CX1020(beckhoff PLC) connecting problem

Hello,


I have a problem, when i want to connect to the beckhoff PLC ( CX1020 ).


My problem:

I'm using a crass cable and i bring the IP address of the beckhoff PLC in range of the IP address of the PG/PC. but when i connect the cable from the PG/PC to the beckhoff PLC, and i use of TwinCAT ( V2 ), when i'm clicking on the Broadcast Search in the Add Route Dialog, i can't find any devices (beckhoff PLC)to connect.


My question:

What's the wrong?

Please help me.
Thanks