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1.5.3 Features of the Process CPU
The features specific to the Process CPU are described below.
(1) Addition of 52 process control instructions
Based on the instructions for the High Performance model QCPU, 52 instructions for high-level process control
have been added to the Process CPU.
For details of the added instructions, refer to the following.
QnPHCPU/QnPRHCPU Programming Manual (Process Control Instructions)
(2) Support of the two-degree-of-freedom PID control system
This system allows optimum response independent of set value and disturbance changes.
(3) Auto tuning function (PID constant initial value setting)
This function enables automatic tuning with control parameters, reduction in tuning time, man-hour, and control
engineering, and elimination of gaps caused by manual tuning.
For details of the auto tuning function, refer to the following.
QnPHCPU/QnPRHCPU Programming Manual (Process Control Instructions)
Figure 1.21 Operations of the Process CPU
GX Developer
PX Developer
Ethernet
Process CPU
Process CPU
Tank
Tank
Flow
sensor
Solenoid
valve
Flow
sensor
Valve
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