We've just installed the Modbus Ethernet interface and have created a test tag. It seems to be working, except once in a while it gets a 'Comm Fail' status come through.
|13-Sep-17 11:22:55||Comm Fail|
|13-Sep-17 11:46:57||Comm Fail|
Looking at the Device Status health point, the status has remained as 'Good' both times the 'Comm Fail' occurred.
How is 'Comm Fail' different than I/O Timeout? Definitions I've found for both essentially say that the interface couldn't communicate with the device. However, the Modbus Ethernet user manual only addresses what can cause and how to reduce I/O Timeouts.