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Applications and How-Tos

Remote Access to Allen Bradley PLCs

Colin Zauner | November 7th, 2016

A few common questions I get from customers: Does the C6 Router support Ethernet/IP, DH+? Can the C6 Router connect to my ControlLogix, MicroLogix, CompactLogix, etc.?


The answer is yes!

remote connection to allen bradley PLC
The C6 Industrial VPN Router can be used with new and legacy AB PLCs


The C6 Router used in conjunction with Combivis Connect software can setup a secure end-to-end VPN connection to your Allen Bradley PLC’s. This post outlines the 6 steps needed to connect to an Allen Bradley PLC. If you’d rather watch this information, here’s a Youtube video.


If you are instead looking for a basic introduction to the C6 Router and how it works – start here or watch this video:

allen bradley remote connect video
YouTube Video – C6 Industrial VPN Router for secure remote access

Without further ado here are the steps to connect to your Allen Bradley PLC.

Step 1: Internet Access to the VPN Router

In order for Combivis Connect to setup a VPN connection, the C6 Router must have internet access. The Router acts as a VPN server and assigns the user PC an IP address within the VPN network ensuring a direct end-to-end connection using secure TCP/UDP ports and SSL/TLS protocol.

This can be accomplished two ways. Either by configuring the WAN interface or configuring the modem with a standard SIM card.


Remote access allen bradley WAN config
WAN configuration interface
Modem configuration interface

Step 2: Configure LAN Interface

The next step is to assign the LAN interface an IP address within the local PLC network. All Allen Bradley PLC’s using EtherNET/IP, DeviceNet, ControlNet, etc. belonging to the subnet of the LAN interface can be reached via the VPN tunnel.

LAN configuration screen


Step 3: Serial Port Configuration

Allen Bradley PLC’s using serial protocols such as DF1, DH+, or DH485 can also be remotely monitored and programmed. Combivis Connect uses a virtual serial adapter to map to the physical serial port of the C6 router.


Select the correct port setting.


The C6 Industrial Router supports remote connection to legacy PLC-5 and SLC 500 series PLCs as well

Step 4: Register Router to Domain

Before the C6 Router can be connected – it must be assigned to the domain of Combivis Connect. Assign the router a name, and apply the settings.

CONNECT domain registration

Step 5: Connect to C6 Router

Once the router has finished rebooting, the router can be connected to. Simply select the Connect button to establish a connection. Once the router is connected, all Allen Bradley PLC’s can be accessed via the VPN tunnel.


Connected – Basic Diagnostic interface

Step 6: Remote Access with RSLogix

At this point, RSLogix can go online with the PLC and program in desired Controller operating mode.


Remotely accessing Allen Bradley PLC’s is easy and reliable using Combivis Connect and the C6 Router. There is no lengthy setup process or complicated communication driver setup to access your Allen Bradley PLC’s.

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