Posted 14 Mar 2016 I use Netgear routers with multi-NAT capability to attach machines to the company LAN. One of the advantages is that similar machines can have identical network addressing schemes while a multi-NAT router on each machine can be used to assign unique external addresses. The usual error on these setups is to forget to assign a gateway IP address and so the PLC can't respond to requests from outside its subnet. I have the router set up as normal (as I have done a hundred times before on other machines). PLC has correct IP address, subnet and gateway (that of the router LAN address). Router has NAT rule configured, correct LAN subnet, etc. I can PING the PLC from the company network. This implies that the router, wiring, etc., are all OK. If I disconnect the PLC ethernet cable during a PING I get errors. This implies that the address is unique, etc. Controller --> Communication Setup --> Ethernet connection via hub --> Ethernet communication test --> "A communication error has occurred." Has anyone seen this? Any reason why it shouldn't work as I expect? Many thanks. Share this post Link to post Share on other sites
Posted 14 Mar 2016 Did you try to go online with the controller as well? I have seen where the test can fail, but it is still able to connect. Share this post Link to post Share on other sites
Posted 16 Mar 2016 I tried to go online as you suggested but that failed too. I can connect locally but I'm having trouble transferring the program. See my other post, if you have time. Thanks. Share this post Link to post Share on other sites