Have you ever seen a play? Dozens of actors all coming together to create the illusion of a scene, all based on a script pre-written and rehearsed time and time again.
Devices like Electrical Drive Systems and Programmable Logic Controllers (PLCs) are able to provide real time data interfaces for 3rd party clients. Excel can often be that client. Getting real time data into Excel allows the use of the powerful analysis features of Excel to be used in real time.