Busan subway Line 3 Signaling system
Busan subway Line 3 Signaling system
Overview
Line 1On November 28, 2005, Busan subway Line 3 was opened
for urban traffic, thus connecting the section of about 20
km between Suyeong Station in Busan (Korea's second
largest city) and Daejeo Station (depot).
The signaling system used for this line mainly consists ofATP equipment using digital signals to shorten theoperating time, improve riding comfort, and provide
complete support information for drivers (previous noticesignal for forward track circuit, next station arrival platform
No. information, etc.).

Hopo

Nopo-dongLine 3Daejeo

ATP digital signals sent from wayside equipment can beused to generate an optimum train control pattern forpreceding train position on on-board equipment. ATO
equipment controls train operation between stations. At
each terminal station, an auto turn-back function (ATB) thatenables automatic turn-back operation is provided.

Line 2

Duckcheon

Seoul

DongnaeBusan

SinpyeongSeomyeon

Suyeong

JangsanBusan Subway Network

Overview of the line
Length of the line

Approx. 20 km

Operation headway

150 sec.

No. of stations

17 stations + depot

Max. operating speed

80km/hNo. of operating train

20 trains

Operation method

Single-person operation

Train formation

4 vehicles / 1 train

The signaling system mainly consists ofSINPL ATP equipment using digital signals.
SINPL : Simple , INtegrated & ParalleL

12

System configuration
System configuration
There are seven signal equipment rooms at six interlocking
stations and one centralized station. Each interlocking station
is provided with ATP/TD equipment, EIE equipment, andATO/TWC equipment; the centralized station is provided withATP/TD equipment and ATO/TWC equipment.

The on-site ATP/TD and ATO equipment consists of a rail tosend and receive ATP/TD signals, the MT box to match thesignal equipment, and ATO markers for ATO distancecorrection and other functions in a simple configuration.

and then connected to the TTC equipment in the Operation
Control Center.
The ATP/TD equipment transmits information to the on-board
equipment via an on-site MT box and track circuit . The ATO
equipment sends and receives bidirectional information to andfrom the on-board equipment via on-site TWC equipment andthe wayside TWC antenna.

The ATP rack, TD rack, EIE rack, and LDTS I/F rack equipped ineach signal equipment room are connected to each rack via afail-safe LAN and the section between equipment isconnected without relays. The LDTS connected to the LDTS
I/F rack is transmitted to the CDTS via the Ethernet and LAN,

ATP : Automatic Train Protection

MC: Maintenance Console

TD: Train Detection

FT/OTMT: Matching Transformer: Fuse Terminal /Output Terminal

TTC: Total Traffic Control

CDTS: Central Data
Transmission System

LDTS: Local Data
Transmission SystemATO : Automatic Train Operation
TWC : Train Wayside Communication
PSD : Platform Screen Door

Operation Control Center
The EIE equipment is connected to the on-site switch machineand signal equipment through the ET rack to exert control.

TTC

EIE

: Electronic Interlocking
Equipment

ET: Electronic Terminal

LDTS I/F : Local Data Transmission
System Interface

LCC : Local Control Console

CDTS

LAN

Ethernet

Ethernet

Interlocking station

Centralized station

LDTS

For adjacentintermediate station

LDTS

For adjacentintermediate station
ATO/TWC rack

LDTS
I/F rack

LCC
ATO/TWC rackMC

MC
LDTS I/F rack
ATO/TWC rack

ATO/TWC rack
Fail-safe LAN

PSD

Fail-safe LAN

LCC

PSD
TD rack

ATP rack

PSDPSDEIE rack

ATP rack

TD rack

ET rack

MT rack

MT rack

FT/OT rack

Signal equipment room

Signal equipment room

MT box
TWCequipment

ATO marker
P1

3P2

P3

P1

MT boxTWC
equipment

Switchmachine

ATO marker
Wayside TWC
antenna

MT boxTWC
equipment

P2

P3

Wayside TWC
antenna

Signal ATO marker
equipment
P1

Track circuit

P2

MT boxTWC
equipment

ATO marker
Optical fiber cable
P3 Wayside TWC
antenna

P1

P2

P3

Wayside TWC
antenna

Metal cable
Track circuit4

ATP/TD （Automatic Train Protection / Train Det ection）
ATP TD （AutomaticAutomatic Train Protection / Train Detec tion）
tion
ATP/TD
Improving functions through the digitization of ATP signals
The train control system mainly consists of ATP equipment using digital signals to shorten the operating time, improveriding comfort, and provide complete support information for drivers (previous notice signal for forward track circuit, next
station arrival platform No. information, etc.).
This ATP equipment is based on the SINPL series that monitors the track circuit that has been delivered to accommodate
more than 4000 tracks.

