I see. I think there’s a misunderstanding. The PowerShell plugin in Royal TS is designed to execute a predefined script and display the result. It’s not an interactive console.
If you need an interactive console you can try to embed the PowerShell console in Royal TS using the External Application connection type:
https://blog.royalapplications.com/2013/09/27/integrate-powershell-in-royal-ts/
Let me know if this helps.