Mitsubishi Electric GT14 User Manual page 363

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Phenomenon
(e) Buzzer sound
Does not sound.
Continues to beep randomly.
Continues to beep in a
particular pattern.
Beeps continuously.
(2) Status of the GOT when it freezes (screen operation stopped)
Phenomenon
(a) Switching to the utility
Enabled
Disabled
(b) Executing of I/O check from the GOT utility
Communication error
No error
(c) Objects not displayed on the monitor screen
Found
Not found
(3) Status of the PLC CPU
Phenomenon
(a) PLC failure
Occurs always.
Occurs sometimes.
Operates normally.
Cause/status
Buzzer sound:
(
Example: The rhythm as three beeps, one beep,
and then two beeps is repeated.
The read device of the system information may
have turned ON when the device was set, turning
ON the Buzzer output signal.
Cause/status
Error code (system alarm):
(
Example: 460 Communication unit error
The system alarm display function cannot be
used.
Display details:
(
Example: A message indicating the cause may be
a connection error was displayed.
The hardware such as a communication interface
has no error.
Details:
(
Example: The numerical display object is not
displayed.
Cause/status
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
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 (2) Status of the GOT when it
freezes.
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.
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).
Proceed to (2)-(c).
)
Proceed to (2)-(c).
Proceed to (3) Status of the PLC CPU.
)
Proceed to (3) Status of the PLC CPU.
Proceed to the following.
20.1
)
)
Proceed to (4) GOT restoration procedure.
)
20. TROUBLESHOOTING
20.1 GOT Restoration Sheet
17
Action
18
Action
19
20
21
22
Action
23
24
20 - 3

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