10 TROUBLESHOOTING
10.1.2 Initializing error information of the serial communication module
This section explains the ERR. LED ON factors and the error code initialization (clear) for the Q series C24.
(1) ERR. LED ON factors
When any of the following errors occurs, its error code is stored in the buffer memory corresponding to the interface (CH) where the error occurred, and the ERR. LED turns on.
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| Error code storage buffer memory |
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Cause of error | Address |
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CH1 | CH2 | Name | MC |
| procedure | tional | |
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| protocol | protocol | ||
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Switch setting error | 203H | Switch setting error, mode switching error |
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Mode switching error | storage area |
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256H | 266H |
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error |
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Data transmission error | 257H | 267H | Data transmission result storage area |
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Data reception error | 258H | 268H | Data reception result storage area |
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MC protocol transmission | 025AH | 026AH | MC protocol transmission error code |
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error |
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Monitoring device error | 2205H | 2305H | PLC CPU monitoring function execution |
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result |
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(2)Turning off the ERR. LED and initializing the error codes by GX
(a) When turning off the ERR. LED and initializing the error codes
By making the CH
ERR. clear request on the "Monitor/Test" screen, the ERR. LED of the Q series C24 turns off and the stored error codes are initialized.
(b) When initializing the communication error information
By making the Communication error clear request for CH
and to turn LED off on the "Monitor/test others" screen, the LEDs (ERR., NEU.) of the Q series C24 turn off and the communication error information is initialized.
(3)Turning off the ERR. LED and initializing the error codes by sequence program
(a)Input signals used to notify of error occurrences and output signals used to initialize the error code
I/O signal |
| Name of status information | Description/function | |
Input signal |
| XE | Error occurrence on CH1 side | Turns on upon error occurrence in CH1 interface. |
| XF | Error occurrence on CH2 side | Turns on upon error occurrence in CH2 interface. | |
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Output signal |
| YE | CH1 Error information initialization request | Turns on when initializing error code of interface on CH1 side. |
| YF | CH2 Error information initialization request | Turns on when initializing error code of interface on CH2 side. | |
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Initialization of error code is continuously performed when output signal (YE/YF) is on.
POINT
The CHn side error information can be initialized by an off request to the LED off request area (address 1H) of the buffer memory. By using output signals YE to YF, the error codes stored in the above buffer memory can further be initialized (cleared).
10 - 6 | 10 - 6 |