Art. 1073.01 Controller
2.Minimum Red Indication (Red Revert). Provision within the controller to ensure a minimum RED signal indication in a phase following the YELLOW CHANGE interval of that phase.
3.Offset. The time relationship expressed in seconds or percent of cycle length, determined by the difference between the starting point of the coordinated phase green and a system reference point.
4.Phase. The green, change, and clearance intervals in a cycle assigned to any independent movement(s) of traffic.
b.Design.
1.Menu Driven Programming. The controller programming software shall utilize a menu structure displayed on a screen. The software shall display on one screen any phase associated parameter for all eight independent phases. The controller shall be capable of being programmed from the front key panel.
2.Electrically Erasable Programmable Read Only Memory (EEPROM) Data Storage. All controller programming data shall be retained utilizing EEPROM technology.
3.RS 232 Connector. The controller shall be provided with a RS 232 connector to interface with a peripheral device. USB or alternate connectors may be substituted with approval of the Engineer.
4.Internal Time Base Coordination. The controller unit shall have internal time base coordination as specified in Article 1073.01(c)(1).
5.Internal Preemption Feature. The controller unit shall preempt the signal according to Article 1073.01(c)(2).
6.Data Key and Ethernet Port. The controller shall have a standard data key and Ethernet port. The data key shall be used for controller database backup, transfer, and management.
c.Functions.
1.Internal Time Base Coordination. The controller shall contain a sufficient memory to retain and implement the following programs and shall be manually programmable by a user from the front panel.
a.At least four cycle lengths, four splits, and three offsets.
b.16 day programs.
c.ten week programs.
d.30 special event programs. Controller Art. 1073.01
e.Automatic daylight savings and leap year adjustments. The controller shall contain a calendar/clock that can be readily set to the nearest week, day, hour, minute, and second of the year. The clock shall have a synchronize to network or GPS time feature. The clock shall use a rechargeable battery powered, temperature compensated oscillator when power is interrupted. The capacity of the battery shall be sufficient to provide 100 consecutive hours of standby operation after 48 hours of normal operation. The clock accuracy shall be 0.005 percent or better when it is on standby power. The controller shall provide a split interval for every phase of the controller. Phase split time shall be entered directly in percent of cycle length or in seconds. The yield and force-off points shall be calculated automatically. The controller shall have the capability to omit any phase during any program. This feature shall be internal to the controller and shall be selectable by the user from the front panel. The offset reference point shall be at the beginning of the coordinated phase green. The offsets shall be in seconds or percent of cycle length and shall be calculated automatically when the cycle length is changed. The controller shall have built-in diagnostics to detect both coordination and hardware failures. In case the coordination is not functioning, the controller shall revert to the free operation mode. The controller shall provide real time display of its stored coordination information. The display shall be easily readable outdoors. The controller shall display the following data. Coordination parameters. Clock data (week of year, day of week, hour, minute, and second). Current operational status. The controller shall upload and download the complete coordination settings.
2.Internal Preemption Feature. The controller shall implement a minimum of six preemption plans according to a preset or programmable priority. Railroad interconnected controllers shall provide for immediate track clearance green re-service upon receipt of each subsequent pre-empt demand. During this re-service all normal vehicle clearance intervals, including red-revert, shall be respected. Pedestrian clearance during railroad pre-emption will be limited to a flashing don’t walk interval in length to the vehicle yellow clearance interval and shall time concurrently with the yellow clearance.
3.The controller shall have the following features. Art. 1073.01 Controller The controller program shall include the option of single entry or dual entry mode of operation. The overlap phases shall be programmable from the front panel or by a method approved by the Engineer. The controller shall cross switch detectors from a left turn phase to an associated through phase according to NEMA dual ring operation. The controller shall interface internally with the transceiver of the same manufacture. The controller program shall include an anti-backup feature. The controller shall have a programmable minimum RED indication (red-revert) feature of up to 9.9 seconds.
1073.02 Flasher Controller.
a.Flasher. The flasher shall be NEMA Type 3 and be according to NEMA Standards for Traffic Control Systems, TS 2. LED indictors shall be provided to track the flasher output.
b.Housing. The flasher shall be enclosed in a weatherproof, cast aluminum cabinet of adequate size. One 15 A circuit breaker shall be provided for the incoming power line.
