Data simulation task is used to modify the current values of the points that are configured for simulation. Data simulation supports a number of simulation patterns that can be configured for each point.
Simulation is quite helpful for testing a wide range of configuration functions such as mapping, alarming, data logging, automation logic, and system performance.

Yes. Analog points can be configured to follow a sine or a saw-tooth or a square wave.

Yes, however, you can also use the Automaton Engine to build custom logic to mimic your process behaviour and can better simulate the cause and effect logic better.
Our Process Control Sample projects are using automation logic to emulate their processes.