8-11
Minor fault display Probable causes and remediesMeaning
E-15
SI-F/G Com Err
SYSMAC BUS
communications error.
An error occurred in the
SYSMAC BUS
communications line,
disrupting communications.
• The communications line was broken, short-cir-
cuited, or wired in reverse.
→ Check
the communications line
and correct the
trouble.
• Hardware on the Master end is faulty.
→ Check the Master and take necessary mea-
sures.
• Communications
data was damaged due to noise.
→ Use twisted-pair cables for communications
lines and ground all the shields on the Master
end.
• The Optional Card was damaged.
→ If wiring is correct and if the problem persists,
replace the Optional Card.
BUS
Option Com Err
CompoBus/D communications
error.
Communications error
occurred in the CompoBus/D
Communications Card.
• Communications cable was broken, short-cir-
cuited, or wired incorrectly.
→ Check wiring of communications cables and
correct the fault.
• Hardware on the Master end is faulty.
→ Check the Master and take necessary mea-
sures.
• Data was damaged due to noise.
→ Change to special communications cables or
shielded cables and ground the shields on the
Master end or power supply end.
→ Separate communications cables from other
lines
and install a noise filter on the power sup
-
ply.
• The Optional Card was damaged.
→ If wiring is correct and if the problem persists,
replace the Optional Card.
Maintenance Operations Chapter
8
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