Mitsubishi FX3U-232-BD User Manual page 279

FX Series PLC User's Manual - Data Communication Edition
Computer Link
8.4 Checking Sequence Program
1. Communication setting in the sequence program
Verify that the parallel link and N:N Network are not set. Verify that the communication format (D8120 and
D8420) is set correctly. Communication is not possible if a communication port is set twice or more.
After changing any setting, make sure to reboot the PLC's power.
2. Communication setting using parameters
Verify that the communication settings using parameters is suitable to the purpose of use.
If the communication settings are not suitable to the purpose of use, communication will not function correctly.
After changing any setting, make sure to reboot the PLC's power.
3. Presence of VRRD and VRSC instructions (in 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 and RS2 instructions (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.
and FX
3U 3UC
and FX PLCs)
3U 3UC
and FX PLCs)
3U 3UC
and FX PLCs)
2N 2NC
8 Troubleshooting
8.4 Checking Sequence Program
PLCs)
and FX PLCs)
3U 3UC
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