EDI 210E Manuel utilisateur

THIS MANUAL CONTAINS TECHNICAL INFORMATION FOR THE FOLLOWING SERIES

OF MODEL 210/2010/2018 SIGNAL MONITORS, PCB Issue G:

210E, 210ECL, 2010, 2010ECL, 2010ECLip, 2018ECL, 2018ECLip

REVISION: NOVEMBER 2014

pn 888-2010-002

- NOTE -

EDI ECCOM SOFTWARE MUST BE UPDATED TO VERSION 3.8.0 OR

GREATER FOR COMPATIBILITY WITH THIS FIRMWARE VERSION.

THE ECCOM SOFTWARE IS AVAILABLE FREE OF CHARGE AT

WWW.EDITRAFFIC.COM

210E - 210ECL - 2010ECL - 2018ECL

RMS Signal Monitor

Operations Manual

THE 210/2010/2018 SERIES SIGNAL MONITOR UNIT IS DESIGNED AND

MANUFACTURED IN THE USA BY EBERLE DESIGN INC., PHOENIX, ARIZONA, AN

ISO 9001:2008 REGISTERED COMPANY

INFORMATION CONTAINED HEREIN IS PROPRIETARY TECHNICAL INFORMATION

OF EBERLE DESIGN INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE OR

PART IS NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING.

MAINTENANCE NOTE

EBERLE DESIGN INC. SIGNAL MONITORS HAVE BEEN

CAREFULLY INSPECTED AND TESTED TO ENSURE PROPER

OPERATION. IT IS RECOMMENDED THAT THE SIGNAL MONITOR

BE TESTED AT LEAST ANNUALLY TO ENSURE COMPLIANCE

WITH THE PROPER SPECIFICATIONS.

SECTION 4.1.2, SPECIAL FUNCTION INPUTS

SPECIAL FUNCTION #2 HAS BEEN DISABLED TO PROVIDE

COMPATIBILITY WITH THE MT-180 MONITOR TESTER.

RESISTOR R31 HAS BEEN REMOVED TO DISABLE THIS

CIRCUIT. IF SPECIAL FUNCTION #2 INPUT IS REQUIRED, R31

(150K OHMS, 1/2W) SHOULD BE INSTALLED.

- WARNING -

THE P1 RED INTERFACE CABLE SHOULD ALWAYS BE UNPLUGGED

BEFORE REMOVING THE UNIT FROM THE CABINET TO PREVENT

POTENTIAL EXPOSURE TO ELECTRICAL SHOCK.

- WARNING -

PIN 27 OF THE MAIN CONNECTOR PROVIDES THE CLOSED CONTACT OF

THE OUTPUT RELAY WHEN THE MONITOR IS IN THE NO-FAULT STATE.

WHEN THE MONITOR IS IN THE NO-FAULT STATE AND THE AUTO/FLASH

SWITCH IS IN THE FLASH POSITION, AC LINE VOLTAGE MAY BE PRESENT

ON PIN 27.

THIS PIN WAS PREVIOUSLY DEFINED AS A “NO-CONNECT’ PIN IN LEGACY

EQUIPMENT. TO PREVENT POTENTIAL EXPOSURE TO ELECTRICAL

SHOCK, BEFORE INSTALLING THIS MONITOR THE USER IS CAUTIONED

TO CHECK THAT THE CABINET WIRING IS COMPATIBLE WITH THE USE OF

THIS PIN AS A SOURCE OF AC LINE VOLTAGE.

Table of Contents

Section 1 BASIC FUNCTIONS .............................................................................................1

1.1 Model Description ......................................................................................................1

1.2 Basic Functions .........................................................................................................1

1.2.1 Conflict Monitoring ...........................................................................................1

1.2.2 24VDC Monitoring ............................................................................................1

1.2.3 Controller Watchdog Monitoring (WDT Error) ..................................................2

Section 2 EXTENDED FEATURES ......................................................................................3

2.1 Hardware Features ....................................................................................................3

2.2 Red Failure Monitoring ..............................................................................................3

