Troubleshooting Connection and Communication Problems

If your specific device is not shown in the list, then WorkBench has not been able to find the device.

Common reasons why your device is not shown in the list include the following:

  • The device is not powered on.
  • One of the network cables between your PC and the device are not connected correctly. You can check if the cable is connected to the device by checking that the link LED on the Ethernet connector is on continuously. If your PC has a link LED, then you should check that this LED is also continuously lit (usually, this LED is next to the RJ45 socket on your PC).
  • A router on the network between your PC and the device is blocking the device discovery messages. Make sure that port 5002 is not blocked by any routers or firewalls. You can enter the IP address of your device directly into WorkBench if a router or firewall is blocking port 5002. Often, firewalls are the cause of a blocked connection.
  • Your PC and the device are on different subnets. Networks, especially those with many devices on them, are split up into multiple subnets. The discovery protocol used to find device will only work if your PC and the device are both on the same subnet .You can enter the IP address of the device directly into WorkBench if this is the case.
  • The network mask defines more than 512 possible addresses. In this case, WorkBench will not ping all of these addresses, so you must unblock discover ports or specify directly the IP address of your device. When an adapter has such a network mask, its background will be shown as yellow to warn that this network will not be discovered with all discover protocols.

Find and Enter IP Address

There are several ways in which you can find a device's IP Address.

  • You can view the device IP address on the device display by pressing the button shown below. The display shows the digits of the IP address in sequence, with dots separating the numbers. You should see four numbers separated by three dots, for example, 192.168.1.5.
  • You can view the device IP address on the display by pressing the B1 button to cycle through menu screens. The settings menu will display the IP address.
  • Using the Device Discovery tool.

You can enter the IP address for the device from the Start Page of WorkBench.

TwinCAT Drive Not Shown

If no TwinCAT device is shown, see Find and Enter AmsNetId