10 TROUBLESHOOTING
10.2 Error Code Tables
The following shows the error codes, error contents, and corrective action for errors that are generated during communication between the Q series C24 and an external device.
The signal name in the following table indicates the CH
side LED on status or communication error status that is stored into buffer memory address 201H/202H when an error occurs.
The CH
side LED on status and communication error status can be confirmed by GX Developer's System monitor or GX
For errors without a corresponding signal name entered to errors generated with the MC protocol communication, “NAK” comes on.
10.2.1 Error code table
The following shows the error codes, error contents, and corrective action for errors generated during communication using MC protocol (excluding A compatible 1C frame), non procedure protocol, and bidirectional protocol.
("
" in the table is the error code when the target CPU is not a Q/QnACPU.)
Error code |
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| Signal |
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| Protocol |
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Error |
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| Non |
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(Hexa- |
| Error Contents |
| Corrective action |
| Bidire- | |||
| name |
| MC | Proce- | |||||
decimal) |
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| dure | ctional |
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3E8H |
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| • See Troubleshooting of the |
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| QCPU (Q mode) maintenance |
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to | — |
| (Error detected by the CPU) | — |
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| and inspection user's manual |
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3FFFH |
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| and take corrective action. |
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4000H |
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| • See Appendix of the QCPU (Q |
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| mode) maintenance and |
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to | — |
| (Error detected by the CPU) | — |
| inspection user's manual |
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4FFFH |
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| (details) and take corrective |
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| action. |
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7101H | System error | • | The OS of the Q series C24 detected some error. | — | ( | 1) |
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7102H |
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| • Make the watchdog timer (timer |
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| 1) time longer. |
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7103H | PLC access error | • | Cannot communicate with the Q series C24 CPU. | C/N | • Check if the CPU can |
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| communicate in communication |
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| protocol No. "F". |
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7104H |
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to | System error | • | The OS of the Q series C24 detected some error. | — | ( | 1) |
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7116H |
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| • Number of request points exceeds the range for the |
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| command. |
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| • | A word device was designated in a bit units |
| • Check and correct the external |
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7140H | Request data error |
| command. | PRO |
| device transmit message and |
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| • | The last device No. exceeds the range. |
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| restart data communications. |
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| Given device last No. > Designated head device |
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| No. + Designated number of points |
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7141H | System error | • | The OS of the Q series C24 detected some error. | — | ( | 1) |
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| • | A device that cannot be designated by the given |
| • Check and correct the external |
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7142H | Device name error | PRO |
| device transmit message and |
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| command was designated. |
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| restart data communications. |
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| • Check and correct the external |
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7143H | Device No. error | • | The head device No. is out of range. | PRO |
| device transmit message and |
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| restart data communications. |
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7144H | Monitor data write | • | Monitoring was requested before the device to be | PRO | • Write the device to be monitored |
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| error |
| monitored was written. |
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| before issuing a monitor request. |
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7145H | Monitor PLC No. | • | The written PLC No. and PLC No. in the monitor | C/N | • Rewrite the monitor data. |
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error |
| request are different. |
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7146H | Monitor CPU model | • | The written CPU model name and the CPU monitor | C/N | • Rewrite the monitor data. |
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name error |
| name in the monitor request are different. |
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7147H | Written number of | • | The written number of monitoring points exceeds | PRO | • Check and correct the external |
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monitoring points |
| the designated range. |
| device transmit message and |
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| overrun error |
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| restart data communications. |
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10 - 15 | 10 - 15 |