2.2.1 Red Fail SSM Enable .......................................................................................3

2.2.2 Red Interface Cable Fault ................................................................................4

2.3 GYR-Dual Indication Monitoring ................................................................................4

2.3.1 GY-Dual Indication Monitoring .........................................................................4

2.4 Clearance (Short or Absent Yellow) Monitoring.........................................................4

2.5 AC Line Brown-out Detection ....................................................................................5

2.5.1 Minimum Flash Time ........................................................................................5

2.6 LEDguard®LED Field Signal Sensing .......................................................................5

2.7 Recurrent Pulse Detection.........................................................................................5

2.8 Exit Flash ...................................................................................................................6

2.9 Non-Volatile Fault Memory ........................................................................................6

2.10 PCA (Program Card Absent) Indication...................................................................6

2.11 Configuration Change Monitoring ............................................................................7

2.12 Internal MPU Watchdog...........................................................................................7

2.13 Reset Input Detection ..............................................................................................7

2.14 LED Test..................................................................................................................7

2.15 Memory Test............................................................................................................7

2.16 Watchdog Monitoring Disabled Indicator .................................................................8

2.17 Red Failure Monitor Disabled Indicator ...................................................................8

2.18 Diagnostic Display Mode (210E / 2010) ..................................................................8

2.18.1 No Fault Diagnostic Display ...........................................................................8

2.18.2 Fault Diagnostic Display.................................................................................8

2.19 Diagnostic Display Mode (210ECL / 2010ECL /2018ECL)......................................9

2.19.1 No Fault Diagnostic Display ...........................................................................9

2.19.2 Fault Diagnostic Display.................................................................................9

2.20 Flashing Yellow Arrow (FYA) Overview.................................................................10

2.20.1 FYA Mode ....................................................................................................10

2.20.2 FYAc (Compact) Mode.................................................................................13

Section 3 EVENT LOGGING FEATURES..........................................................................17

3.1 Basic Front Panel Fault Event Display ....................................................................17

3.2 Model 210ECL / 2010ECL /2018ECL Status/Event Reporting ................................17

3.2.1 BI Tran Systems 233 Program Monitor Status...............................................17

3.2.2 EDI ECcom Monitor Report............................................................................17

3.2.3 EDI ECcom Monitor Event Log Examples .....................................................18

Section 4 INSTALLATION ..................................................................................................21

4.1 Adapting Red Monitoring .........................................................................................21

4.1.1 Red Field Inputs .............................................................................................21

4.1.2 Special Function Preempt Inputs (SF1, SF2).................................................21

4.2 SSM Switch Programming.......................................................................................22

4.3 Program Card Programming....................................................................................22

4.3.1 Yellow Disable Jumpers .................................................................................22

4.4 Option Switch Programming ....................................................................................22

4.4.1 Red Fail Timing Switch ..................................................................................22

4.4.2 Recurrent Pulse (RP) Disable Switch (RP DISABLE)....................................22

4.4.3 WDT Timing Switch........................................................................................23

4.4.4 GY Enable Switch ..........................................................................................23

4.4.5 Polarity Switch................................................................................................23

4.4.6 LEDguard Switch ...........................................................................................23

4.4.7 RF SSM Switch ..............................................................................................23

4.4.8 FYA Mode Switch...........................................................................................23

4.5 Select Jumper Programming ...................................................................................23

4.5.1 Watchdog Latch Select (SEL1) ......................................................................23

4.5.2 Minimum Flash Enable Select (SEL2) ...........................................................24

4.5.3 Configuration Change Fault Select (SEL3) ....................................................24

4.5.4 Red Interface Cable Fault Select (SEL4) .......................................................24

4.5.5 AC Line Brown-out Select (SEL5)..................................................................24

4.5.6 EE Input Polarity Select (SEL9) .....................................................................24

4.5.7 FYA FlashRate Monitor disable (SEL15) .......................................................24

4.6 Watchdog Programming ..........................................................................................24

4.6.1 Watchdog Enable Switch ...............................................................................24

4.6.2 Watchdog Timing Option................................................................................24

Section 5 FRONT PANEL DESCRIPTION .........................................................................25

5.1 Indicators .................................................................................................................25

5.1.1 (G) AC POWER Indicator...............................................................................25

5.1.2 (Y) VDC FAILED Indicator .............................................................................25

5.1.3 (R) WDT ERROR Indicator ............................................................................25

