# Troubleshooting

Follow these steps to debug problems:

1. Verify the interface and link status.
   1. Launch the Comm Card Configurator and verify that both the Interface Status and Link Status indicators say Up.
   2. From a PC that is on the same network as your vision system, open a command window and issue a ping command with the network address specified in the IP Address field.

   If the ping command does not receive a reply, verify the physical network connection and verify that the network settings are correct for your network.

2. Verify the NDM is configured for the correct protocol. When you connect to the Comm Card in Designer, verify that you have selected the correct protocol.

Note: Signals from the PLC resulting in an error, such as a job load error or an acquisition error will still result in changing the discrete output value (if the signal is mapped to a discrete output).