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Communication Over Ethernet

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  • Communication Over Ethernet

    We have multiple panels connected to our local PLCs on the plant floor. We can connect to our PLC through our automation network but cannot see the panels to update them. We have to go directly to the PLC and connect to it before being able to communicate with the actual cmore HMI. Is there a way around this?


  • #2
    If the CMore is connected to a switch, and the PLC is connected to a switch, and that switch connects back to your network then you can talk to them both over the network.
    You will most likely want managed switches that have IGMP Snooping you can use to filter out HMI and PLC traffic that doesnt belong from hammering your main network.

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    • #3
      Originally posted by MikeN View Post
      If the CMore is connected to a switch, and the PLC is connected to a switch, and that switch connects back to your network then you can talk to them both over the network.
      You will most likely want managed switches that have IGMP Snooping you can use to filter out HMI and PLC traffic that doesnt belong from hammering your main network.
      The PLC has a card in the rack that is connected to our Networked Cisco switch(10.5.55.xxx) and another card(192.168.1.1) that is connected to a small switch in the box where the plc is. the IP Address of the HMI is 192.168.1.10, so I can "see " our PLC Rack but not the HMI.

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      • #4
        Sounds like your LAN is on a 10.x.x.x subnet, and the machine itself has its own local LAN on a 192.168.1.x. You will not be able to see anything on the 192 subnet from the main LAN on the 10.x subnet because they are completely different networks.

        If you want to see all devices on the 192.x subnet, you will need to remove them from that and have all their IPs changed to the 10.x subnet instead. You will also plug your ethernet cable going from the main network to the machine into the switch inside the machine rather than the PLC, and get a second ethernet cable to go from the switch back to the PLC.
        This would eliminate one of the cards in the PLC as it would no longer be needed, and will allow you to talk to the HMI from the main network. However it will also place traffic from the machine onto your main network. many PLCs and HMIs use multicast traffic and this will bog down your main network with traffic. You can solve this traffic issue by using a managed switch inside your machine control panel and using IGMP nooping to filter the multicast traffic.

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