Chapter 1 General Description - Mitsubishi Electric MELSEC-Q series Programming Manual

1
GENERAL DESCRIPTION
This manual describes the sequence program instructions used to implement PID control with any of the following CPU
modules.
• Basic model QCPU (first five digits of serial No. are 04122 or later)
• High Performance model QCPU
• Redundant CPU
• Universal model QCPU
• LCPU
• QnACPU
For the Basic model QCPU, High Performance model QCPU, Redundant CPU, Universal model QCPU, and LCPU, the
instructions for PID control by using complete and incomplete derivatives are featured as standard.
The QnACPU has the instructions used to perform PID control by complete derivative (PID control instructions) as standard
features.
Since the incomplete derivative PID control instructions and complete derivative PID control instructions are independent of
each other, they can be executed at the same time.
The following table indicates the CPU modules that can use the incomplete derivative PID control instructions and complete
derivative PID control instructions.
: Usable, : Unusable
CPU Module Model Name
Basic model QCPU
High Performance model QCPU
Redundant CPU
Universal model QCPU
LCPU
QnACPU
*1 Version 7 or earlier version of GX Developer issues an "instruction code alarm" if it loads a new CPU instruction realized with GX
Developer Version 8.
There are the following PID control instructions.
Classification
PID control data setting
PID operation
PID control status monitor
Specified loop No. operation stop
Specified loop No. operation start
Specified loop No. parameter change
PID control via PID control instructions is implemented by combining the CPU module with the A/D converter module and D/A
converter module.
In the case of the QnACPU, the PID control status can be monitored using the AD57(S1) CRT controller module.
• The Process CPU is not compatible with the PID control instructions described in this manual. To implement
PID control using the Process CPU, use the process control instructions described in the MELSEC-Q
Programming/Structured Programming Manual (Process Control Instructions).
• The Redundant CPU and Universal model Process CPU can use the PID control instructions and process
control instructions.
1 GENERAL DESCRIPTION
10
First five digits of serial No. are "04121" or earlier
First five digits of serial No. are "04122" or later
First five digits of serial No. are "05031" or earlier
First five digits of serial No. are "05032" or later
Incomplete Derivative Complete Derivative
 
 
 
 
 
 
 
 
Incomplete Derivative Complete Derivative
S(P).PIDINIT PIDINIT(P)
S(P).PIDCONT PIDCONT(P)

PID57(P)
S(P).PIDSTOP PIDSTOP(P)
S(P).PIDRUN PIDRUN(P)
S(P).PIDPRMW PIDPRMW(P)
*1