The Equalis Data Acquisition and Control Systems (DACS) module  allows a user to define a mathematical model of a typical control system in the form of a block diagram. From this model you can view critical charts and important characteristics of that system such as step response, Bode, Nyquist Nichols, Pole-Zero, and Singular values plots.
In this example we use our Control and Power Systems module from DACS to analyze a linear model of a permanent magnet DC motor. This motor can be modeled as shown below.
Assuming a constant load, we can consider a DC motor as a SISO sysem, where the applied voltage Va is the input and the motor speed is the output. Using standard mathematical operations (such as summation, gain, integration), let us create a diagram of this SISO system.
The resulting diagram is shown below: