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Advanced Diagnostics
Appendix
ID
105
106
107
108
109
110
111
112
113
Phenomenon
The segment is powered
and communication is
active, but no devices are
detected
Segment powered and OK
but no communication
detected
Segment voltage is out of
range for the given topol-
ogy
Noise is "Out of specifica-
tion" for the segment
Jitter is "Out of specifica-
tion" for the segment
Jitter of one device is "Out
of specification", jitter is not
"Out of specification" for
the other devices
Unbalance is "Out of speci-
fication" to fieldbus +
Unbalance is "Out of speci-
fication" to fieldbus -
Noise of one device is "Out
of specification", noise is
not "Out of specification"
for the other devices
Cause(s)
Wrong fieldbus type
selected
Host/LAS/master commu-
nication fault
No host connected
Wrong fieldbus power sup-
ply installed or wrong topol-
ogy configured
Noise injection on the field-
bus
Shield wiring / grounding
fault
Fieldbus impedance fault
Wrong cable type, cable
impedance not correct
Not enough terminators
Device malfunction: jitter of
a device is too high
Not enough terminators
Fieldbus impedance fault
Short circuit/leakage cur-
rent between fieldbus pos.
pole and shield/ground
Water ingress
Short circuit/leakage cur-
rent between fieldbus neg.
pole and shield/ground
Water ingress
Device injects noise
Action(s)
Set fieldbus type to FOUN-
DATION Fieldbus or PRO-
FIBUS PA
Check host/LAS/master
Check if the host is
installed and correctly con-
nected to the segment
Replace fieldbus power
supply or correct topology
settings
Check fieldbus cable for
correct shielding and
grounding. Check for exter-
nal noise sources.
Check fieldbus cable for
correct shielding and
grounding.
Check if the fieldbus topol-
ogy is valid. Check noise,
reduce high noise values.
Check if the correct cable
is installed and the cable
can be used for the topol-
ogy
Check if a terminator is
installed on both ends of
the trunk
Replace device
Check if a terminator is
installed on both ends of
the trunk
Check if the fieldbus topol-
ogy is valid. Check noise,
reduce high noise values.
Remove connection
between pos. pole and
shield/ground
Check housings of devices
and junction boxes for
water ingress
Remove connection
between neg. pole and
shield/ground
Check housings of devices
and junction boxes for
water ingress
Check noise with the field-
bus oscilloscope. The
device showing high noise
values is not necessarily
the one injecting the noise.
173
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