System items interaction

Within the
FactoryTalk Remote Access
 system architecture, both hardware and software system components interact with each other, by means of a server infrastructure connection between
FactoryTalk Remote Access Manager
 and the remote devices.
The system components are split in three main groups:
  1. FactoryTalk Remote Access Manager
    : Web interface through which a support technician can connect to a remote device to provide assistance from their local computer.
  2. Server infrastructure
    : Connection hosting the user domains.
    • Access Servers
      : They consist of a distributed redundant set of servers that manage the authentication of remote devices and
      FactoryTalk Remote Access Manager
      .
    • Relay Server
      : They consist of a distributed redundant set of servers that act as a relay for an end-to-end connection between
      FactoryTalk Remote Access Manager
       and remote devices.
  3. Remote devices
    : They consist of industrial automation devices installed at a remote location, such as HMIs, IPCs and routers embedding the Runtime.
NOTE: See Client and server connectivity to learn more about this topic.

Remote access process overview

FactoryTalk Remote Access Manager
, Runtime and routers authenticate to an Access Server by means of SSL/TSL outgoing connections, which are usually allowed by firewalls.
When
FactoryTalk Remote Access Manager
 is going to establish a connection to Runtime or a router, the following process occurs:
  1. The affected endpoints select the Relay Server that provides the best round-trip-time.
  2. A secure end-to-end connection establishes between the endpoints and the Relay Server.
  3. The Relay Server forwards any encrypted messages, without decrypting them.
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