3.3 Selecting PID Control or ON/OFF Control 
3-5 
 
Basic
Operations 
3.3  Selecting PID Control or ON/OFF Control 
 
Two control methods are supported: 2-PID control and ON/OFF control. Switching between 2-PID control 
and ON/OFF control is performed using the control mode switch 1. When this parameter is set to ON, 
2-PID control is selected, and when it is set to OFF, ON/OFF control is selected. The default is OFF 
(ON/OFF control).   
 
● 2-PID Control 
PID control is set by AT (auto-tuning), ST (self-tuning), or manual 
setting. 
For PID control, set the PID constants in the “proportional band” (P), 
“integral time” (I), and “derivative time” (D) parameters.   
 
● ON/OFF Control 
In ON/OFF control, the control output is turned ON when the process 
value is lower than the current set point, and the control output is 
turned OFF when the process value is higher than the current set 
point (reverse operation).