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