Configuration of ATP/TD equipment
The on-board equipment is applicable to LRT system, provided that the ATP receiver is replaced by an on-board antenna.

Maintenanceinformationprocessor

SINPL : Simple , INtegrated & ParalleL

Interlocking
logic unit

Electronic
terminal

Electronic
terminal

Electronic
terminal

TD rack
TR condition
Maintenance information

SINPL is intended to improve cost performance by adopting a Simple method/configuration with Integrated functions installed andmulti-track ParalleL send/receive processing implemented.
Fail-safe LAN
TR condition
Route control condition

Reduction of equipment accommodation space
Reduction of equipment and work expenses

ATP reaction condition
Maintenance information

Configuration of ATP processing equipment

Improvement of maintainability

Features of the ATP/TD equipment-LA
N
I/F

ATP of digital signaling system

BU
S
Ｉ

I/F

C
P
U

B
US
Ｉ

I/F

M
O
D

1/2T

A
M
P

3/4T

16台

B
U
S

The ATP code of the main line is pattern-controlled at 5 to 80 km/h

A
M
P

Ｉ

I/F

A
M
P

Pattern control protects against overruns, thus reducing overrun length
The previous notice signal for forward track circuit and the next station arrival platform No. aredisplayed on the operating panel

31/32T

A/DProcessor

1 unitFor equipment-to-equipment connection, we adopt a high-reliability, high-speed optical LAN thathas been actually used
ATP rack

Cab signal indication at shunting

Units are added in accordance with the No. of track circuits
ATPcontroller
ATP on-boardequipment

In an emergency, pressing a button in the station or Operation Control Center can stop a train

Brake control
circuitMT boxExample of ATP bit format
The ATP signal wave is generated by MSK modulation and the frame information consists of 36 bits. This bit allocation is applicable
to a train control system using digital ATP and to next-generation train control systems.
MSK : minimum shift keying
123456789ATP signal(Signal transmission)

ATP receiver

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Track circuit

Start flag

5Order No.

Information
type

Aspect information

Running
direction

Previous notice
information

Reserve

CRC

6ATO/TWC（Automatic Train Operation / Train Wayside Communication）
ATO/ TWC（AutomaticATO/TWC
Automatic Train Operation / Train W ayside Communication）
Communication
Performs automatic operation control safely and precisely for train operationThe ATO/TWC equipment operates trains automatically without operator intervention, thus enabling driverless operation orsingle-person operation. For driverless operation, all operations ranging from starting up the train power to train arrival ata station, and including the opening and closing of train doors and the PSD (Platform Screen Door), are automaticallycontrolled. For single-person operation, fixed-position stop control and controlling the opening and closing of train doors
and the PSD at a station are performed through a man-machine interface.
The trains on Busan subway Line 3 are usually run through single-person operation, but use of this equipment also permits
driverless operation.

Configuration of ATO/TWC equipment
The ATO/TWC equipment consists of wayside equipment and onboard equipment. ATO markers P1 to P3 are wayside equipmentused for distance correction for fixed-position stop control, forwhich the distance correction information of the ATO markers istransmitted to the train. The bidirectional transmission ofinformation is performed between the wayside TWC antenna andon-board TWC antenna.
Train control information and PSD display information aretransmitted from the wayside TWC antenna to the on-boardantenna.

Functions of the ATO/TWC equipment

Train display information and PSD control information aretransmitted from the on-board TWC antenna to the wayside TWC
antenna. Information is also exchanged with the PSD.
The 3.0 MHz band is used for transmitting information from theon-board TWC antenna to the wayside TWC antenna; the 1.7 MHzband is used for transmitting information from the wayside TWC
antenna to the on-board TWC antenna. FSK modulation is used as
the modulation system. The on-board TWC antenna always
transmits an unmodulated wave of 256 kHz (power wave) tosupply ATO marker driving power.

Automatic operation : Accelerates or decelerates the train according to the target speed

FSK : frequency shift keying

Fixed-position stop control : Controls braking so that the train can stop at the fixed position
Train power circuit

Door open/close control : Controls the opening and closing of train doors and the PSD after the train stops

On-board
ATO/TWCequipment

Brake control circuit

LDTS I/F rack

ATO/TWC rack

PSD
Door
equipment
External
equipment

On-board
TWC antenna

TGFeatures of the ATO/TWC equipment
The accuracy of fixed-position stop control is 350 mm or less.
PSD control is matched to each mode upon switching between Open Auto/Close Auto, Open Auto/Close Manual, and OpenManual/Close Manual at the driver's discretion.

