Mitsubishi FX3U-232-BD User Manual page 197

FX Series PLC User's Manual - Data Communication Edition
Parallel Link
3. Presence of VRRD and VRSC instructions (except FX
Verify that the VRRD and VRSC instructions are not used in the program.
If these instructions are used, delete them, reboot the PLC's power.
4. Presence of RS instruction (except FX
Verify that the RS instruction is not used in the program.
If this instruction is used, delete it, reboot the PLC's power.
5. Presence of RS/RS2 instruction (in FX
Verify that the RS and RS2 instructions are not being used for the same channel.
If these instructions are used for the same channel, delete them, reboot the PLC's power.
6. Presence of EXTR instruction (in FX
Verify that the EXTR instruction is not used in the program.
If this instruction is used, delete it, then reboot the PLC's power.
7. Presence of IVCK, IVDR, IVRD, IVWR, and IVBWR instructions (in FX
Verify that the IVCK, IVDR, IVRD, IVWR and IVBWR instructions are not being used for the same channel.
If these instructions are used for the same channel, delete them, reboot the PLC's power.
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 FX
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
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.
Device
D8063
D8438
(in FX and FX
3U
Caution
The devices for checking link errors are not cleared even after communication errors are reset.
They are cleared when the PLC mode is changed from STOP to RUN.
3U
3U
and FX
2N
Error code
0000 No error
6312 Character error in parallel link
6313 Sum check error in parallel link
6314 Format error in parallel link
0000 No error
3812 Character error in parallel link
)
3UC 3813 Sum check error in parallel link
3814 Format error in parallel link
9.5 Checking Absence/Presence of Errors
and FX
3U 3UC
and FX PLCs)
3UC
and FX PLCs)
3UC
PLCs)
2NC
and FX )
3U 3UC
and FX
3U
Description
9 Troubleshooting
PLCs)
and FX PLCs)
3U 3UC
, M8438 turns ON.
3UC
Action
Verify that the parallel link
setting programs are set
correctly. Check the wiring
also.
C-47
A
B
C
D
E
F
G
H
I
Apx.