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It is obvious that this mechanism only works if uncoupled cars can be detected by the
track occupancy detector. If necessary, the axles at the end of each train can be made
conductive using an appropriate resistor.
186
Example: Simple Track Occupancy Detection
The following example demonstrates how a track occupancy detection is made possible
using temporary track sensors.
Trigger “Or“
Diagram 126: Simple Track Occupancy Detection
In addition to the contact indicators, an additional flagman indicator is needed for
indication of occupancy.
• Place or select the contact indicators into the track diagram and specify the digital
addresses of the respective track sensors.
• Create a flagman for indication of occupancy.
• Specify both contact indicators as trigger of the flagman using the option Or.
• Set the memory of the flagman to Toggle.
Flagman
Trigger Memory
Left
Toggle
OR
Right
Table 9: Simple Track Occupancy Detection
When a train enters the track section between the track sensors the flagman is turned on
by its trigger. When the train leaves the track section, the corresponding contact indicator
is turned on. This event is again reported to the flagman through its trigger. The option
Toggle now makes sure that the flagman is turned off.