2
02
0-
11
180
Appendix
177
The segment is powered
and communication is
active, but no devices are
detected
Wrong fieldbus type
selected
Set fieldbus type to FOUN
-
DATION Fieldbus or PRO
-
FIBUS PA
178
Segment voltage is mea
-
sured as zero. Segment is
unpowered
Power supplies failed for
the segment
Check and replace fieldbus
power supplies
179
Segment voltage is "Out of
specification"
Power supply module
defect, Voltage is OOS
Replace power supply
module
182
Both fieldbus power sup
-
plies report failure
Trunk short circuit
Check trunk. If no spur
short circuit protection is
installed, also check spurs.
Power supplies failed for
the segment
Check and replace fieldbus
power supplies
183
No fieldbus power supply
installed
No power supply module
installed
Install power supply mod
-
ule for this segment
184
Segment voltage is mea
-
sured as zero. Segment is
unpowered
Trunk short circuit
Check trunk. If no spur
short circuit protection is
installed, also check spurs.
Fieldbus power supply
failed
Replace fieldbus power
supply module
Fieldbus power supply
removed
Install fieldbus power sup
-
ply
Terminal failure: loose con
-
nection
Check all terminals for cor
-
rect connection
Diagnostic device is
wrongly or not connected
to the segment
Check wiring connection to
the segment
185
Segment voltage is "Out of
specification"
Power supply module
defect, Voltage is OOS
Replace power supply
module
188
Signal level is 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
189
Signal level of one or more
devices is too high and
devices are missing com
-
pared to commissioning
Trunk breakage between
device couplers
Check trunk cable and
device coupler terminals
190
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
191
Signal level is too low:
OOS/MR
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
192
Signal level of one device
is MR/OOS (too low), sig
-
nal level of others is 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
ID
Phenomenon
Cause(s)
Action(s)