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Diagram 125: Detecting uncoupled Cars
• Place or select a contact indicator in the track diagram and specify the digital address
of the respective track occupancy detector.
• Create the two flagmen “Timer” and “Alarm”.
• Specify the occupancy detector in the “on” state as trigger of flagman “Timer”.
• Set the memory of flagman “Timer” to turning off After 30 Seconds and select the
Forced Reset option.
• Specify “Timer” in the “off” state as trigger of flagman “Alarm”.
• Specify the track occupancy detector in the “on” state as condition of flagman
“Alarm”.
• Specify the appropriate operations to be performed when flagman “Alarm” is turned
on (e.g. emergency stop of all trains).
Timer
Alarm
Trigger Conditions Operationen Memory
Occupancy
Detector
Timer Occupancy
Detector
Table 8: Detecting uncoupled Cars
- - Forced Reset:
After 30
Seconds
appropriate
emergency
operations
When the track occupancy detector is passed by a train, the flagman “timer” is turned
on by its trigger. It remains on for 30 seconds. After 30 seconds, the “timer” is turned
off again, even if the track occupancy detector is still turned on – this is done because
the Forced Reset option is selected. Turning off flagman “timer” is reported to the
flagman “alarm” by the trigger of “alarm”. The flagman “alarm” now checks its condition,
i.e. if the track occupancy detector is still turned on by some inadvertently uncoupled
cars. If this is the case then “alarm” is turned on and performs the emergency operations.
The time period specified as memory of flagman “timer” must be large enough to enable
the longest/slowest train to leave the occupancy detector. Otherwise a false alarm
would be triggered. On the other hand the time period must be shorter than the interval
between two successive trains. Otherwise it could happen that the next train has already
turned on the occupancy sensor when the “timer” is turned off.
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