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Diagram 91 shows a block driven by one occupancy (B) and two momentary sensors (A
and C). Each of these sensors is associated with a contact indicator in the software
called A, B and C. All indicators are assigned to the same block in the software. The
block is indicated as occupied as soon as a train enters section B from any direction.
The block remains occupied until the train leaves section B. The indicator A is additionally
used as stop indicator for trains running to the left, C acts as stop indicator for
trains running to the right. Both indicators additionally act as brake indicators for the
opposite direction, respectively. The location of A and C should ensure, that each train
is safely stopped before touching one of the switches. On the other side the longest train
should completely fit into the block when being stopped. For this reason A or C, respectively,
where trains are stopped, must be located close enough to the boundaries of the
complete block.
The configuration displayed in Diagram 91 is usually less expensive then that displayed
in Diagram 90, because momentary contacts are usually less expensive then occupancy
sensors.
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A C
Diagram 92: Simple Block with two momentary sensors
Diagram 92 shows a simple configuration of block driven by two momentary sensors.
Both sensors are associated with a contact indicator in the software called A and C.
Both indicators are assigned to the same block in the software. The indicator A is additionally
used as stop indicator for trains running to the left, C acts as stop indicator for
trains running to the right. Both indicators additionally act as brake indicators for the
opposite direction, respectively. The location of A and C should ensure, that each train
is safely stopped before touching one of the switches. On the other side the longest train
should completely fit into the block when being stopped. For this reason A or C, respectively,
where trains are stopped, must be located close enough to the boundaries of the
complete block.
The configuration displayed in Diagram 92 is very simple and inexpensive but has also
some disadvantages. Block occupancy is not indicated. As long as the block is reserved
for a train located inside this block this causes no major problem, because the Dispatcher
will not allow another train to enter this block. But certain measures are to be