FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
281
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.6 Judgment by Error Codes and Representation of Error Codes
11
High-Speed
Counters
12
Output Wiring
13
Wiring for
Various Uses
14
Test Run,
Maintenance,
Troubleshooting
15
IInput/Output
Powered
Extension Units
16
Input/Output
Extension
Blocks
17
Extension
Power Supply
Unit
18
Other Extension
Units and
Options
19
Display Module
20
Terminal Block
14.6.4 Error Code List and Action
When a program error occurs in the PLC, the error code is stored in the special data registers D8060 to
D8067, D8438, D8449 and D8489, and the error bit turns ON in the special data register D8166 as follows.
Take action based on the following information.
Error
code
PLC operation at
error occurrence
Contents of error Action
I/O configuration error [M8060(D8060)]
Ex-
ample:
1020
Continues
operation
The head number of unconnected I/O device
• 1st to 3rd digits: Device number
• 4th digit: I/O type
(1 = input (X), 0 = output (Y))
Example: When 1020 is stored in D8060
Inputs X020 and later are unconnected.
Unconnected I/O relay numbers are programmed.
The PLC continues its operation. Modify the
program, check wiring connection, or add the
appropriate unit/block.
Serial communication error 2 [M8438 (D8438)]
0000 ⎯ No error
3801
Continues
operation
Parity, overrun or framing error
• Inverter communication, computer link and
programming:
Ensure the communication parameters are
correctly set according to their applications.
• N:N network, parallel link, etc.:
Check programs according to the applications.
• Remote maintenance:
Ensure modem power is ON and check the
settings of the AT commands.
• Wiring:
Check the communication cables for correct
wiring.
3802 Communication character error
3803 Communication data sum check error
3804 Communication data format error
3805 Command error
3806 Communication time-out detected
3807 Modem initialization error
3808 N:N network parameter error
3809 N:N Network setting error
3812 Parallel link character error
3813 Parallel link sum error
3814 Parallel link format error
3820 Inverter communication error
3830 Memory cassette write error
When the memory cassette is used, check whether
it is mounted correctly.
If the problem persists, something may be
malfunctioning inside the PLC. Consult your local
Mitsubishi Electric representative.
3840 Special adapter connection error Check connection of the special adapter.
PLC hardware error [M8061(D8061)]
0000 ⎯ No error
6101
Stops
operation
Memory access error
When the memory cassette is used, check whether
it is mounted correctly.
If the problem persists or if the memory cassette is
not used, something may be malfunctioning inside
the PLC. Consult your local Mitsubishi Electric
representative.
6102 Operation circuit error
Isolate the PLC and supply power to it using a
different power supply.
If the ERROR LED turns OFF, noise may be
affecting the PLC. Take the following measures.
- Check the ground wiring, and reexamine
the wiring route and installation location.
- Fit a noise filter onto the power supply line.
If the ERROR LED does not turn OFF even after
the above actions are taken, consult your local
Mitsubishi Electric representative.
1 0 2 0
1: Input (X), 0: Output (Y)
Device number: 10 to 337
Example: When X020 is unconnected
BCD conversion value
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