5.1.4 CONFLICT Indicator ......................................................................................25

5.1.5 RED FAIL Indicator ........................................................................................25

5.1.6 DUAL IND Indicator........................................................................................25

5.1.7 CLEARANCE Indicator ..................................................................................25

5.1.8 PCA Indicator .................................................................................................26

5.1.9 DIAGNOSTIC Indicator ..................................................................................26

5.1.10 RP DETECT Indicator ..................................................................................26

5.1.11 COMM Indicator ...........................................................................................26

5.1.12 CHANNEL STATUS Indicators (210E / 2010) .............................................26

5.1.13 CHANNEL STATUS Indicators (210ECL / 2010ECL / 2018ECL)................26

5.2 Front Panel Controls................................................................................................26

5.2.1 RESET Button ................................................................................................26

5.3 Red Interface Connector (P1)..................................................................................27

Section 6 CIRCUIT OPERATION .......................................................................................28

6.1 Introduction ..............................................................................................................28

6.2 Main MPU Logic ......................................................................................................28

6.3 Serial Peripheral Interface (SPI) ..............................................................................28

6.4 Internal MPU Watchdog...........................................................................................28

6.5 EEprom Memory......................................................................................................28

6.6 24Vdc Logic Inputs ..................................................................................................28

6.7 Real Time Clock ......................................................................................................29

6.8 Display .....................................................................................................................29

6.9 Program Card and Switch Inputs.............................................................................29

6.10 RMS-Engine ..........................................................................................................29

6.11 Power Supply.........................................................................................................29

6.12 EIA-232 Communications Port ..............................................................................29

6.13 Ethernet Communications Port..............................................................................29

Section 7 TROUBLE SHOOTING.......................................................................................30

Section 8 SPECIFICATIONS ..............................................................................................32

8.1 Electrical ..................................................................................................................32

8.1.1 Power Requirements......................................................................................32

8.1.2 AC Voltage Monitors ......................................................................................32

8.1.3 DC Voltage Monitors ......................................................................................32

8.1.4 Outputs...........................................................................................................32

8.2 Timing Functions .....................................................................................................33

8.3 Mechanical...............................................................................................................33

8.4 Environmental..........................................................................................................33

Section 9 WIRING ASSIGNMENTS ...................................................................................34

9.1 Monitor Unit Connector (P6) ....................................................................................34

9.1.1 Sixteen Channel .............................................................................................34

9.1.2 Eighteen Channel...........................................................................................35

9.2 Program Card Connector.........................................................................................35

9.2.1 Sixteen Channel .............................................................................................35

9.2.2 Eighteen Channel...........................................................................................36

9.3 Red Interface Connector (P1)..................................................................................37

9.4 EIA-232 Connector (J1) ...........................................................................................37

9.4.1 EIA-232 Cable to a PC ...................................................................................38

9.4.2 EIA-232 Cable to a 170 Controller Unit..........................................................38

9.5 Ethernet LAN Port....................................................................................................38

9.5.1 Ethernet LAN Cable .......................................................................................38

9.6 16-Channel Program Card Diagram ........................................................................38

210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 1

Section 1

BASIC FUNCTIONS

1.1 MODEL DESCRIPTION

The Signal Monitor consists of five models; the 210E, 210ECL, 2010, 2010ECL and

2018ECL. The model 210E is the base unit. The model 2010ECL and 2018ECL add an

EIA-232 serial port that gives the unit the capability to communicate with a Controller Unit

or PC based operational software for status and fault event data. The model 2010ECL and

2018ECL also add an enhanced event logging capability for full time stamped event

reporting. The model 2010, 2010ECL, and 2018ECL units are configured to be compatible

with the requirements of both the 170 Controller Unit and the 2070 Advanced Traffic

Controller. The model 210E and 210ECL units are compatible with the requirements of the

170 Controller Unit. The model 2018ECL is equivalent to the 2010ECL but provides

eighteen channels. The “ip” models replace the EIA-232 port with a 10/100 Mbps Ethernet

port. Where not specified otherwise, the information in this manual will apply to all models.

