Define Multiple Inputs - Control System

When there is much more than one input to a system, the superposition principle can be employed. This is that:

The response to various inputs simultaneously applied is the sum of the individual responses to each input when applied separately. So, the procedure to be adopted for a multiple input-single output (MISO) system is:

a) Set all but one of the inputs to zero.

b) Determine the output signal due to this one non-zero input.

c) Repeat the above steps for each input in turn.

The total output of the system is the algebraic sum of the outputs because of each of the inputs.