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6-1
Indicators and Error Processing
MS
Green Red
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-
: Lit
72
LOCK I/O PWR I/O
NS
Green Red
Yellow Green Yellow Red
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-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
: Flashing
: Not lit
Description
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-
Safety I/O communications
in progress (normal status)
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-
Standard I/O communica-
tions or message commu-
nications in progress
(normal status)
-
-
The DST1 performing ini-
tialization process or wait-
ing for configuration.
-
-
Waiting for safety or stan-
dard connection
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-
Communications timeout
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BusOff status (communi-
cations stopped due to
consecutive data errors)
Node address duplication
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-
Waiting for completion of
node address duplication
check at the master
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-
Switch settings are incor-
rect
System failure
Input/output power is not
supplied.
Section 6: Troubleshooting and Maintenance
Probable cause and
remedy
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?
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?
Reset the DST1 so that it
has a unique node ad-
dress, and then restart the
DST1.
Reset the DST1 so that it
has a unique node ad-
dress, and then restart the
DST1.
Check the node address,
and then restart the DST1.
Replace the DST1.
Check the following items.
Are cables broken? Is the
power voltage within speci-
fications?
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Table of Contents
Troubleshooting
