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Status Area and Troubleshooting Section 9-2
Troubleshooting with the PWR Indicator
Troubleshooting with the T/R1 and T/R2 Indicators
9-2 Status Area and Troubleshooting
The status of the Unit and the communications status of the Controller Link
Unit is recorded in the Status Area of the PLC. The cause of errors can be
found by searching the Status Area. The Status Area can be read using a Pro-
gramming Console, the SYSMAC Support Software, or the Controller Link
Support Software.
This section explains the contents of the Status Area and tells how to trouble-
shoot errors recorded there.
indicator
status
Unit status Possible error Probable cause Probable remedy
Lit Power is being sup-
plied normally
--- --- ---
Not lit Power supply error Power supply
cables
Cables are loose. Check the cable connections.
Cables are broken. Check whether any of the cables
are broken.
Cable polarity is incorrect. Check the cable connections.
Power supply Power supply voltage or current is
wrong.
Check the power supply voltage,
and replace the power supply with
a Power Supply Unit that will pro-
vide a correct supply.
Repeater Unit The Repeater Unit is faulty. Replace the Repeater Unit.
indicator
status
Unit status Possible error Probable cause Probable remedy
Lit or
flashing
The Unit is commu-
nicating normally.
--- Unit operating normally. ---
Not lit Communications
error (transmission
signal error or no
signal)
Communica-
tions cables
Cables are loose. Check the cable connections.
Cables are broken. Check whether any of the cables
are broken.
Cable polarity is incorrect. Check the cable connections.
Noise interference in cables. Check the wiring environment of
the cables.
Other nodes The destination node does not
exist.
Check the destination Controller
Link Unit status (power supply,
cable connections).
The destination node has an
error.
Check the destination Controller
Link Unit status (baud rate setting,
terminating resistance settings,
statuses, error log, etc.).
Repeater Unit Terminating resistance is set
incorrectly.
Check the terminating resistance
setting for the network.
The baud rate setting is incorrect. Check that the same baud rate is
set for all nodes in the same net-
work.
Noise interference Check the operating environment
of the Unit.
The Repeater Unit is faulty. Replace the Repeater Unit.