Mitsubishi FX3U-485-BD User Manual

C-49
FX Series PLC User's Manual - Data Communication Edition
Parallel Link
9 Troubleshooting
9.4 Checking Sequence Program
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
9.4 Checking Sequence Program
1. Communication setting in the sequence program
Verify that N:N Network (D8173 to D8180) is not set. Using both the parallel link and N:N Network at the same
time is not allowed.
Verify that the communication format (D8120, D8400 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 cycle power to the PLC.
→ For communication setting, refer to Chapter 5.
2. Communication setting using parameters
Verify that the communication settings using parameters are suitable for use. If the communication settings
are not suitable for the purpose of use, communication will not function correctly.
After changing any setting, make sure to reboot the PLC’s power.
→ For communication setting, refer to Chapter 5.
3. Presence of VRRD and VRSC instructions
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/RS2 instruction (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.

Mitsubishi FX3U-485-BD Specifications

General

Brand	Mitsubishi
Model	FX3U-485-BD
Category	Controller
Language	English