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CHAPTER 1 OVERVIEW
1
1.2 The PID Control System
1.2 The PID Control System
(1) PID control system
The following figure shows a system of when performing the PID control.
(2) PID control procedure
The PID control is performed in the following procedure.
Set value data
storage area
Temperature
process value
data storage area
PID operation
Manipulated
value data storage
area
Temperature
sensor
Control
object
Q64TCN
Set value
(SV)
Temperature
process
value (PV)
Manipulated
value (MV)
Import a signal from the temperature sensor and write it to the temperature
process value data storage area as a temperature process value (PV).
Perform PID operation using the Set value (SV)/temperature process
value (PV) values in the set value/temperature process value data
storage area.
Convert manipulated value (MV) obtained by the PID operation to
transistor-output on time and output it.
Read the temperature
process value (PV)
Perform PID operation
Output the manipulated
value (MV)