Mitsubishi FX3U-232-BD User Manual page 608

FX Series PLC User's Manual - Data Communication Edition
Programming Communication
7.6 Checking Sequence Program
1. Checking the contents of the communication setting
Verify that no communication format (D8120 and D8420, N:N Network: D8173 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 FX
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 FX
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 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, revise them, turn OFF the PLC power, and then turn it ON
again.
5. Presence of EXTR instruction (in FX
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 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, revise them, turn OFF the PLC power, and then turn it ON
again.
7.7 Checking Programming Tool Setting
Verify that the setting contents in the programming tool are correct.
1. Checking the communication port
Verify that the communication port is set correctly.
2. Checking the transmission speed
Verify that the transmission speed is set correctly.
H-38
and FX
3U
and FX PLCs)
3U 3UC
and FX
3U 3UC
and FX PLCs)
2N
2NC
→ For the programming tool setting, refer to Chapter 6.
7.6 Checking Sequence Program
PLCs)
3UC
PLCs)
and FX
3U 3UC
7 Troubleshooting
PLCs)