Change the Unit Name property of the Signal Input object to define the units used by the co-simulation inputs. The Unit and ID properties cannot be edited.

Co-Simulation inputs also require a Function Expression that includes the SINPUT expression and that includes Signal Input in its Argument List as illustrated below:

You may define as many Signal Input objects as you need to support the co-simulation. Once you have defined the objects, list them in the Co-Simulator object.