
Section 8 Operation Examples
Single Loop Automatic Operation with Feedforward
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Single Loop Automatic Operation with Feedforward
Feedforward control is a strategy used to compensate for disturbances in a system
before they affect the controlled process variable. A feedforward control system
measures a disturbance variable, predicts its effect on the process, and applies
corrective action to cancel the effect of the disturbance. A block diagram of
feedforward control type of system is shown in
Feedforward control system provides a combination of feedforward and feedback
control. Feedback provides its normal function of holding the process at the
setpoint. Feedforward helps the feedback function by modifying the control output
as required to cancel the effect of variations in the disturbance variable. The
feedforward input (set up as a percent of output) is multiplied by a constant (gain),
and a bias value (%) is added to or subtracted from the signal. The gain and bias
values are tunable. The feedforward function can be configured to either add the
signal to the control output or multiply the output by the signal.
Figure 84. Block Diagram of feedforward control system
Summary of Contents for Ability 800xA Series
Page 1: ...Power and productivity for a better worldTM 800xA for MOD 300 Operation System Version 6 0 ...
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Page 3: ...800xA for MOD 300 Operation System Version 6 0 ...
Page 14: ...Table of Contents 14 3BUR002418 600 A ...
Page 74: ...Area Graphic Display Section 3 CCF Displays 74 3BUR002418 600 A ...
Page 102: ...Batch Connectivity to M0D 300 Section 4 TCL Displays 102 3BUR002418 600 A ...
Page 120: ...TLL Messages Section 5 TLL Displays 120 3BUR002418 600 A ...
Page 212: ...Viewing Abnormal State on MOD Loop Displays Section 8 Operation Examples 212 3BUR002418 600 A ...
Page 320: ...BRKPTS Appendix A Runtime Templates 320 3BUR002418 600 A ...
Page 322: ...Updates in Revision Index A 322 3BUR002418 600 A ...
Page 330: ...Index 330 3BUR002418 600 A ...
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