Plant Simulation offers more than one interface for control. Depending on your task and skills you can use i.e. HTML, COM, C-Interface or ActiveX. Find more info in the documentation in the "Add-Ins Reference Help" chapter.
On the start page of Plant Simulation, open "Example Models - Small Examples". Choose "Information flow". In the "Topic" you can find examples for many of the interfaces.
I am also concerned to use API to connect PlantSim.
I have tried to open and run the example models, .... the system tells me that I need a interface license.
We have the professional and the run time licenses, do we need to buy it to be able to connect our model to the external 'world' ?