I have 3 programable logic controllers and other one which isn't part of my solution but I can access usefull data via modbus. I've setup windows service on a remote server to gather data and store it in a SQL Server. But the problem is if the Internet fails? So I'm searching for a hardware data logger solution. I saw a schneider scadapack but I think it doesn't support modbus as client. Everything I'm seeing is hardware with I/O for digital and analog input/outputs but I have already that in PLCs. What I need now is to gather data from the PLCs via modbus RTU/TCP/UDP. After the service detects connection errors it registers the begin date and end date. After it detects PLCs are reachable again it downloads the usefull data that it missed from the hardware data logger solution.
Which solutions support this?
- Yokogawa MW100
- Schneider scadapack models
Both this are data acquisition systems via I/O and probably not via modbus. I'm lost. Help?