CLICK HERE FOR INDEX PAGE

SYSTEMS PREPARATION QUESTIONS 2007 - 12

V. Ryan © 2008

 

The miniature train control system shown below has INPUTS and OUTPUTS. Each input and output has a number - these are listed on the diagram below.

 

Write the control sequence for the following sequence of events: Please note, when the barrier is raised/open it is ‘ON’. When the barrier is lowered/closed it is ‘OFF’. The first five stages have already been completed.

ANSWER  
Suggest two improvements to the miniature train control system shown in the diagram above.
   
IMPROVEMENT 1:
 
   
IMPROVEMENT 2:
 
 
ANSWER
   

IMPROVEMENT 1: The system should have an audible (sound) warning as well. This would allow the drivers to hear as well as see warnings that the barrier is about to be closed.


IMPROVEMENT 2: The system should have two sensors that detect the presence of trains. This would mean that the system would work safely even if one of the sensors failed.

     
CLICK HERE FOR ELECTRONICS INDEX PAGE
     
 
Google
 
Web www.technologystudent.com