DLRX/WX

[mhw]

I am using the internal Ethernet port on a H2DM1E to communicate with four H0-ECOM100s in four DL06 bases. I am doing two DLRX and one DLWX to each 06. There is one Cat 5E cable that goes from the local switch to a switch located in the cabinet with device 1. Then there is a cable that goes another 100' to device 4. Sporadically device 1 will stop communicating for one second to thirty seconds. I have swapped the ECOMs and PLC from device 1 with device 4. Sometimes it will go for weeks at a time without dropping. Other times it will drop several times a day. Nothing is consistent about when it will do it. There is never a problem with the other three devices. The DLRX/DLWX logic is the same for each device.
Any advice on what to try next?

[Controls Guy]

The branch cable from device 1 to its switch.

The switch itself.  I've seen individual ports on switches go bad, see no reason one couldn't be intermittent.

[ATU]

Have you tried shielded M12 industrial Ethernet cables? AD sells them now.  It could be a connector issue too. Vibration, heat may also affect the switch if not rated properly. Consumer switches have less tolerance for those conditions if you use those types.

[ADC Product Engineer]

The branch cable from device 1 to its switch.

The switch itself.  I've seen individual ports on switches go bad, see no reason one couldn't be intermittent.

Oh yeah.  Had that happen more than once.  The switch in my house had a whole bank go intermittent.  Took me weeks to figure it out.  Turned out that my son had fried the Ethernet port on his computer and not said anything.

One of the other big things that I I have seen is the power to the switch not being clean enough.  That one is really rare, but it is a possibility.

[mhw]

The branch cable from device 1 to its switch. The switch itself.  I've seen individual ports on switches go bad, see no reason one couldn't be intermittent.

I have swapped ports on the switch, but I can't remember if I have changed the 1M patch cable. The next time I am there I will make sure that I change it.

Have you tried shielded M12 industrial Ethernet cables? AD sells them now.  It could be a connector issue too. Vibration, heat may also affect the switch if not rated properly. Consumer switches have less tolerance for those conditions if you use those types.

No I have not since the down stream device never has a problem. I have ran a temporary cable from device 2 to device 1. So Device 1,2,3,&4 are all using the same trunk line with only device 1 having a problem.