Directed ADS communication
One of the properties of ADS routes is that they can be directed. This property was supplemented within the scope of Secure ADS, but is generally available for routes.
Once they have been opened at network level, ADS routes are used for communication on both sides by the respective ADS applications. This behavior is very efficient, but may be undesirable. For example, an engineering computer (XAE) is supposed to have access to a runtime (XAR) system in the normal case, but it is not necessary for an XAR system to access the XAE system via ADS.
Therefore, this direction can be limited in that a corresponding system (the XAE in the example) does not accept any ADS request commands via the route.
The chapter Configuration describes the procedure for limiting the properties.