On a remote workstation, select the Control Network.
If multiple workstations, trying to communicate to the same controller, are reporting communication problems and the controller itself is not reporting a communication problem, the problem might be communication message timeouts due to very heavy controller loading. To troubleshoot this situation, select the Communications subsystem under one of the workstations, right-click, and then select Display Comm Connection List. In the Communication Connection List dialog, select the controller, click Node Details, and then check the communication details between the workstation and the controller. If the SyncsSent and AckTOut values between the two nodes is high, decrease the controller loading.
For a description of a communication value such as Connection To, or a diagnostic parameter such as State, click the value or parameter name.
For help on the communication values, click the column headings (Primary, Detail, and Secondary).