Fixed-Point Blockset

Simulation 4: Individual Override

The previous simulation optimized results for the fixed-point digital controller. In this simulation, the A2D block is configured so that it feeds the digital controller with doubles. This represents overriding the A/D hardware constraints, and is accomplished by checking the Override with doubles check box as shown below as shown below.

Note    You can display the A2D dialog box, by double-clicking on the A2D entry in the interface.

The procedure and results for this simulation are shown below.

A close-up of the plant output signal is shown below. The limit cycle is no longer present in the steady state - confirmation of a poor A/D design. This means you should replace the hardware, amplify the signal, or do some digital processing to better condition the signal.

Simulation 3: Automatic Scaling

Building Systems and Filters