Mitsubishi FX3U-422-BD - Checking the Absence;Presence of Errors

F-83
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
11 Troubleshooting
11.5 Checking the Absence/Presence of 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
11.4.1 Checking communication port settings (in FX3G, FX3U and FX3UC PLCs)
1. Checking the operation mode
In FX3G, FX3U and FX3UC PLCs, the communication port operation status can be checked.
D8389 stores the communication type code currently adopted in communication port ch0.
D8419 stores the communication type code currently adopted in communication port ch1.
D8439 stores the communication type code currently adopted in communication port ch2.
The table below shows the contents of the communication type codes.
If the operation mode is different, check the parameters and sequence programs.
11.5 Checking the Absence/Presence of Errors
1. Checking for communication errors
When a communication error occurs, the serial communication error flag turns ON.
In all PLCs except FX
3G, FX3U and FX3UC PLCs using the communication port, M8063 turns ON.
For FX
3G, FX3U and FX3UC PLCs using the communication port ch1, M8063 turns ON.
When communication port ch2 is used in FX
3G, FX3U and FX3UC PLCs, M8438 turns ON.
When the communication port ch0 is used in FX
3G PLCs, M8062 turns ON.
When the serial communication error flag turns ON, D8062, D8063 or D8438 stores the corresponding error
code.
2. Checking the error code
When the serial communication error flag turns ON, a corresponding error code shown below is stored in
D8063 or D8438.
*1. Ch0 is supported only in FX
3G PLCs.
When an error code above is stored, check the following items:
•Wiring
• Parameter settings
Code Description
0 Programming communication
2 Protocol dedicated to computer link
3 N:N Network
4 RS instruction
5 RS2 instruction
6 Parallel link
7 Inverter instruction
8 The variable analog potentiometer expansion board is used.
Error code
Contents of error
ch0 (D8062)
*1
ch1 (D8063) ch2 (D8438)
6201 6301 3801 Parity error, overrun error or framing error
6202 6302 3802 Defective communication character
6203 6303 3803 Communication data sum mismatch
6204 6304 3804 Defective data format
6205 6305 3805 Defective command
6206 6306 3806 Monitoring timeout
— 6307 3807 Modem initialization error
— 6308 3808 N:N Network parameter error
— 6312 3812 Parallel link parameter error
— 6313 3813 Parallel link sum error
— 6314 3814 Parallel link format error
— 6320 3820 Error in communication with inverter