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14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.6 Judgment by Error Codes and Representation of Error Codes
220
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
Operation error [M8067(D8067)]
6757
Continues
operation
<Limit cycle method>
Auto tuning result exceeds proportional gain. (KP = outside
range from 0 to 32767)
<Auto tuning is finished (KP = 32767). PID operation is
started.>
The variation of the measured value (PV) is small compared
with the output value. Multiply the measured value (PV) by
"10" so that the variation of the measured value will increase
during auto tuning.
6758
<Limit cycle method>
Auto tuning result exceeds integral time.
(TI = outside range from 0 to 32767)
<Auto tuning is finished (KP = 32767). PID operation is
started.>
The auto tuning time is longer than necessary.
Increase the difference (ULV - LLV) between the upper limit
and lower limit of the output value for auto tuning, set a
smaller value to the input filter constant ( ), or set a smaller
value to the PV threshold (SHPV) for auto tuning, and then
check the result for improvement.
6759
<Limit cycle method>
Auto tuning result exceeds derivative time.
(TD = outside range from 0 to 32767)
6760 ABS data read from servo sum check error
Check servo wiring and parameter setting. Also check ABS
instruction.
6762
Port specified by inverter communication instruction is already
used in another communication.
Check to make sure the port is not specified by another
instruction.
6763
Input (X) specified by DSZR or ZRN instruction is already
used in another instruction.
Check to make sure the input (X), as specified by DSZR or
ZRN instruction, is not being used for the following purposes:
- Input interrupt
- High-speed counter C235 to C255
- Pulse catch M8170 to M8175
- SPD instruction
6764
Pulse output number is already used in a positioning
instruction or pulse output instruction (PLSY, PWM, etc.).
Check to make sure the pulse output destination is not being
driven by another positioning instruction.
6765 Number of applied instruction exceeds limit.
The number of times an applied instruction is used in the
program exceeds the specified limit.
6770 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.
6772 EEPROM memory cassette is protected against writing.
The write-protect switch of the EEPROM memory cassette
was set to ON when data was transferred to the EEPROM
memory.
Special block error [M8449(D8449)]
020
*1
Continues
operation
General data sum error
Verify that extension cables are correctly connected.
021
*1
General data message error
022
*1
System access error
025
*1
Access sum error in other station via CC-Link
026
*1
Message error in other station via CC-Link
080
*1
FROM/TO error
This error occurs in the execution of operation.
• Review the program and check the contents of the
operands used in applied instructions.
• Verify that the specified buffer memories exist in the
counterpart equipment.
• Verify that extension cables are correctly connected.
090
*1
Peripheral equipment access error
• Check the cable connection between the programming
panel (PP) / programming device and the PLC.
• Verify that extension cables are correctly connected.
*1. The unit number 0 to 7 of the special function unit/block error is put in .
Error
code
PLC
operation
at error
occurrence
Contents of error Action