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18. TROUBLESHOOTING
18.1 GOT Restoration Sheet
18 - 3
17
MAINTENANCE AND
INSPECTION
18
TROUBLESHOOTING
APPENDICES
(2) Status of the GOT when it freezes (screen operation stopped)
(3) Status of the PLC CPU
Phenomenon Cause/status Action
(e) Buzzer sound
Does not sound.
Buzzer sound:
( )
Example: The rhythm as three beeps, one beep,
and then two beeps is repeated.
Proceed to (2) Status of the GOT when it
freezes.
Continues to beep randomly.
Continues to beep in a
particular pattern.
Beeps continuously.
The read device of the system information may
have turned ON when the device was set, turning
ON the Buzzer output signal.
Check the setting of the read device.
When the Buzzer output signal has no error,
proceed to (2) Status of the GOT when it
freezes.
Phenomenon Cause/status Action
(a) Switching to the utility
Enabled
Error code (system alarm):
( )
Example: 460 Communication unit error
When the system alarm display function can
be used, take the action for the error code
(system alarm) displayed.
If the action cannot be taken, proceed to (2)-
(b).
Disabled
The system alarm display function cannot be
used.
Proceed to (2)-(c).
(b) Executing of I/O check from the GOT utility
Communication error
Display details:
( )
Example: A message indicating the cause may be
a connection error was displayed.
Proceed to (2)-(c).
No error
The hardware such as a communication interface
has no error.
Proceed to (3) Status of the PLC CPU.
(c) Objects not displayed on the monitor screen
Found
Details:
( )
Example: The numerical display object is not
displayed.
Proceed to (3) Status of the PLC CPU.
Not found
Phenomenon Cause/status Action
(a) PLC failure
Occurs always.
An error such as CONTROL-BUS. ERROR or SP.
UNIT LAY. ERROR may have occurred.
Error code (system alarm):
( )
Example: 1204 CPU H/W fault
Proceed to the following.
18.1
Occurs sometimes.
The PLC CPU may be influenced by noise or the
hardware may be faulty.
Occurrence frequency:
( )
Example: Once a month
Error code (system alarm):
( )
Example: 1204 CPU H/W fault
Proceed to (4) GOT restoration procedure.
Operates normally.
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