NS-Runtime Time out error while.....

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Hi all. Firstly, I am not a programmer, I just need advice. We have HMI's using NS-Runtime and we keep getting this message. Now, this is why I am contacting you all. This has happened over 20 times on 20 different HMI's which we have replaced over the last 3 years. We have been told by our software supplier that the com port is "on it's way out". There is NO WAY over 20 hmi's over that period will deveop com port faults.
So my question guys, can someone give me a few tips on what to try before I change HMI's over ervery dang mponth please? I am really at the end of my tether here. We connect our HMI's to the Omron PLC's via a standard serial. If we change to another HMI the machine communicates after obviously a long period of downtime. Should we reset the plc?
I will take ANY advise please guys.


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NS-Runtime => Omron?  This is the A-B Forum; have you posted in the Omron forum?

PLC, serial cable, HMI.  What is the range of serial cable length?  What serial cable part number is used (typically a Belden cable)?  Does Omron specify the serial cable details for the HMI or the PLC?  RS-232 or RS-422 communication protocol?

Answering these questions will get you to...we have the hardware installed per the manufacturer's recommendations.

Lastly, consider putting a scope on the serial port wiring to see if poor ground bonding practices are allowing significant ground noise.

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