User`s manual

11-8 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual

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January 2001 GFK-1742A

Gain Scheduler Program Example

The following example illustrates a method to use local logic to implement a simple gain-

scheduling algorithm. Care should be taken whenever one implements an algorithm that

dynamically changes the control characteristics. In many situations, dynamically changing the

control characteristics can cause the controlled process to go unstable. Note that the

Velocity_Loop_Gain

control variable may be written multiple times in the same sweep in the

following program. However, the final value written in a given sweep is the active value since

variables are updated at the conclusion of Local Logic execution. Refer to Chapters 12 and 13 for a

detailed description of the Local Logic control variables and outputs.