1073.03 Transceiver. A transceiver shall be microprocessor based and shall
be according to NEMA Standards for Traffic Control Systems, TS 2 and the following.
a.Design. The transceiver shall provide the following. Frequency shift keying or time division multiplexing techniques. Half duplex or full duplex communications. Parity and error checking diagnostics to ensure transmission and reception of valid data at 1200 baud minimum. Keyboard entry of system address from the front panel. Transmitter frequency stability over the NEMA operating temperature range of ± 5 Hz.
b.Functions.
1.The transceiver shall be capable to receive the following command data from a master controller and convey them to the local controller. Cycle lengths, offsets and splits Special functions Coordinated or free mode A systemwide sync Controller Art. 1073.04
2.The transceiver shall monitor the status of the following functions and transmit the information to a master controller. Local controller phase green Local coordinator operation Conflict Flash Manual flash Preemption System detectors (a minimum of four) and local detectors (a minimum of eight)
3.The transceiver shall allow downloading and uploading of the local intersection database. The preemptor and overlap data will not be downloaded.
c.Housing. The transceiver may be integral to the controller or furnished as a separate module in the controller.
1073.04 Master Controller. A master controller shall be microprocessor based
and shall be according to NEMA Standards for Traffic Control Systems, TS 2 and the following.
a.Operation Modes. The master controller shall be capable of operating in any of the following modes.
1.Traffic Responsive. Pattern selection shall be based on traffic conditions measured by system detectors.
2.Time of Day/Day of Week. Preprogrammed selection of patterns shall be based on time of day/day of week.
3.Manual. Pattern selection shall be based on operator command.
b.Design
1.Transceiver. The master controller shall contain a transceiver which shall provide transmission of all required pattern and command data to the local intersection controllers and shall allow reception of status and detector data from each local controller within the control area. The data rate among the master controller and the local controllers shall be 1200 baud minimum.
2.In-Cabinet Modem. The controller cabinet shall contain a NEMA rated modem with communications rate and support as specified on the plans. The modem shall be configured by the vendor to operate with the master controller. The vendor shall furnish documentation containing modem configuration parameters and specific modem initialization strings required for operation with the master controller. Art. 1073.04 Controller
3.Communication Connectivity. Communications and connectivity shall be as specified on the plans.
4.Surge Protection. The controller cabinet shall be equipped with surge suppressers and noise filters for the communicaton line and the modem's power receptacle. These shall be three stage variety containing avalanche diodes, metal-oxide varistors and gas tube arrestors.
5.RS-232 C Interface. The master controller shall be equipped with two RS-232 C interfaces for external communication with a remote personal computer and with a local device such as a portable personal computer or a printer. USB or alternate connectors may be substituted with approval of the Engineer.
6.Keypad Data Entry and Front Panel Display. The master controller shall be programmable via a front keypad entry. A front panel display shall be provided on the master controller for operator monitoring of input values and output commands including. Parameter values Current operating status Pattern command status System sensor activity Cycle synchronization Local controllers and system detectors operation status
c.Functions.
1.Operational Capacity
a.Number of Local Controllers. The master controller shall have the capacity to command and supervise a minimum of 24 local controllers.
b.Number of System Detectors. The master controller shall have the capacity to monitor at least 32 sampling detectors for all controlled intersections and up to 16 sampling detectors for a single intersection. The detectors used as sampling detectors shall be selectable from dedicated sampling detectors or local intersection detectors in any combination.
c.Number of Timing Plans and System Commands. The master controller shall be capable of implementing a minimum of 30 timing plans. Each plan shall consist of a combination of cycle length, offset, and split. The master controller shall be capable of a minimum of four system commands including the commands for controller free or coordinated operation and for controller MUTCD flash operation.
d.Number of Program Events. The master controller shall be capable of providing a minimum of 150 program events. A program event Controller Art. 1073.04 shall consist of a selected time of day, day of the week, and week of the year for which a timing plan, out of a minimum of 30 timing plans, shall be put into effect.
e.Number of Logged Events. The master controller shall be capable of logging a minimum of 100 events under the buffer(s) with a time and date stamp for each event. This data shall be stored in the master controller and retrievable through the remote monitoring microcomputer.
2.Operation Modes.
a.Traffic Responsive Operation. Pattern selection shall be based on user selectable validated volume, occupancy, or concentration data obtained from system detectors to compute the following functions. Level of arterial traffic Directionality of arterial traffic Ratio of a set of detectors to a second set of detectors Ratio of side street to arterial traffic Preferential and/or hierarchical transfer of patterns shall be accomplished via programmable user-specified threshold values.
b.Time of Day/Day of Week Operation. The master controller shall be according to the internal time base coordination as specified in
Article 1073 — 01(c)(1). It shall be possible to select any system
pattern from the master controller on a preprogrammed time of day/day of week basis with automatic daylight savings and leap year adjustments. In addition, it shall be possible to specify the following on a time of day/day of week basis. Special function system commands Crossing artery synchronization Traffic responsive computation period System detector and speed report interval
c.Manual Operation. Pattern selection shall be based on operator command.
