Error Code List And Action - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
38.4

Error Code List and Action

When a program error occurs in the PLC, the error code is stored in special data registers D8060 - D8067 and
D8438, D8449. The following actions should be followed for diagnostic errors.
Error PLC operation at
code error occurrence
I/O configuration error [M8060(D8060)]
Ex-
Continues
ample:
operation
1020
Serial communication error 2 [M8438 (D8438)]
⎯
0000
3801
3802
3803
3804
3805
3806
Continues
operation
3807
3808
3812
3813
3814
3820
PLC hardware error [M8061(D8061)]
⎯
0000
6101
6102
6103
6104
6105
Stops
operation
6106
6107
940
Contents of error
The head number of unconnected I/O device
Example: When X020 is unconnected
1 0 2 0 BCD conversion value
Device number
1: Input (X), 0: Output (Y)
• 1st to 3rd digits: Device number
FX :10 to 177
3G
FX /FX :10 to 337
3U 3UC
• 4th digit: I/O type
(1 = input (X), 0 = output (Y))
Example: When 1020 is stored in D8060
Inputs X020 and later are unconnected.
No error
Parity, overrun or framing error
Communication character error
Communication data sum check error
Communication data format error
Command error
Communication time-out detected
Modem initialization error
N:N network parameter error
Parallel link character error
Parallel link sum error
Parallel link format error
Inverter communication error
No error
RAM error
Operation circuit error
I/O bus error (M8069 = ON)
Powered extension unit 24 V failure (M8069 = ON)
Watchdog timer error
I/O table creation error (CPU error)
System configuration error
38 Error Check Method and Error Code List
38.4 Error Code List and Action
Action
Unconnected I/O relay numbers are programmed.
The PLC continues its operation. Modify the
program, check wiring connection, or add the
appropriate unit/block.
• 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 applications.
• Remote maintenance:
Ensure modem power is ON and check the
settings of the AT commands.
• Wiring:
Check the communication cables for correct
wiring.
Confirm for the correct connection of extension
cables.
Confirm user program.
The scan time exceeds the value stored in D8000.
• When turning the power ON to the main unit, a
24V power failure occurs in a powered extension
unit. (The error occurs if the 24V power is not
supplied for 10 seconds or more after main
power turns ON.)
• When turning main power ON, I/O assignment to
CC-Link/LT (built into the FX
PLC) is disabled.
Check the number of connected special function
units/blocks. Some special function units/blocks
have a connection number limit.
-32MT-LT(-2)
3UC