Mitsubishi Electric MELSEC-Q/L - PID Instruction; Overview

7 APPLICATION INSTRUCTIONS
7.18 PID Instruction
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7.18 PID Instruction
Overview
Types of PID instructions
The following types of PID instructions are available.
PID operation instruction
To come close to the set value (SV), the PID operation instruction calculates the manipulated value (MV) from the process
value (PV) by combining the P operation (proportional operation), I operation (integral operation), and D operation (derivative
operation).
■Alarm output function
This function can turn ON the alarm output according to the rates of change of input (process value) and output (value).
■Settings of upper and lower limits of output value
This function can set the upper and lower limit values of output.
■Auto tuning function
Proportional gain (K
P
), integral time (T
I
), and derivative time (T
D
) can be set automatically. The limit cycle method or step
response method can be selected.
■Operation method of PID operation instruction
PID velocity type/process value derivative type operations are performed.
Type Compatible model Reference
Process control instruction • QnPHCPU
• QnPRHCPU
MELSEC-Q Programming/Structured Programming Manual (Process Control
Instructions)
PID control instruction • QnACPU
•QnCPU
• QnHCPU
• QnPRHCPU
• QnUCPU
• QnUDVCPU
•LCPU
MELSEC-Q/L/QnA Programming Manual (PID Control Instructions)
PID operation instruction • QnUDVCPU
•LCPU
Page 729 PID control
Programmable controller
PID instruction
Control target
Process value (PV)
Manipulated value (MV)
Set value (SV)