3.Remote System Controlling, Reporting, Monitoring, and Diagnosing. The master controller shall be capable of being programmed and monitored from a remote site through a computer program running under the latest Microsoft Operating System either stand alone or a station in a local area network (LAN). The programming and monitoring from the remote site shall include the following functions.
a.Remote System Control. The master controller shall enable upload and download of all master programming as well as local controller programming. Art. 1073.04 Controller
b.Remote System Reporting.
1.System Status Report. When requested a system status report shall be generated. The report shall indicate current operating mode and pattern for local controllers.
2.System Failure Report. This report shall indicate the off line local controllers and the failure time and mode. The master controller shall communicate the local controller faults to the remote site.
3.System Detector Failure Report. All failed system detectors shall be listed on this report.
4.System Detector Report. The volume and occupancy data from any of the system detectors, tabulated by 15 minute intervals for a 24 hour period shall be included on this report.
5.System Fault Alarms. The master controller shall have the capability of programmable fault reporting by sending alarms as specified in the plans. A minimum of three levels of programmable alarms shall be provided.
6.System Operation Report. This report or an equivalent shall indicate the time of changes in operation mode and the timing patterns for the past 48 hours.
c.Remote System Monitoring.
1.Number of Systems Monitored. The remote system software shall be capable of monitoring a minimum of 99 separate systems.
2.Data Compatibility Between the Software Versions. Data from earlier versions of the remote system monitor software shall be compatible with or easily translatable for use in newer version upgrade. Manual reconstruction of the database shall not be required with each upgrade. All software located in controllers and master controllers, which are currently in use in the field and new, shall be compatible with all current or new versions of the remote system monitor software. The version of the software for all master and local controllers shall be uploaded and viewed during each upload and download. As part of a database set up, the remote system monitor software shall not require master and local controller software versions to be manually programmed, except for the master and local controller model numbers or types. All firmware changes made at any master or local controller shall be transparent to the remote system monitor software.
3.Intersection and System Graphics. Each intersection display and system display shall be capable of displaying a mode of Control Equipment Art. 1074.01 operation, that is, traffic responsive, time of day, or free, and the timing plan in effect for the coordinated operation, that is, cycle length, split, and offset. The display shall be capable of displaying indicators for all used controller phases and associated pedestrian phases, overlap phases, local detector actuation, and system detector actuation.
d.System Diagnostics.
1.Local Controller Diagnostic. At a minimum the master controller shall diagnose and report local controller flash fault by reporting the conflict monitor/malfunction management unit fault logging information for the current fault.
2.System Detector Diagnostic. Each system detector shall be monitored for constant calls, absence of calls, or erratic output. Diagnostic values shall be user programmable for all detectors on a system basis. System detectors which fail the diagnostic test shall be automatically deleted for volume and occupancy calculations. The event of failure occurrence shall be stored for reporting. Upon resumption of satisfactory operation, detectors shall automatically resume input to volume and occupancy calculations. SECTION 1074. CONTROL EQUIPMENT
1074.01 Digital Time Switch. The digital time switch shall be according to
NEMA Standards for Traffic Control Systems, TS 2, and the following.
a.Functions. The digital time switch shall be capable of opening and closing a circuit at specific times of a day and shall be capable of omitting circuit operation during certain days of the week. It shall be possible to set any opening or closing to the nearest minute. The minimum open period shall be 90 minutes and the minimum close period shall be 30 minutes. It shall also be capable of providing four "on" and four "off" operations in each 24 hour period. All settings shall be field programmable using a key pad.
b.Designs. The digital time switch shall contain a precise clock based on a seven day program, settable to the nearest second of the week, day, hour, and minute. The clock shall automatically adjust for daylight savings and leap years. The digital time switch shall have a battery back-up feature to protect against loss of timing in case of a power failure. During power failure, the battery operation shall keep the unit in time for a period of up to 100 hours. The unit clock accuracy shall be 0.005 percent or better when it is on battery power and shall assume normal operation upon resumption of power.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1017–1024 of 1,217. View official source ↗