Checking Sequence Program - Mitsubishi FX3U-USB-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Remote Maintenance
8.6.3

Checking sequence program

1. Checking the contents of the communication setting
Verify that no communication format (D8120, D8400, D8420), 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
1) Except FX
3U
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 PLC
3G
- 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 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 the power 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 the
power 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 the power ON again.
6. Presence of IVCK, IVDR, IVRD, IVWR, and IVBWR
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
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.
and FX PLCs
3UC
2N
, FX and FX PLCs)
3G 3U 3UC
, FX and FX
3G 3U 3UC
and FX PLCs)
2NC
*1
instructions (in FX
and FX PLCs.
3U 3UC
→ For the programming tool setting, refer to Chapter 6.
8 Troubleshooting
8.7 Checking Programming Tool Setting
PLCs)
, FX and FX
3G 3U 3UC
A
B
C
D
E
F
G
H
I
Apx.
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