You can also start playmaker global events from Ork. Using the node "Send Message", Set the function name to SendEvent , click add parameter, set it to string and type in the global event you wish to call. For the target object, you can use a pre defined prefab or just search for the object with your desired playmaker component. You can also use the "Call Function" node, just be sure to use PlayMakerFSM as the component name.
If your interested in setting and getting Ork global varablies, I made a set of actions sometime ago that will do so. They still work as I'm using them in my project.
You can get them here