PCL devices losing connection

[AVIF]

HI,

we have about 30 Allan Bradley PLC devices on our network they randomly lose connection for a short period of time.

They're all connected to one port on our Main MS120 switch through a series of unmanaged sub switches.

We can't make any rhyme or see a pattern as to why this is happening.

Maybe anyone has some inside or tips.

Thank you.

[PhilipDAth]

That just means it hasn't seen traffic from those devices for a while.  Perhaps they aren't generating traffic that flows through the MS120.

[Inderdeep]

Is it losing or it is not generating the traffic ? Did you test with some other system to check if you can get the traffic from PLCs. 

[AVIF]

We see it in the PCL device monitoring that they actually lose connection 

[cmr]

Have you tried connecting one directly to the MS120?  The unmanaged switches could not be properly interacting with the MS120.