User's Manual

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Figure 2.13 – Standard NEMA 8-Phase Number Scheme
Phases 1, 2, 5, and 6 are often used for the “main” street and phases 3, 4, 7 and 8
are often used for the “side” street as shown in Figure 2.13.
Since each Matrix unit often detects both the left-turn phase and the through-
movement phase for a single approach, the associated rack card will have often
have channels that correspond to one of the following phase (ф) pairs: ф2 and ф5,
ф6 and ф1, ф4 and ф7, ф8 and ф3.
NEMA TS2, 2070, and other advanced traffic cabinet systems usually allow
software programming of the detector card channel outputs to traffic phases via a
channel-to-phase mapping grid in the controller menu. Figure 2.14 illustrates how
the detector channels 1 to 16 of a NEMA TS-2 rack can be assigned to the standard
8-phases using four Click! 114 cards. The rack card slots are numbered across the
top and the channel positions are represented by the gray labels C1 – C16.
Note
In the chapter on SmartSensor Manger Matrix Tools, you will find a section
about Rack Card Tools which explains how the channel to phase mapping can
be verified with or without the sensors installed.