There are various functions in vs | plus that analyse data according to defined rules. This is, for example, the extension of a traffic stream. 

The detectors are primarily responsible for the extension. Whether a detector extends depends on its extension parameters. There is also an extension identifier or parallel extension that can influence the extension of the traffic stream. There are two functions in open vs | plus for extending a traffic stream. 


  • Configuration: This function is used to define whether the vs | plus standard criterion, the user criterion or a combination is used. The following options are available:
    • F_AUS (F_OFF): Only the evaluation of vs | plus is taken into account.
    • F_EIN (F_ON): Only the evaluation of free programming is taken into account.
    • F_UND (F_AND): The evaluation of the free programming and vs | plus are linked by AND.
    • F_ODER (F_OR): The evaluation of the free programming and vs | plus are linked with OR.
  • Value: This function is used to specify whether a criterion is fulfilled or not. 


Figure 101: Example

An example in which the congestion functionality of a detector is influenced. 

  • This influence by open vs | plus is only active in programme 1. The configuration is switched on (F_EIN) or off (F_AUS) depending on the active programme. 
  • If the configuration is active (F_EIN / F_ON), only the set value of open vs | plus should be looked at. 
  • Before checking whether there is congestion, the value for congestion is set to "Wrong" (false). This means that there is no congestion. 
  • There are two conditions that must be met for the value to be set to "Right" (true). 
  • This check is processed every second and the values are set accordingly. 


This example shows that it is very easy to override the parameterised standard behaviour of vs | plus using the functions for standard evaluation in special cases and start a different process.