Before Performing A Control; Pid Control; On/Off Control - TOHO TTM-i4N User Manual

8. Before Performing a Control

･ This product uses nonvolatile memory to memorize settings. It retains its settings even if its power is turned OFF.
･ This product can switch the input type of the sensor. Upon using the product, please match the type of the sensor with the
sensor setting of the product.
･ This product can perform two types of control: PID and ON/OFF.
The characteristics of each control are described below. Choose the control to use based on their characteristics.

PID Control

Pros: Can achieve better control result than ON/OFF control.
Cons: Life of a relay contact point gets shorter because of the frequent ON and OFF of the output.

ON/OFF Control

Pros: Life of a relay contact point is generally longer since it turns ON if the temperature is lower than the setting value and OFF
if higher.
Cons: Less controllability than PID control.
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