Checking Sequence Program - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
11.4

Checking Sequence Program

1. Communication settings in a sequence program
Verify that N:N Network (D8176 to D8180) and parallel link (M8070 and M8071) are not set.
Verify that the communication format (D8120, D8370, D8400 or D8420) is set correctly. If a communication
port is set more than once, communication is not possible.
2. Communication settings using parameters
Verify that the communication settings using parameters are correct. If the contents of the settings do not
agree, communication will not function correctly.
After changing any settings, make sure to turn OFF the PLC power, and then turn the power ON again.
3. Ethernet port setting (in FX
Verify that the same channel is not used in the Ethernet port setting. Do not set the channel used in non-
protocol communication (RS/RS2 Instruction). After changing the setting, make sure to reboot the PLC's power.
4. Presence of VRRD and VRSC instructions
1) Except FX
3G
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) In 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) In FX and FX
3U
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 ch1.
Use ch2, or delete these instructions.
After deleting these instructions, reboot the PLC's power.
5. Presence of IVCK, IVDR, IVRD, IVWR, IVBWR
FX , FX
3GC 3U
Verify that the IVCK, IVDR, IVRD, IVWR, IVBWR and IVMC 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. Only available for FX
6. Presence of ADPRW instructions (in FX
Verify that the ADPRW instructions are not being used for the same channel.
If these instructions are used for the same channel, delete them, and reboot the PLC's power.
7. 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.
8. Presence of RS and RS2 instructions
Verify that two or more RS/RS2 instructions are not being driven for the same channel.
If two or more RS/RS2 instructions are driven, modify the program so that only one RS/RS2 instruction is
driven.
9. Presence of FLCRT, FLDEL, FLWR, FLRD, FLCMD, and FLSTRD instructions (in FX
FX PLCs)
3UC
Verify that the FLCRT, FLDEL, FLWR, FLRD, FLCMD and FLSTRD 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.
F-88
, FX
3S 3G
, FX and FX PLCs
3U 3UC
PLCs
3UC
and FX PLCs)
3UC
and FX
3U 3UC
, FX , FX and FX
3GC 3U
*1
, and IVMC instructions (in FX
PLCs.
, FX , FX , FX
3S 3G 3GC
and FX PLCs)
2N 2NC
11 Troubleshooting
11.4 Checking Sequence Program
PLCs)
3UC
3S
and FX PLCs)
3U 3UC
, FX ,
3G
and
3U