1734 AENT Network Status Flashing

plvlce said:

Do you mean that the PLC has two network ports with different IP addresses? Or that it has one of these two addresses and the NAT device is configured to map the other address to that one?

The issue is pretty clearly that the two devices just aren't talking to each other, and the most likely culprit is something in your NAT setup.

Having the AENT on a separate network from the PLC is definitely an unusual setup in my experience; usually I'd set them up on the same (private) network, then use NAT to allow the public network to access the PLC but other devices.

Click to expand...

helphelphelp said:

How would I go about checking? I don't see the HMI in the IO configuration tab.

Click to expand...

Snyd1 said:

Have you tried the reset module, or cycling power? Also are your thumbwheels set correctly? Did you use BOOTP to set your IP and click disable DHCP after adding the relation and cycling power?

Click to expand...

Snyd1 said:

Have you tried the reset module, or cycling power? Also are your thumbwheels set correctly? Did you use BOOTP to set your IP and click disable DHCP after adding the relation and cycling power?

Click to expand...

RockyLeafs said:

HMI's arent in the Ethernet module setup. there is no Ethernet/IP connection with them, They are TCP.

If you double click a module the general tab will show the IP network setting

Click to expand...

plvlce said:

Can you diagram how the network is physically set up? What is the physical connection relationship between the PLC, the AENT, and the NAT device.

Is your gateway address on both devices pointing at the NAT device?

Click to expand...

helphelphelp said:

The PLC is connected to an ethernet switch inside the cabinet. Also connected to this switch is the a programming port, the HMI, a computer and my newly added 1734 AENT. The switch is connected to a NAT device.

Click to expand...

Yes the gateway is the same for both devices.

Click to expand...

plvlce said:

The PLC and AENT are on the same network both physically and logically then, and there's no need to involve the NAT in communication between them. Your setting in the PLC's module definition for the AENT should be its 192.168.1.xxx address.

The NAT allows devices outside the network to communicate with devices inside it using the 10.201.104.xxx addresses. In this case both devices are inside it; I am unsure if it is even possible for devices inside the network to use the external addresses to communicate with each other.



Is the gateway address also the address of the local port of the NAT device (probably 192.168.1.1)?

Click to expand...

helphelphelp said:

Ok so you think if I switch the IP address of the Point IO in the IO configuration to 192.168.1.40 if I'm understanding correctly? Just curious as to why it would be on that address while in the IO configuration for the L24ER it is the 10.201.104.xxx address.

Click to expand...

plvlce said:

Are there two separate I/O configurations where it is set as 10.201.104.xxx?

Since the PLC has an internal address of 192.168.1.xxx, setting a module address for a device in the PLC that's anything other than 192.168.1.xxx is basically telling it that the device is on an outside network and communication should be routed through the NAT device. It's like trying to mail your next door neighbor a package but telling the post office it's international -- the post office might be able to figure it out, but the router apparently isn't capable of detecting it's actually local and connecting back through the local network.

Click to expand...

_Dock_ said:

I haven’t read all the details of this discussion but it appears that you have the modules set to the public address. Shouldn’t these be set to the private address? The nat router will translate the address PRIVATE to public.

Click to expand...

helphelphelp said:

Just curious as to why it would be on that address while in the IO configuration for the L24ER it is the 10.201.104.xxx address.

Click to expand...