I-50
FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
8 Troubleshooting
8.7 Checking Programming Tool Setting
8.6.3 Checking sequence program
1. Checking the contents of the communication setting
Verify that no communication format (D8120, N:N Network: D8176 to D8180, and Parallel Link: M8070 and
M8071) is being used in the sequence program.
If any communication format is being used in the sequence program, communication will not function
correctly.
2. Presence of VRRD and VRSC instructions (except FX3U and FX3UC PLCs)
Verify that the VRRD and VRSC instructions are not used in the program.
If these instructions are used, delete them, turn OFF the PLC power, and then turn it ON again.
3. Presence of RS instruction (except FX3U and FX3UC PLCs)
Verify that the RS instruction is not used in the program.
If this instruction is used, delete it, turn OFF the PLC power, and then turn it ON again.
4. Presence of RS and RS2 instructions (in FX3U and FX3UC PLCs)
Verify that the RS and RS2 instructions are not being used for the same channel.
If these instructions are used for the same channel, revise them, turn OFF the PLC power, and then turn it ON
again.
5. Presence of EXTR instruction (in FX2N and FX2NC PLCs)
Verify that the EXTR instruction is not used in the program.
If this instruction is used, delete it, turn OFF the PLC power, and then turn it ON again.
6. Presence of IVCK, IVDR, IVRD, IVWR, and IVBWR instructions (in FX3U and FX3UC PLCs)
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, revise them, turn OFF the PLC power, and then turn it ON
again.
8.7 Checking Programming Tool Setting
Verify that the setting contents in the programming tool are correct.
1. Checking the telephone number
Verify that the telephone number of the connection destination is set correctly.
2. Checking the AT command setting
Verify that the AT command is set correctly for the registered modem.
3. Checking the communication port
Verify that the communication port connected to the modem is set correctly.
→ For the programming tool setting, refer to Chapter 6.
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