Mitsubishi Electric MELSEC-F FX3G Series User Manual page 226

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
PLC
Error operation
code at error
occurrence
Operation error [M8067(D8067)]
Variation of measured value exceeds limit.
6742
( PV < -32768 or +32767 <
Deviation exceeds limit.
6743
(EV < -32768 or +32767 < EV)
Integral result exceeds limit.
6744
(Outside range from -32768 to +32767)
6745 Derivative value exceeds limit due to derivative gain (K
Derivative result exceeds limit.
6746
(Outside range from -32768 to +32767)
PID operation result exceeds limit.
6747
(Outside range from -32768 to +32767)
PID output upper limit set value < PID output lower limit set
6748
value.
Abnormal PID input variation alarm set value or output
6749
variation alarm set value (Set value < 0)
<Step response method>
6750
Improper auto tuning result
Continues
<Step response method>
6751
operation
Auto tuning operation direction mismatch
<Step response method>
6752
Improper auto tuning result
<Limit cycle method>
6753
Auto tuning operation direction mismatch
<Limit cycle method>
6754 Abnormal PV threshold (hysteresis) set value for auto tuning
(SH
PV
<Limit cycle method>
Abnormal auto tuning transfer status
6755
(Data of device controlling transfer status is abnormally
overwritten.)
<Limit cycle method>
6756 Abnormal result due to excessive auto tuning measurement
time ( on > , on < 0,
220
Contents of error
PV)
< 0)
< 0)
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.6 Judgment by Error Codes and Representation of Error Codes
<PID operation is continued.>
The operation is continued with each parameter set to the
maximum or minimum value.
).
D
<Transpose of output upper limit value and output lower limit
value. PID operation is continued.>
Check whether the target setting contents are correct.
<Alarm output is not given.
Check whether the target setting contents are correct.
<Auto tuning is finished.
• The deviation at start of auto tuning is 150 or less.
• The deviation at end of auto tuning is 1/3 or more of the
deviation at start of auto tuning.
Check the measured value and target value, and then execute
auto tuning again.
<Auto tuning is forcibly finished.
started.>
The operation direction estimated from the measured value at
the start of auto tuning was different from the actual operation
direction of the output during auto tuning.
Correct the relationship among the target value, output value
for auto tuning, and the measured value, and then execute
auto tuning again.
<Auto tuning is finished.
Because the set value was fluctuated during auto tuning, auto
tuning was not executed correctly.
Set the sampling time to a value larger than the output change
cycle, or set a larger value for the input filter constant.
After changing the setting, execute auto tuning again.
<Auto tuning is forcibly finished.
started.>
Check whether the target setting contents are correct.
<Auto tuning is forcibly finished.
started.>
Ensure that devices occupied by PID instruction are not
overwritten in the program.
<Auto tuning is forcibly finished.
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 (SH
check the result for improvement.
Action
PID operation is continued.>
PID operation is started.>
PID operation is not
PID operation is not started.>
PID operation is not
PID operation is not
PID operation is not
) for auto tuning, and then
PV