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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 74 of 176
667/HE/53000/000
Issue 2
Unrestricted
Plus
+
Signal Head
The Plus
+
signal head consists of a number of Plus
+
Aspects (each containing a Plus
+
LED plate), a
ByPass module and RAG Node all housed within a standard Helios housing. The RAG Node is
mounted behind the Green aspect door.
Instructions for mounting, replacing Helios signal heads and mounting items such as the Solar Cell
can be found in the Helios Handbook 667/HB/30000/000.
Side Mounted Boxes
If there is a need for side or inline mounted boxes, the mounting is as standard, however the
aspect for a Green Arrow will be connected to the GREEN2 connector (see section 4.2.3).
If there is a need for a further side mounted box (e.g. second Green Arrow optic), an additional
RAG Node will be allocated and will be mounted within the second Green Arrow box.
4.2.1
RAG Node : Overview
The RAG Node is the interface between the CIC (power / communications distribution) and the
Plus
+
LED aspect.
The Plus
+
LED plate contains pre-programmed asset data which, when interrogated by the
associated Node, provides information about the colour of the LEDs on the plate. The Node then
has a number of checks to ensure the correct aspect colours are connected to the correct output
connectors. The Plus
+
RAG node is able to confirm operation of the Plus
+
LED aspect and will send
appropriate diagnostic information about that as well as about itself back through the CIC to the
controller.