Can't Connect to a Mitsubishi FX3GE

Ignition
1

Hi everyone,

I’m having trouble reconnecting to a Mitsubishi FX3GE PLC. The connection status is stuck at ReconnectWait (see screenshot), and I can’t seem to get it back online.

A bit of background:

  • This setup was working a couple of months ago and ran fine for about a week.

  • During that time, data was successfully logged to the database.

  • Since then, the connection stopped working without any changes to the setup (no config changes, network changes, or updates).

What I’m seeing now:

  • All tags show Bad quality.

  • Deleting and recreating tags didn’t help.

  • I’ve tried adding a new TCP port configuration.

  • Restarted the PLC and the system.

  • Still stuck in ReconnectWait with no data coming through.

Additional info:

  • Communication does work in System2000, where I can still see live tag values.

  • There is no SLMP option available in the driver settings (as shown in the screenshot).

At this point I’m not sure if it’s a driver issue, communication setting, or something else entirely.

Has anyone experienced something similar or knows what might cause this? Any suggestions would be appreciated.

Thanks in advance!

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2

ReconnectWait simply means that the connection is rejected every time Ignition actually tries to connect. If it never shows "Connecting..." that typically means each attempt is affirmatively rejected--usually by a firewall.

You should run wireshark on your gateway with a capture filter of your target IP address. This will show you exactly what is happening, and you can get your IT involved.

3

Hi,

Thank you for replay,

on powershell in gateway I can ping the PLC using Test-NetConnection and on the port 1287, I get TcpTestSucceded: True

IT looked into it and can't see anything wrong from their side, we do have other PLC's connected and work fine,

Also this worked for a week in same gateway and nothing has changed since!