I am not familiar with Allen Bradley ControlLogix PLCs, and it would help if you could provide more details on what services, protocols and data transmission types are required for your application.
However, in terms of remote access, there are two ways to achieve this:
RUT950 supports a number of VPN protocols. For the reference configurations, check the following links:
- OpenVPN link. Instructions here are made for legacy design firmware, but apply for current RutOS as well.
- Wireguard link.
- IPsec link.
Teltonika also provides it's own cloud solution, Remote Management System, which allows to monitor and manage both, the router and the devices connected to the routers. The feature to allow remote access to your controller that I would suggest is VPN HUB. You can see how RMS is configured to enable remote access in this video.