Mitsubishi Electric MELSEC FX3U Programming Manual page 948

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Error PLC operation at
code error occurrence
Operation error [M8067(D8067)]
6756
6757
6758
6759
6760
6762
Continues
operation
6763
6764
6765
6770
6771
6772
6773
946
Contents of error
<Limit cycle method>
Abnormal result due to excessive auto tuning
measurement time (τon > τ, τon < 0, τ < 0)
<Limit cycle method>
Auto tuning result exceeds proportional gain. (KP=
outside range from 0 to 32767)
<Limit cycle method>
Auto tuning result exceeds integral time.
(T = outside range from 0 to 32767)
I
<Limit cycle method>
Auto tuning result exceeds derivative time.
(T = outside range from 0 to 32767)
D
ABS data read from servo sum check error
Port specified by inverter communication
instruction is already used in another
communication.
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.
Pulse output number is already used in a
positioning instruction or pulse output instruction
(PLSY, PWM, etc.).
Number of applied instruction exceeds limit.
• FX /FX Series PLC
3U 3UC
Writing error to flash memory cassette.
• FX Series PLC
3G
EEPROM access error.
Memory cassette is not connected.
Memory cassette is protected against writing.
Access error to memory cassette during writing in
RUN mode
38 Error Check Method and Error Code List
38.4 Error Code List and Action
Action
<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 ) for auto tuning, and then check
PV
the result for improvement.
<Auto tuning is finished (K
P
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.
<Auto tuning is finished (K
P
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 ) for auto tuning, and then check
PV
the result for improvement.
Check servo wiring and parameter setting. Also
check the ABS instruction.
Check to make sure the port is not specified by
another instruction.
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.
Check to make sure the pulse output destination is
not being driven by another positioning instruction.
Check whether the number of times that applied
instructions are used in the program does not
exceed the specified limit.
Check for the correct attachment of the memory
cassette.
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.
While data was written in the RUN mode, data was
transferred to (read from or written to) the memory
cassette.
= 32767). → PID
= 32767). → PID