Is each driver instance communicating with a separate PLC? If so, try this:
- Start with a new blank project
- Add a driver instance for each PLC
- Add a BasicLabel for each driver instance (using ComComponent property)
- Set PLCAddressValue to a valid tag in each PLC
- Start the application
After started, disconnect the Ethernet cable to force a ComError on all driver instance and see if the BasicLabels all show an error in about 5 seconds