I have a Installation of Scada Server on a Ubuntu Linux. I’am Reading Datapoints over Modbus TCP/IP connection. This works properly. After a few day i’am loosing some Datapoints. When i restart the Scada Server then works the system properly for a few new days.
Sometime the received data are incorrect. You can check it by http://modbus.rapidscada.net/ or any other Modbus parser. I recommend to try increasing a delay after request in Communicator (Request Sequence tab). Probably the polling speed is too fast for the particular device and network.