850
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Error Check Method and Error Code List
37.4 Error Code List and Action
37.4
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. The following actions should be followed for diagnostic errors.
Error codes in shaded columns are added in FX
3U
and FX
3UC
PLCs.
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. The PLC continues
operation regardless.
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 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
3812
Parallel link character error
3813
Parallel link sum error
3814
Parallel link format error
3820
Inverter communication error
PLC hardware error [M8061(D8061)]
0000
⎯
No error
6101
Stops
operation
RAM error
6102
Operation circuit error
6103
I/O bus error (M8069 = ON)
Check for the correct connection of extension
cables.
6104
Powered extension unit 24 V failure (M8069 = ON)
6105
Watchdog timer error
Check user program.
The scan time exceeds the value stored in D8000.
6106
I/O table creation error (CPU error)
•
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 turn ON.)
•
When turning main power ON, I/O assignment to
CC-Link/LT (built-in on the FX3UC PLC) was
disabled.
6107
System configuration error
Check the number of the connected special function
units/blocks. A few special function units/blocks are
limited the number to connect.
1 0 2 0
1: Input (X), 0: Output (Y)
Device number: 10 to 337
Example: When X020 is unconnected
BCD conversion value