Mitsubishi Electric MELSEC-Q/L - Page 752

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7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
Program example in auto tuning (step response method) only
•Device
•Program
Device Description
X2 Start auto tuning.
M0 Start auto tuning.
M1 PID operation
M2 Stop auto tuning.
M14 Auto tuning operation flag
Set the SV. <50°C>
Set the auto tuning output cycle.
<On time: 1.8 seconds>
Set the sampling time (T
S).
<3 seconds>
Turn on the auto tuning execution
bit in action setting (ACT)
parameter.
Set the input filter constant (α).
<70%>
Set the derivative gain (K
D). <0%>
Set the ULV. <On time: 2 seconds>
Set the LLV. <On time: 0 seconds>
Start the auto tuning.
Perform PID action.
Input the PV to the I/O data area
from the A/D converter module.
Initialize PID output.
Execute the PID instruction.
Check the auto tuning action.
End the auto tuning processing.
Complete the auto tuning.
Heater output
Write the manipulated value
to the D/A converter module.
Error