FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
258
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.6 Judgment by Error Codes and Representation of Error Codes
Operation error [M8067(D8067)]
6708
Continues
operation
FROM/TO instruction error
This error occurs in the execution of the operation.
• Review the program, or check the contents of
the operands used in the applied instructions.
• Check whether the specified buffer memories
exist in the equipment.
• Check whether the extension cables are
correctly connected.
6709 Other (e.g. improper branching)
This error occurs in the execution of operation.
Review the program, or check the contents of the
operands used in the applied instructions.
Even if the syntax or circuit design is correct, an
operation error may still occur.
For example:
"T200Z" itself is not an error. But if Z had a value of
400, the timer T600 would attempt to be accessed.
This would cause an operation error since there is
no T600 device available.
6710 Mismatch among parameters
This error occurs when the same device is used
within the source and destination in a shift
instruction, etc.
6730 Incorrect sampling time (T
S) (TS ≤ 0)
<PID instruction is stopped.>
This error occurs in the parameter setting value or
operation data executing PID instruction.
Check the contents of the parameters.
6732
Incompatible input filter constant (α)
(α < 0 or 100 ≤ α)
6733 Incompatible proportional gain (K
P) (KP < 0)
6734 Incompatible integral time (T
I) (TI < 0)
6735
Incompatible derivative gain (K
D)
(K
D < 0 or 201 ≤ KD)
6736 Incompatible derivative time (T
D) (TD < 0)
6740 Sampling time (T
S) ≤ Scan time
<Auto tuning is continued.>
The operation is continued in the condition
"sampling time (T
S) = cyclic time (scan time)".
6742
Variation of measured value exceeds limit.
(PV < −32768 or +32767 < PV)
<PID operation is continued.>
The operation is continued with each parameter set
to the maximum or 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.>
Check whether 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.>
Check whether the target setting contents are
correct.
Error codes in shaded columns are added in FX
3U PLCs.
Error
code
PLC operation at
error occurrence
Contents of error Action
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