P1

P2
ATO marker

P3

WaysideTWC antenna
TWC equipment

This equipment is applicable to ATB (Auto Turn Back) mode in which driverless train shunting is performed on the draw-back track.
If operation failure occurs, this equipment can change the running direction from train stop status at the originating or destination
station to enable operation to resume under PSD control and through ATO operation. This is called STB (Station Turn Back) mode.

Station-to-station running pattern under driverless operation

Wayside TWC antenna

ATO/TWC rack

control speed, with train power control, fixed speed operation, and fixed-position stop control performed based on this target speed.
ATO target speed Vp
Stop pattern
ATP control speed

Train speed Vv
Fixed-position control starting point

Vp＋2km/h
Vp−2km/h
Residual distance correcting point

Fixed speed control
Acceleration relief
pattern control

ATO marker

Residual distance correcting point

Fixed speed control
Deceleration control

All-train power control
Target stop position
P1Platform7P2 P3 P4Platform

P1 to P3 : ATO marker
P4 : Wayside TWC antenna8

EIE（Electronic Interlocking Equipment）
EIE（ElectronicElectronic Interlocking Equipment）
Equipment
Overview of the EIE equipment（Local Data Transmission System I/F）LDTS I/F
LDTS I/F（LocalLocal Data Transmission System I/F）
I
Overview of the LDTS I/F equipment

The EIE equipment is interlocking equipment provided with a fail-safe function, and consists of electronic units. This equipment
installed in the signal equipment rooms provided at five interlocking stations and one depot to control the switch machine andsignal equipment in the interlocking stations.
The PC-type control panel or LCC (Local Control Console) is connected to the EIE logicunit for performing route control and point control. The LCC is connected to theATO/TWC equipment from the EIE logic unit via the fail-safe LAN and then the LDTS I/F
for performing train control.

The LDTS I/F equipment serves as an interface connecting the central TTC andeach unit of signal equipment, and consists of the same hardware as that of thelogic unit of electronic interlocking equipment. Accordingly, this equipment
creates LDTS I/F logic by using the LDC just like that of the EIE logic unit.
The LDTS I/F equipment is connected to each unit of equipment (ATP/TD and EIEequipment) having a fail-safe function connected to the fail-safe LAN, andperforms relay transmission using non-fail equipment (ATO/TWC and LDTSequipment).

The EIE logic unit receives track circuit (TD) information from the TD equipment via thefail-safe LAN. The ATP transmission code information created from the TD information
and route control information by the connecting type of LDC (Logical Data Compiler) isoutput to the ATP equipment via the fail-safe LAN.

Related equipment

Features of the EIE equipment
As high-safety and high-reliability electronic interlocking equipment, the electronicinterlocking equipment of the K5B series that has already been put to practical use isadopted.
The interlocking logic function is created with a relay connecting-type image by using
the LDC (Logical Data Compiler).

TTC equipment（TotalTotal Traffic Control）
Control
EIE rack

Connecting between the ATP/TD equipment and EIE logic unit via the fail-safe LAN
increases processing speed and improves the sharing of data, unlike the existingrelay type of contact.

Installed in the Operation Control Center to perform route control
and train control based on the diagrams and operation control forthe entire line.

CDTS equipment
Central Data Transmission System）
System（CentralLDC (Logical Data Compiler)
The LDC is a software design tool that allows the designer to create the interlocking logic on a Boolean logic basis, which iseasily interchangeable with relay circuit diagrams as to logic expression. In addition, the LDC is outfitted with an automatic datacomparison feature that identifies modified portions of the logic on the display for easy verification of the modified design.

Installed in the Operation Control Center to perform relay operations
between the LDTS of each signal equipment room and the TTCequipment.

LDTS equipment
Local Data Transmission System）
System（LocalTransmits route control information from the TTC equipment to the EIE
equipment and train control information to the ATO/TWC equipment.
Also outputs display information from each unit of signal equipment tothe TTC equipment. Should the TTC equipment fails, train control canbe performed from the LDTS equipment in the same way as by theTTC equipment.
LDC Diagram

Relay Library

MC equipment（MaintenanceMaintenance Control）
Control

Supply records

Performs maintenance for the entire system connected to the failsafe LAN, and also monitors the fail-safe LAN itself.

The K5B series has been actually supplied at least 300 domestic stations and 200 overseas stations.

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