Mitsubishi Electric MELSEC-Q/L - Page 734

732
7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
Program example
• For the program examples of the PID instruction, see Page 747 Example of practical program (step response method).
9121 Auto tuning by the limit cycle method resulted in an error by exceeding the
auto tuning measurement time as follows.
• 
on
>, 
on
<0, <0

9122 Auto tuning by the limit cycle method went out of the range of proportional
gain (K
P
=0 to 32767) as the result of auto tuning as follows.
• The change in the process values (PV) is small with regard to the output
values.

9123 Auto tuning by the limit cycle method went out of the range of the integral
time (T
I
=0 to 32767) as the result of auto tuning as follows.
• More time than necessary is taken for auto tuning.

9124 Auto tuning by the limit cycle method went out of the range of the derivative
time (T
D
=0 to 32767) as the result of auto tuning as follows.
• More time than necessary is taken for auto tuning.

Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU