John it has been long enough I have forgotten what the hell I did for accel. and velocity. At my age if you don't think of something every little bit it seems to fly off into the wild blue and you have to start all over. I do know it is in Mach but where eludes me.
The power source for my solenoids comes from the relays on my table I/O card. I'm sure you have the same card but I think it might be in the gray box on your system. I have both solenoids hooked to one of the relays that are controlled thru Sheetcam post's that put the Gcode to control them into the program. I put the scribed parts or areas on a seperate layer and use the scriber post for that layer. You can drag and drop the layers in Sheetcam to control whether you scribe before of after the plasma (I scribe before cutting). TIP: John when you start looking for solenoids get three way high pressure ones that will handle full air line pressure.
I saw on Toms forum where you got help - he is awesome isn't he. Sometimes after talking to him I have to wonder "what did he just tell me???" since he knows it so well he can talk to you like you are an electrical engineer also.
You are at the point now John where you can start to have fun with it!