Omron E5AN User Manual page 224

Adjustment Level
p
Proportional Band
i
Integral Time
d
Derivative Time
Function
Parameter
name
Proportional
Setting
Band
Integral Time
Derivative Time
Note
See
See
188
These parameters set PID control constants. PID constants are automatically
set when AT or ST is executed.
P action: Refers to control in which the MV is proportional to the deviation
(control error).
I action: Refers to a control action that is proportional to the time integral of
the deviation. With proportional control, there is normally an offset
(control error). Proportional action is thus used in combination with
integral action. As time passes, this control error disappears, and
the control temperature (process value) comes to agree with the set
point.
D action: Refers to a control action that is proportional to the time derivative of
the control error. The proportional control and integral control cor-
rect for errors in the control result, and thus the control system is
late in responding to sudden changes in temperature. The derivative
action increases the MV in proportion to the slope of the change in
the temperature as a corrective action.
Models
Controllers with Thermocouple/
Resistance Thermometer Multi-
inputs
Controllers with Analog Inputs
(1) Set "None" as the unit for Controllers with Analog Inputs.
(2) If the settings for RT (robust tuning) are changed, the proportional band
(P), integral time (I), and derivative time (D) will be initiated.
■ Related Parameters
AT execute/cancel (adjustment level): Page 179
The control must be set to 2-PID
control.
Setting range
0.1 to 999.9
0 to 3999
RT is OFF. 0 to 3999
RT is ON. 0.0 to 999.9 Second
Section 5-4
Unit Default
C or F 8.0
(See note
1.)
%FS 10.0
Second 233
Second 40
40.0