Omron SYSMAC CV Series User Manual

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The strength of the derivative action is indicated by the derivative time, which is
the time required for the manipulated variable of the derivative action to reach
the same level as the manipulated variable of the proportional action with re-
spect to the step deviation, as shown in the following illustration. The longer the
derivative time, the stronger the correction by the derivative action will be.
Derivative Action
PD Action and Derivative Time
Step response
PD action
P action
Td: Derivative time
D action
0
0
0
0
Ramp response
Deviation
Manipulated
variable
Deviation
Manipulated
variable
PID Action
PID action combines proportional action (P), integral action (I), and derivative
action (D). It produces superior control results even for control objects with dead
time. It employs proportional action to provide smooth control without hunting,
integral action to automatically correct any offset, and derivative action to speed
up the response to disturbances.
Step Response of PID Control Action Output
Ramp Response of PID Control Action Output
PID action
I action
P action
D action
Step response
0
0
Deviation
Manipulated
variable
PID action
I action
P action
D action
Ramp response
0
0
Deviation
Manipulated
variable
Direction of Action When using PID action, select either of the following two control directions. In
either direction, the MV increases as the difference between the SV and the PV
increases.
PID and Related Instructions Section 5-24

Omron SYSMAC CV Series Specifications

General

Brand	Omron
Model	SYSMAC CV Series
Category	Controller
Language	English