Mitsubishi FX3U-USB-BD User Manual

H-43
FX Series PLC User's Manual - Data Communication Edition
Programming Communication
7 Troubleshooting
7.6 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
7.6 Checking Sequence Program
1. Checking the contents of the communication setting
Verify that no communication format (D8120, D8400 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
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, turn OFF the PLC power, and then turn the power ON again.
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, turn OFF the PLC power, and then turn the power ON again.
- 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, turn OFF the PLC power, and then turn the power ON again.
3. 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, turn OFF the PLC power, and then turn the power ON again.
4. 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, revise them, turn OFF the PLC power, and then turn the
power ON again.
5. Presence of EXTR instruction (in FX3G, 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 the power ON again.
6. 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, revise them, turn OFF the PLC power, and then turn the
power ON again.
*1. The IVBWR instruction is supported only in FX
3U and FX3UC PLCs.
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.
→ For the programming tool setting, refer to Chapter 6.

Mitsubishi FX3U-USB-BD Specifications

General

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