1.2 BASIC FUNCTIONS

The Signal Monitor is a device used in a traffic controller assembly to monitor traffic signals

at an intersection for conflicting proceed indications caused by malfunctions of the

controller, load switches, field wiring and loads, or miss-wiring of the cabinet. The Signal

Monitor also provides error sensing of the cabinet 24VDC supply and monitors the

controller Watchdog output. The Signal Monitor is directly interchangeable with a standard

model 210 Signal Monitor and complies with all specifications outlined in Chapter 4 (Model

210 Monitor Specifications) of the Caltrans Traffic Signal Control Equipment Specifications

(January 1989).

When triggered by the detection of a fault condition which exists longer than the minimum

period, the Signal Monitor will enter the fault mode causing the Output relay contacts to

close and enabling the Stop-Time output to the controller. The cabinet assembly should be

wired such that the closure of the Output relay contacts will cause an automatic switching

of the field signal outputs from normal operation to flashing operation. The Signal Monitor

will then display the appropriate fault indications and will remain in this fault mode until a

reset command is issued. The loss of AC Line power will not reset the fault mode (except

Diagnostic Fail). In the event of AC Line power loss the Signal Monitor will retain the status

of all fault and channel indicators and will display the correct fault and channel status upon

restoration of AC Line power.

1.2.1 CONFLICT MONITORING

The Signal Monitor is capable of monitoring 16 channels (2018ECL provides 18 channels).

Each channel consists of a Green, Yellow, and Red field signal output. A Program Card is

provided for assigning conflicting channels and inhibiting Yellow monitoring for required

channels. The Signal Monitor detects the presence of conflicting Green or Yellow signals

on the AC field terminations between any two or more channels assigned to conflict on the

Program Card. The monitoring circuitry is capable of detecting either full wave or positive

and negative half-wave field signal outputs at the specified voltage levels.

1.2.2 24VDC MONITORING

Sensing of the cabinet 24VDC supply is provided as specified in Section 4.2, Chapter 4 of

the Caltrans Traffic Signal Control Equipment Specifications. When the 24VDC input falls

below the specified voltage levels the Signal Monitor will enter the fault mode causing the

Output relay contacts to close and enabling the Stop-Time output to the controller. See

Section 8.1.3.

210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 2

1.2.3 CONTROLLER WATCHDOG MONITORING (WDT ERROR)

Sensing of the controller Watchdog output is provided as specified in Section 4.3 of the

Caltrans Traffic Signal Control Equipment Specifications. When a logic transition is not

sensed for the specified period (see Section 8.2) the Signal Monitor will enter the fault

mode causing the Output relay contacts to close and enabling the Stop-Time output to the

controller.

The WDT Latch option (see Section 4.5.1) determines whether this WDT Error fault mode

is latched through an AC Line brownout or not. If the WDT Latch option is not selected, an

AC Line brownout condition will reset the WDT ERROR fault mode when the AC Line is

restored. The WDT Error indicator will remain illuminated until a Reset command is issued

via the front panel RESET button or External Reset input. This indicates to the technician

that a WDT Error occurred but was cleared by an AC Line brownout. If the WDT LATCH

option is selected, the WDT Error fault mode is maintained until a Reset command is

applied.

210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 3

Section 2

EXTENDED FEATURES

The following extended features are provided on the Signal Monitor to provide additional

fault monitoring functions, to increase the reliability of the monitor operation, and enhance

the diagnostic capabilities offered to the service technician.

2.1 HARDWARE FEATURES

The 210/2010/2018 series Signal Monitor is a dual microprocessor based unit. All

monitoring functions and features are firmware programmable that permits upgrades or

modifications by simply replacing the EPROM device containing the firmware with the

upgraded version. Thus, most changes to the Signal Monitor specifications may be

accommodated without modifying the hardware.

Since all critical timing functions are accomplished by the microprocessor, the quartz

crystal based accuracy results in very precise and repeatable measurements. This

accuracy is maintained on functions from timing fault conditions to implementing a unique

firmware based digital sampling and filtering algorithm. This algorithm is applied to all AC

field signals to help eliminate false detection in a "noisy" AC line environment.

