Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 250 of 265
stream, failures on any vehicle phases can easily be configured to blackout all the
phases of both streams, i.e.
Phases Inhibited or Blacked-Out
A B C X Y Z A2 B2 F2
Phases With a 2nd Red
Lamp Fault Confirmed
A
1 1 1 1 1 1 1 1
B 1 1 1 1 1 1 1 1
C 1 1 1 1 1 1 1 1
X 1 1 1 1 1 1 1 1
Y 1 1 1 1 1 1 1 1
Z
A2 1 1 1 1 1 1 1 1
B2
F2
Figure 44 – Second Red Lamp Failure (Example 2)
If the ‘fail to part-time’ facility is used rather than the above table, special
conditioning can be used to force the other stream(s) to also immediately enter their
‘fail to part-time’ state when a second red lamp fault is present on any stream.
Where there is a mix of stand-alone pedestrian streams and intersection streams on
the controller, it is still possible to configure the actions across those multiple
streams.
For example, when a second red lamp fault is confirmed on the intersection stream it
can inhibit pedestrian phases within that intersection stream and also extinguish the
stand-alone pedestrian stream (shown in red).
Phases Inhibited or Blacked-Out
A B X Y Z A2 B2 F2
Phases With a 2nd Red
Lamp Fault Confirmed
A
1 1 1 1 1 1 1
B
X 1 1 1 1
Y 1 1 1
Z
A2 1 1 1
B2
F2
Figure 45 – Second Red Lamp Failure (Example 3)
In the above example, second red lamp failures on the vehicle phases of the
intersection stream (X, Y, A2) are configured to inhibit the pedestrian phases in that
stream (Z and B2) and extinguish the stand-alone stream (A and B).
This will inhibit the phases
and not extinguish them!
See Note