from segment
Too many terminators
Terminal failure: corrosion
Host/LAS/master commu-
nication fault
No host connected
Extra devices installed
Device coupler failed
Device intentionally
removed from segment
Fieldbus power supply
overload
Fieldbus power supply
failed
Fieldbus power supply
replaced with incompatible
model
Fieldbus impedance fault
Not enough terminators
Measurement executed at
spur
Action(s)
Replace device
Check that one terminator
is installed on each end of
the trunk cable, but no
more than these two in total
Check spur of the missing
device
Check spur cable and ter-
minals of the missing
device
Check and replace device
Reinstall device or execute
commissioning wizard
again
Execute commissioning
wizard again
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 host/LAS/master
Check if the host is
installed and correctly con-
nected to the segment
Remove extra devices or
execute commissioning
wizard again
Check device couplers and
device coupler terminals
Execute commissioning
wizard again
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 fieldbus topol-
ogy is valid. Check noise,
reduce high noise values.
Check if a terminator is
installed on both ends of
the trunk
Connect to proper mea-
surement point
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