C-50
FX Series PLC User's Manual - Data Communication Edition
Parallel Link
9 Troubleshooting
9.5 Checking Absence/Presence of Errors
9.5 Checking Absence/Presence of Errors
Verify that errors have not occurred in the master station and slave station. Errors can be checked using the
flags shown below.
1. Checking the device M8072
While the parallel link is established, M8072 remains ON.
If M8072 is OFF, an error has occurred in the parallel link setting or communication.
2. Checking the device M8073
If the parallel link is not set correctly, M8073 turns ON.
If M8073 is ON, verify that the master station and slave station are set correctly in sequence programs.
3. Devices for checking link errors
1) Checking the error flags M8063 and M8438 (in the FX3G, FX3U and FX3UC)
If a communication error occurs in the parallel link, the serial communication error flag turns ON.
When ch1 is used, M8063 turns ON. When ch2 is used in the FX
3G, FX3U and FX3UC, M8438 turns ON.
When the serial communication error flag turns ON, the error code is stored in D8063 or D8438.
2) Checking the error code
When a communication error occurs in parallel link using ch 1, the error code is stored in D8063.
When a communication error occurs in parallel link using ch 2, the error code is stored in D8438.
The table below shows the details of error codes.
Caution
The devices for checking link errors are not cleared even after communication errors are reset.
Serial communication errors are cleared in FX
3G, FX3U and FX3UC PLCs when the power is turned off and on.
Serial communication errors are cleared in other PLCs when the mode is switched from STOP to RUN.
Device Error code Description Action
D8063
0000 No error
Verify that the parallel link
setting programs are set
correctly. Check the wiring
also.
6312 Character error in parallel link
6313 Sum check error in parallel link
6314 Format error in parallel link
D8438
(in FX
3G, FX3U and FX3UC)
0000 No error
3812 Character error in parallel link
3813 Sum check error in parallel link
3814 Format error in parallel link
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