Feedforward Control - Omron SYSMAC CS Series Operation Manual

Examples of Applied Control Types
Analog
input
Analog
input
5-2-2

Feedforward Control

Example
194
However, control is as follows when the primary loop MV1 must be switched to
the secondary loop PV2 when the secondary loop is set to Manual.
When the secondary loop is set to Manual, turn the primary loop MV tracking
switch ON and use the secondary loop PV2 to switch the primary loop MV1 to
this PV2. The following shows an example of this.
PV2
022
Advanced PID
<Block Model 012>
PV1
021 006
PV2
MV tracking
083
MV tracking
085
Step Ladder Program
<Block Model 301>
Address 400
A/M
Ladder in Step Ladder Program block
002-086
Secondary Auto/Manual
Before the influence of disturbances such as load fluctuation appears in the
process result, disturbance is detected beforehand to correct MV so that its
influence is canceled. Feedforward control is used in combination with feed-
back control.
Function block used: Lead/Delay (Block Model 147)
Lead/Delay
Disturbance
Block Model 147
Advanced PID
PV
Block Model 012
The output of the Lead/Delay block is added to the MV output of the Advanced
PID block.
Address 001
PV
MV1 PV2
087
SP2
MV tracking
001-085
The MV tracking switch turns OFF when PID2
is set to Auto, and turns ON when PID2 is set
to Manual.
MV tracking switch
MV compensation (ITEM074)
MV
Section 5-2
Advanced PID
<Block Model 012>
Address 002
MV2
006 087 021
021
A/M
086
Analog
output