Mitsubishi GOT1000 GT15 User Manual page 524

(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.
20
20.1 GOT Restoration Sheet
- 4
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
Action
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.
Action
Proceed to the following.
20.2 Troubleshooting in Bus
Connection
)
)
Proceed to (4) GOT restoration
procedure.
)