Поддержка старых библиотек

using System;
using System.Diagnostics;
using System.Threading.Tasks;
 
namespace BHSALP
{
    class Program
    {
        private static readonly S7PlcService Plc_216 = new();
        private static readonly S7PlcService Plc_217 = new();
 
#if Sim
        private static readonly string plc216_ip = "127.0.0.1";
        private static readonly string plc217_ip = "127.0.0.2";
#else
        private static readonly string plc216_ip = "172.30.64.216";
        private static readonly string plc217_ip = "172.30.64.217";
#endif
 
        static void Main( string[] args )
        {
            PlcAction();
            Console.Read();
        }
        
 
        private static async void PlcAction()
        {
            if ( Plc_216.ConnectionState == ConnectionStates.Offline )
                await Task.Run( () => Plc_216.Connect( plc216_ip ) );
 
            if ( Plc_217.ConnectionState == ConnectionStates.Offline )
                await Task.Run( () => Plc_217.Connect( plc217_ip ) );
 
            Console.WriteLine( $"PLC 216: {Plc_216.ErrorText} | ConnState: {Plc_216.ConnectionState}" );
            Console.WriteLine( $"PLC 217: {Plc_217.ErrorText} | ConnState: {Plc_217.ConnectionState}" );
        }
    }
}