Input voltages are measured using a true Root Mean Squared (RMS) technique. A

dedicated microprocessor RMS- Engine controls the analog to digital (A/D) hardware which

samples each AC input voltage 32 times per cycle. The RMS-Engine then calculates the

true RMS voltage value producing accurate results which are very insensitive to changes in

frequency, phase, wave shape, and distortion. Voltage references are temperature

compensated for constant voltage levels within the operating temperature range.

A nonvolatile EEPROM device is utilized to retain fault status information and event logs in

the event of an AC Line power interruption. The correct fault indications will be displayed

upon restoration of AC Line power. This EEPROM device requires no battery back-up. The

time of day in the model “ECL” model is stored in a battery-backed real time clock circuit.

Should this battery fail, only current time of day and date information will be lost. No

monitor configuration programming is stored under battery power.

2.2 RED FAILURE MONITORING

The Signal Monitor is designed to adapt Red Failure Monitoring to a conventional controller

cabinet assembly. The simultaneous absence of active Green, Yellow, and Red field signal

voltages on a channel places the Signal Monitor into the fault mode causing the Output

relay contacts to close and enabling the Stop-Time output to the controller. Sixteen Red

signal inputs, a Red Enable input, and two Special Function preemption inputs (SF1, SF2)

are connected to the monitor via a front panel connector (P1) and ribbon cable assembly.

Chassis Ground may also be connected to the unit through pin P1-4. Jumper E1 must then

be inserted to complete the connection.

The Red Fail fault timing value is selected by the Red Fail timing Option switch labeled RF

2010. See Section 4.4.1.

This monitoring function is enabled by applying AC+ to the Red Enable input (P1-20).

Unused Red signal inputs must be tied to AC+ to prevent a Red Failure on those channels.

Red Failure monitoring is disabled for all channels when the Red Enable input is not active,

a Preemption input (SF1, SF2) is active, or the EE input (MC Coil) is active.

2.2.1 RED FAIL SSM ENABLE

The Red Fail function can also be enabled on a per channel basis using the SSM switches.

If the “RF SSM” option switch is in the On position (Section 4.4.7), then each channel will

be monitored for a Red Fail condition if the corresponding SSM switch is in the On position.

210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 4

Red Failure monitoring is disabled for all channels when the Red Enable input is not active,

a Preemption input (SF1, SF2) is active, or the EE input (MC Coil) is active.

2.2.2 RED INTERFACE CABLE FAULT

When inserted into the output file without the Red Interface cable assembly, the Signal

Monitor will operate as a standard 210 Signal Monitor. The Red Fail, Dual Indication, and

Clearance monitoring functions will be disabled. When the Red Cable Fault select option is

installed (see Section 4.5.4), operating without the Red Interface cable will cause the Signal

Monitor to enter the fault mode causing the Output relay contacts to close and enabling the

Stop-Time output to the controller. To indicate this fault mode the Red Fail indicator will be

illuminated with all channel indicators Off.

The cabinet should be wired such that the Red Enable input is only interrupted by the Load

Switch bus being de-energized. Red Fail preemption control to the monitor should use the

Special Function inputs #1 or #2.

2.3 GYR-DUAL INDICATION MONITORING

This monitoring function detects simultaneous indications of active Green and Yellow,

Green and Red, or Yellow and Red field signal outputs on the same channel. A GYR-Dual

Indication fault places the Signal Monitor into the fault mode causing the Output relay

contacts to close and enabling the Stop-Time output to the controller. GYR-Dual Indication

Monitoring is enabled concurrently with Clearance Monitoring on a per channel basis using

the SSM switches (see Section 4.2) and requires the controller cabinet assembly to be

adapted for Red Signal Monitoring. GYR-Dual Indication Monitoring is disabled for all

channels when the Red Enable input is not active or the EE input (MC Coil) is active.

An open or no load condition (i.e., burned-out bulb) may be detected as an active signal

due to load switch leakage current and may cause a Dual Indication fault. Dual Indication

Monitoring may also anticipate a possible Conflict in the event that a proceed signal on a

channel is constantly detected as active.

