945
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
38 Error Check Method and Error Code List
38.4 Error Code List and Action
31
FNC275-FNC279
Data
Transfer 3
32
FNC280-FNC289
High Speed
Processing 2
33
FNC290-FNC299
Extension File
Register
34
FNC300-FNC305
FX
3U
-CF-ADP
35
SFC•STL
Programming
36
Interrupt
Function
37
Special Device
38
Error Code
A
Version Up
Information
B
Execution Times
Operation error [M8067(D8067)]
6742
Continues
operation
Variation of measured value exceeds limit.
(UPV < −32768 or +32767 < UPV)
<PID operation is continued.>
The operation is continued with each parameter set
to the maximum and minimum value.
6743
Deviation exceeds limit.
(EV < −32768 or +32767 < EV)
6744
Integral result exceeds limit.
(Outside range from −32768 to +32767)
6745
Derivative value exceeds limit due to derivative
gain (K
D).
6746
Derivative result exceeds limit.
(Outside range from −32768 to +32767)
6747
PID operation result exceeds limit.
(Outside range from −32768 to +32767)
6748
PID output upper limit set value < PID output lower
limit set value.
<Transpose of output upper limit value and output
lower limit value. → PID operation is continued.>
Verify that the target setting contents are correct.
6749
Abnormal PID input variation alarm set value or
output variation alarm set value (Set value < 0)
<Alarm output is not given. → PID operation is
continued.>
Verify that the target setting contents are correct.
6750
<Step response method>
Improper auto tuning result
<Auto tuning is finished. → PID operation is
started.>
• 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.
6751
<Step response method>
Auto tuning operation direction mismatch
<Auto tuning is forcibly finished. → PID operation is
not 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.
6752
<Step response method>
Improper auto tuning operation
<Auto tuning is finished. → PID operation is not
started.>
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.
6753
<Limit cycle method>
Abnormal output set value for auto tuning
[ULV (upper limit) ≤ LLV (lower limit)]
<Auto tuning is forcibly finished. → PID operation is
not started.>
Check whether the target setting contents are
correct.
6754
<Limit cycle method>
Abnormal PV threshold (hysteresis) set value for
auto tuning (SH
PV < 0)
6755
<Limit cycle method>
Abnormal auto tuning transfer status
(Data of device controlling transfer status is
abnormally overwritten.)
<Auto tuning is forcibly finished. → PID operation is
not started.>
Ensure that devices occupied by PID instruction are
not overwritten in the program.
Error
code
PLC operation at
error occurrence
Contents of error Action
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