Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual page 765

Precautions
• When auto tuning is not used, twenty-five devices are occupied from the head device specified in (s3).
• When auto tuning (limit cycle method) is used, twenty-nine devices are occupied from the head device specified in (s3).
• When auto tuning (step response method) is used, the number of devices occupied from the devices specified in (s3)
differs depending on the ON/OFF status of b8 of (s3)+1.
Operation of b8 Occupied device points
ON Twenty-eight devices are occupied from the device specified in (s3).
OFF Twenty-five devices are occupied from the device specified in (s3).
• Two or more PID instructions can be executed at the same time. (There is no limitation in the number of loops.) However,
make sure that (s3), (d) and other operands specified in each instruction are different to each other.
• For the output value (MV) in the PID instruction, specify an unlatched data register. If specifying a latched data register,
make sure to clear the backup contents when the PLC mode is set to RUN using the following program.
SM402
RST
Initial pulse
(1): Latched data register number specified to (d)
D***
(1)
11 PID CONTROL INSTRUCTION
11.1 PID Control Loop
11
763