PID lower limit
PID action set point
PID differential time
Basic configuration of PID control
Pr.128 = "20 or 21" (measured value input)
PID action outline
PI action is a combination of proportional action (P) and integral action (I), and applies a manipulated amount according to the
size of the deviation and transition or changes over time.
[Example of action when the measured value changes in a stepped manner]
(Note) PI action is the result of P and I actions being added together.
PD action is a combination of proportional action (P) and differential action (D), and applies a manipulated amount according
to the speed of the deviation to improve excessive characteristics.
[Example of action when the measured value changes proportionately]
(Note) PD action is the result of P and D actions being added together.
0 to 100%
0 to 100%
0.01 to 10 s
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Set the lower limit. The FDN signal is output when the measured
value falls below the setting range. The maximum input (20 mA/5 V/
10 V) of the measured value is equivalent to 100%.
Set the set point during PID control.
Set point set by Pr.128.
With deviation ramp input, this is the time (Td) used for obtaining the
manipulated amount only by proportional action (P). Response to
changes in deviation increase greatly as the differential time
The differential control is disabled.
5.10 (A) Application parameters