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Indicators and Error Processing Section 7-1
7-1 Indicators and Error Processing
: Lit : Flashing : Not lit
MS NS LOCK I/O
PWR
I/O Description Probable cause and remedy
Green Red Green Red Yellow Green Yellow Red
−−−Safety I/O communications in
progress (normal status)
−−−−−−RUN status
(DST1-XD0808SL-1 only)
−−−Standard I/O communications or
message communications in
progress (normal status)
−−−The DST1 performing initializa-
tion process or waiting for config-
uration.
−−−−Waiting for safety or standard
connection
−−−−Communications timeout Check the following items and restart the
DST1.
Are lengths of cables (trunk and branch
lines) correct?
Are cables broken or loose?
Are Terminating Resistors connected to
both ends of the trunk line only?
Is noise interference excessive?
−−−−BusOff status (communications
stopped due to consecutive data
errors)
Node address duplication Reset the DST1 so that it has a unique
node address, and then restart the DST1.
−−−−Waiting for completion of node
address duplication check
−−−−Switch settings are incorrect Check the node address, and then restart
the DST1.
Input
−
Output
System failure Check to see if the positive side of the
power supply is in contact with the signal
line.
Replace the DST1 if the system failure
still occurs after turning the power supply
ON again.
−−−−− Input/output power is not sup-
plied.
Check the following items.
Are cables broken?
Is the I/O power voltage within specifica-
tions?
−−−−− An error occurred in an input/
output circuit.
Check the following items.
• Has a ground fault occurred in the
signal line?
• Is the signal line broken?
• Are there any troubles with the con-
nected device?
• Is the power source (positive side) in
contact with the signal line?
• Has a short-circuit occurred in the
signal line?
• Is the discrepancy time setting suit-
able?
• Is the I/O power supply voltage within
specifications?
• Did an EDM error occur?
Details on the error can be read from the
Network Configurator.
−−−−− When dual channels are set: An
error occurred in the other chan-
nel.
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