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Showing results for tags '20256'.
Hello, I am having an issue with intermittant connection to a remote PLC. The setup is as follows: Server has a VPN connection to a GSM router on site. This is connected via ethernet to the PLC. What I have found: I lose the ability to do a socket ping to the PLC on 20256. When I lose this ability, I also lose the ability to pull telemetry data off the PLC from the registers. (makes sense, they use the same port). I am doing this ping test from the local router on site, over the VPN. The issue is therefore not with the VPN itself, but the connection between the router
Hello, I have a project that has reliability issues that seem to stem from the PLC losing connection to its router on socket 20256. On a PLC where the connection is lost: If I ask the router to do a standard ping against the router, it succeeds. If I ask the router to do a TCP socket ping with 20256, it fails. (on a PLC I am successfully getting data from, this succeeds) The kludgy way I am temporarily getting round this, is the router is set to do a hard reset every 4 hours which reinitialises everything Bit of background: Remote server using unicomdriv.dll is communicating