Powershell invoke Command Variablen übergeben

function Get-ServiceRunning {
	[CmdletBinding()]
	[OutputType([System.Int32])]
	param(
		[Parameter(Position=0, Mandatory=$true)]
		[ValidateNotNullOrEmpty()]
		[System.String]
		$Computer_Name,

		[Parameter(Position=1)]
		[ValidateNotNullOrEmpty()]
		[System.String]
		$ServiceName
	)
	try {
                $wert = "0"	  
   
		$result = Invoke-Command -ComputerName $Computer_Name -ScriptBlock { Get-Service -DisplayName "$using:ServiceName" }  
		
		if($($result).Status -eq "stopped"){$wert='0'}  
		if($($result).Status -eq "running"){$wert='1'}  

	}
	catch {
		throw
		$wert = "-1"  
	}
	return $wert
}

Get-ServiceRunning("ServerA","ServiceA")