2010 Construction and Material Specifications - Ohio Department of ...

733.06
The master controller is typically located in a local intersection cabinet; however,
in special circumstances it may be located at a Remote Monitoring Station site.
The master controller is capable of uploading/downloading information to local
intersection controllers and the Remote Monitoring Station.
B. Functional Requirements.
1. Design. Furnish a solid state, digital microprocessor master
controller design. Furnish a controller that uses menu driven prompts, unless of
Type 170 design. If the master controller is used with Type 170E or Type 2070
controllers, provide software unless otherwise shown on the plans.
Furnish a master controller that has a RS-232 port for connection to a
laptop computer or printer. Furnish software and connector cables for
communication with a laptop.
2. Local Controllers. Ensure that each master controller is able to
supervise and communicate with at least 24 local intersection controllers.
3. System Detectors. Ensure that each master controller is able to
analyze traffic sensor data from at least 32 system detectors. Distribute system
detectors up to eight per intersection, but do not exceed the total system sensor
capacity.
Ensure that the detectors are assignable to each of the computational
channels in each group, with the channels representing cycle selection,
directionality (offset), non-arterial flow (split), and special congestion indicators of
queue or occupancy.
Furnish a master controller that is capable of monitoring and detecting
system detector failure and removing failed detectors from volume and occupancy
calculations. Upon resumption of satisfactory sensor operation, sensors shall
automatically resume input to volume and occupancy calculations.
4. Timing Patterns. Ensure that each master controller provides a
minimum of 16 selectable patterns. Ensure that each pattern shall consist of a
combination of cycle, offset, and split numbers for each intersection in the system.
Furnish a master controller that is capable of implementing a “free”
mode whereby all intersection controllers will operate without system coordination
and a “flash” mode whereby all intersection controllers will operate in a flashing
operation.
5. Operational Modes. Ensure that each master controller is able to
operate in the following modes of operational control:
a. Traffic responsive mode whereby pattern selection is based on
dynamic traffic conditions as measured by system sensors located in the control
area. As a minimum, base the pattern selection on the quantitative traffic flow
parameters of volume, occupancy, and directionality of the arterial traffic.
Base transfer of patterns on programmable threshold values. Furnish
system sensors that are capable of selective weighting.
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