B-45
FX Series PLC User's Manual - Data Communication Edition
N:N Network
9 Troubleshooting
9.5 Checking Setting Contents and Errors
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter
Communication
F
Non-Protocol
Communication
(RS/RS2 Instruction)
G
Non-Protocol
Communication
(FX
2N
-232IF)
H
Programming
Communication
I
Remote
Maintenance
Apx.
Discontinued
models
3. Presence of VRRD and VRSC instructions (except FX3U and FX3UC PLCs)
1) 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, reboot the PLC’s power.
2) FX
3G PLC
- In the case of the 14 points and 24-point type
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.
- In the case of the 40 points and 60-point type
Verify that the VRRD and VRSC instructions are not used in the program.
If these instructions are used in the program, the communication function is not available in ch2.
Use ch1, or delete these instructions.
After deleting these instructions, reboot the PLC's power.
4. Presence of RS instruction (except FX3G, FX3U and FX3UC PLCs)
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 FX3G, 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, delete them, reboot the PLC’s power.
6. 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, then reboot the PLC’s power.
7. Presence of IVCK, IVDR, IVRD, IVWR, and IVBWR
*1
instructions (in FX3G, 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, delete them, reboot the PLC’s power.
*1. The IVBWR instruction is supported only in FX
3U and FX3UC PLCs.
9.5 Checking Setting Contents and Errors
1. Checking the setting contents
Verify that the N:N Network is set correctly.
Each FX PLC has devices for checking the setting. Verify that the correct contents are stored in the devices
shown in the table below.
If the correct contents are not stored in the devices above, check the sequence program.
Device Name Description
D8173 Station number settings status Provided to check the station number.
D8174 Slave station quantity setting status Provided to check the number of slave stations.
D8175 Refresh range setting status Provided to check the refresh range.
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