2.3.1 GY-DUAL INDICATION MONITORING

This monitoring function detects a simultaneous indication of active Green and Yellow field

signal outputs on the same channel. A GY-Dual Indication fault places the Signal Monitor

into the fault mode causing the Output relay contacts to close and enabling the Stop-Time

output to the controller. It does not require the controller cabinet assembly to be adapted for

Red Signal Monitoring, and is enabled by setting option switch SW3-4 labeled GY ENABLE

in the ON position (see Section 4.4.4). GY-Dual Indication Monitoring may be enabled

concurrently with GYR-Dual Indication Monitoring. When GY-Dual Indication Monitoring is

enabled, all channels will be individually monitored for simultaneous indications of active

Green and Yellow field signal outputs. Any channels which have been selected for GYR-

Dual Indication Monitoring will function as described above in Section 2.3.

This monitoring function is intended to accommodate Green and Yellow Dual Indication

Monitoring on a five section PPLT signal head. It is also useful if the controller cabinet

assembly is not adapted for Red Signal Monitoring as in the case of a standard 210 Signal

Monitor.

2.4 CLEARANCE (SHORT OR ABSENT YELLOW) MONITORING

This function detects the absence of a minimum period of active Yellow field signal output

during a Green to Yellow to Red sequence. Clearance (Sequence) Monitoring is enabled

concurrently with GYR-Dual Indication Monitoring on a per channel basis using the SSM

switches (see Section 4.2) and requires the controller cabinet assembly to be adapted for

Red Signal Monitoring. Clearance Monitoring is disabled for all channels when the Red

Enable input is not active or the EE input (MC Coil) is active.

210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 5

A Clearance (short or absent Yellow) fault condition will place the Signal Monitor into the

fault mode causing the Output relay contacts to close and enabling the Stop-Time output to

the controller. This occurs when a Red input signal to a channel is active following the

termination of an active Yellow input signal which is less than the minimum duration,

including zero (i.e. skipped).

2.5 AC LINE BROWN-OUT DETECTION

When the AC Line voltage is below the "drop-out" level the Signal Monitor will suspend all

fault monitoring functions, close the Output relay contacts, and enable the Stop-Time

output to the controller. The AC POWER indicator on the front panel will flash at a rate of

2Hz to indicate the brown-out status. When the AC Line voltage returns above the

"restore" level the monitor will resume normal operation and the AC POWER indicator on

the front panel will remain illuminated.

The AC Brownout dropout and restore voltage levels are selected by the AC Line Brown-

out Select jumper labeled SEL5. See Section 4.5.5.

AC Line Brown-out Detection is provided to prevent a dark intersection in the event a

brown-out causes the cabinet controller to release control of the intersection. If this occurs

and the intersection is not placed into flash, the monitor will detect a Red Failure (absence

of signal) or WDT Error and will require a manual reset. The "low AC Line Voltage" level

on the Controller Unit should be set at least 5 volts below the monitor drop-out level.

2.5.1 MINIMUM FLASH TIME

A Minimum Flash time option can be selected (see Section 4.5.2) which provides a flash

interval of at least 6 seconds and at most 10 seconds in duration following a power-up, an

AC Line interruption, or a brownout restore. During this interval the unit will suspend all fault

monitoring functions and close the Output relay contacts. The AC indicator on the front

panel will flash at a rate of 4Hz.

The minimum flash interval will be terminated after at least 6 seconds if the Watchdog input

has made 5 transitions between the True and False state and the AC Line voltage is

greater than the restore level.

2.6 LEDGUARD®LED FIELD SIGNAL SENSING

The Signal Monitor can be configured to use a technique called LEDguard®that is designed

to better monitor the characteristics of LED based signal loads (See Section 4.4.6). Each

field signal input is measured and compared to both a high threshold and a low threshold

value to determine On / Off status. This differs from conventional operation where the

active threshold is picked according to the color of the field signal. Once the high and low

On / Off thresholds (Section 8.1.2) have been determined using the input RMS voltage, the

individual fault monitor functions use the appropriate threshold to determine if a fault

condition exists.

LEDguard®

Green/Walk

Yellow

Red/Dont Walk

Conflict

Low

---

Red Fail

High

Dual Indication

Low

Clearance

Low

High

2.7 RECURRENT PULSE DETECTION

This error detection function supplements the normal Conflict, Dual Indication, and Red Fail

monitoring algorithms for sensing faults that are intermittent or pulsing in nature. The RMS-

Engine is designed to filter out short term transients commonly found on the electrical

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