Host Engineering Forum
General Category => Do-more CPUs and Do-more Designer Software => Topic started by: cc101 on August 25, 2026, 06:05:55 PM
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I am attempting to have a BRX read in UDP Packets from a POM Ethernet Port using PacketIN. I have swapped the PLC and factory reset it along with trying different POM's (both EX and LT). The Internal ethernet and the POM ethernet are on separate subnets and the UDP packets (port 50222) can only be seen on the subnet attached to the POM. The device sending the packets is broadcasting them the local subnet which is the one attached to the POM. I am completely stumped since the POM should have the capability to bridge subnets. Any suggestions for fixes would be appreciated!
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What you're trying to do should work. I have a BRX CPU's internal port with a PACKEOUT sending to a second BRX CPU with an ECOMEX using a PACKETIN to send SL10.
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It's good to know that this definitely should be working. The confusing part of mine is that I can see the traffic on the network and confirmed that the ethernet connected to the POM has access but the UDP device cannot see any packets from that port.
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UDP device config? IP config for both ports?
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My setup had the BRX Eth. port directly connected to the POM Eth. port with a Cat6 cable. Do you have a switch or some other network device between them that could be blocking the broadcast traffic ?
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The IP is configured for both ports and UDP is correctly configured for the BRX device (deleted and remade several times to make sure). Both ports on are on a network switch but I unplugged the POM and read the UDP packets from the cable (put my computer in place of POM). All devices also have correct sub-masks configured for the networks they are on.
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The IP is configured for both ports and UDP is correctly configured for the BRX device (deleted and remade several times to make sure). Both ports on are on a network switch but I unplugged the POM and read the UDP packets from the cable (put my computer in place of POM). All devices also have correct sub-masks configured for the networks they are on.
Please screenshot the IP and device configs.