FAQ - PROFINET Questions

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Frequently Asked PROFINET Questions

This page contains PROFINET questions that our experts have answered. Pick your subject:

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Is it worth getting switches for PROFINET that support LLDP?
If you have the financial resources to buy an LLDP (PROFINET class B) switch, I recommend you to do it. There are more and more tools and devices coming on the market that can work with this protocol and it can be beneficial to your asset management / maintenance work.

Can I use the ERTEC ASIC as standard Ethernet controller?
YES, The ERTEC 200/400 can be used as standard Ethernet controller with up to 4 ports.

In Wireshark I cannot see the VLAN tag in the PROFINET messages. What is the reason for this?
Probably the Ethernet card and/or driver of your PC filters away the VLAN tag. You have to enable it with the properties in Windows or add some lines in the Registry. You can request a document from us that describes what to add to the Registry.

Do I still require a mirror port on a switch if I monitor a PROFINET network with a ProfiTap?
NO, the ProfiTap has to placed between the PLC (PNIO controller) and the 1st switch. You save a mirror port and there is no risk that the Laptop/PC sends data on your network, but you have to "break" the cable to insert the ProfiTap and that automatically means a temporarily disturbance. I recommend to insert the ProfiTap during the cabling phase and leave it permanently in the loop.