2
02
0-
11
174
Appendix
115
Signal level of one device
is too low for the given
topology, signal level of
others OK
Device malfunction: Signal
level is too low
Replace device
Too many terminators
Check that one terminator
is installed on each end of
the trunk cable, but no
more than these two in total
116
Signal level of one device
is too high for the given
topology
Measurement executed at
spur
Connect to proper mea
-
surement point
117
Segment voltage is too low Terminal failure: corrosion Check if the resistance of
any terminal is too high
Topology error - non-work
-
ing topology
Check if the topology is
valid according to the field
-
bus specification
Cable resistance is too
high
Check if the correct cable
is installed and the cable
can be used for the topol
-
ogy
Topology error - installed
topology does not match
configured topology
Check that the topology
settings match the installa
-
tion
120
Signal level is too high,
only host is active and seg
-
ment is powered
Trunk breakage between
fieldbus power supply and
first device coupler
Check trunk, fieldbus
power supply terminals
and first device coupler
121
Signal level of one or more
devices is too high
Not enough terminators
Check if a terminator is
installed on both ends of
the trunk
Trunk breakage between
device couplers
Check trunk cable and
device coupler terminals
Topology error - installed
topology does not match
configured topology
Check that the topology
settings match the installa
-
tion
122
Signal level of one or more
devices is too low for the
given topology
Too many terminators
Check that one terminator
is installed on each end of
the trunk cable, but no
more than these two in total
Terminal failure: corrosion Check if the resistance of
any terminal is too high
Cable resistance is too
high
Check if the correct cable
is installed and the cable
can be used for the topol
-
ogy
Topology error - installed
topology does not match
configured topology
Check that the topology
settings match the installa
-
tion
123
Voltage of Bulk Power Sup
-
ply (Primary or Second
-
ary) is "Out of
specification"
Bulk power supply voltage
error
Check and correct voltage
of bulk power supply
ID
Phenomenon
Cause(s)
Action(s)
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