946
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
38 Error Check Method and Error Code List
38.4 Error Code List and Action
Operation error [M8067(D8067)]
6756
Continues
operation
<Limit cycle method>
Abnormal result due to excessive auto tuning
measurement time (
τ
on >
τ
,
τ
on < 0,
τ
< 0)
<Auto tuning is forcibly finished.
→
PID operation is
not 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 (
α
), or set a smaller value to the PV
threshold (SH
PV
) for auto tuning, and then check
the result for improvement.
6757
<Limit cycle method>
Auto tuning result exceeds proportional gain. (KP=
outside range from 0 to 32767)
<Auto tuning is finished (K
P
= 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.
(T
I
= outside range from 0 to 32767)
<Auto tuning is finished (K
P
= 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 (
α
), or set a smaller value to the PV
threshold (SH
PV
) for auto tuning, and then check
the result for improvement.
6759
<Limit cycle method>
Auto tuning result exceeds derivative time.
(T
D
= outside range from 0 to 32767)
6760
ABS data read from servo sum check error
Check servo wiring and parameter setting. Also
check the 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
1) Input (X) specified by DSZR, DVIT or ZRN
instruction is already used in another
instruction.
2) The interrupt signal device for DVIT instruction
is outside the allowable setting range.
1) Check to make sure the input (X), as specified
by DSZR, DVIT or ZRN instruction, is not being
used for the following purposes:
- Input interrupt (including the delay function)
- High speed counter C235 to C255
- Pulse catch M8170 to M8177
- SPD instruction
2) Check the contents of D8336 for the correct
interrupt signal specification for DVIT
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.
Check whether the number of times that applied
instructions are used in the program does not
exceed the specified limit.
6770
• FX
3U
/FX
3UC
Series PLC
Writing error to flash memory cassette.
• FX
3G
Series PLC
EEPROM access error.
6771
Memory cassette is not connected.
Check for the correct attachment of the memory
cassette.
6772
Memory cassette is protected against writing.
The write-protect switch of the memory cassette
was set to ON when data was transferred
to the flash memory. Set the protect switch to OFF.
6773
Access error to memory cassette during writing in
RUN mode
While data was written in the RUN mode, data was
transferred to (read from or written to) the memory
cassette.
Error
code
PLC operation at
error occurrence
Contents of error
Action
