Mitsubishi Electric MELSEC-Q Structured Programming Manual page 264

FXCPU Structured Programming Manual
[Device & Common]
PLC
Error operation
code at error
occurrence
Operation error [M8067(D8067)]
The measured value variation exceeds the limit.
6742
(ΔPV < -32768 or 32767 < ΔPV)
The deviation exceeds the limit.
6743
(EV < -32768 or 32767 < EV)
The integral result exceeds the limit.
6744
(Outside the range from -32768 to 32767)
The derivative value exceeds the limit due to the
6745
derivative gain (K
The derivative result exceeds the limit.
6746
(Outside the range from -32768 to 32767)
The PID operation result exceeds the limit.
6747
(Outside the range from -32768 to 32767)
<Step response method>
6750 Continues
The auto tuning result is improper.
operation
<Step response method>
6751
Auto tuning operation direction mismatch
<Step response method>
6752
The auto tuning operation is improper.
6760 Sum check error in the ABS data sent from the servo Check the connection to the servo and parameter setting.
262
Contents of error
) beyond the limit.
D
5.2 FX1S/FX1N/FX1NC/FX2N/FX2NC PLCs
Action
<The PLC continues PID operation.>
The PLC continues operation with each parameter set to the
maximum or minimum value.
<The PLC finishes auto tuning, and starts PID operation.>
• When auto tuning was finished, the difference between the
measured value at the start of auto tuning and the target value
was 150 or less.
• When auto tuning was finished, the difference between the
measured value at the start of auto tuning and the target value
was 1/3 or more.
Check the measured value and target value, and then execute tuning
again.
<The PLC forcibly finishes auto tuning, and does not start PID
operation.>
The operation direction estimated from the measured value at the
start of auto tuning did not agree with the actual operation direction
caused by the output for auto tuning.
Correct the relationship among the target value, output value for auto
tuning and measured value, and then execute auto tuning again.
<The PLC finishes auto tuning, and does not start PID operation.>
The PLC did not execute auto tuning correctly because the set value
fluctuated during auto tuning.
Set the sampling time to a value sufficiently longer than the output
change cycle, or set the input filter constant to a larger value.
After changing the setting, execute auto tuning again.
5 Errors