|
 |
| |
 |
 |
![]() |
| |
|
|
| |
 |
|
| |
Project Name |
|
| |
Signal Control System for Subway No. 1 |
| |
Application |
|
| |
Transportation Automation |
| |
Moxa Products |
|
| |
EDS-508-SS-SC
MOXA SNMP OPC Server |
| |
Company Name |
|
| |
Beijing
DaCheng Signal & Communication Co.,
Ltd. |
|
|
|
Introduction
Subway No. 1 from Liuyuan to Shuanglin has a total length of just over 26 km,
including almost 14 km underground. The subway has 23 stations, one train-distribution
center, one train storage area, and a distribution control center. The trains
use 750 VDC third-track power. To give you an idea of the complexity of the
system, there are 4 bulk substations, 6 propulsion power substations, and 3
voltage-reduction substations, with signals transmitted by an ATP, ATS system.
The trains are domestic and DC voltage powered. With a total of 156 trains,
waiting time is only 2 minutes between shuttles, while serving 48,100 passengers
each hour.
A subway system has many different sub-systems, including Environment Monitoring
Control System (EMCS), Fire Alarm System (FAS), Fire Extinguisher System (FES),
Supervisor Control And Data Acquisition (SCADA), Automatic Fair Collection (AFC),
and Distributed Supervisor System (DSS). DSS is the most important of these.
The core of DSS is the link system on the railway. The reliability, security,
stability, and immediacy affect railway safety.
From a technical aspect, the signal system for the railway is a computer link
system, which is a combination of the mechanical link system and
electrical link system (relay link system). Due to the unreliability of the computer
link
system,
the devices must be highly reliable. In particular, the network system must
have redundant and interference-free functions. What kind of network system has
such functions? |
| |
System Description
The signal collection and link devices use equipment
from the British company, Westinghouse. The company
is well-known around the world for producing
reliable and stable devices. In the subway, eight
out of twenty one stations are equipped with
WOC signal collection devices, and four out of
these eight stations have two signal link devices.
WOC and link devices are used for signal collection
and on-site control, respectively. The highly
reliable front-signal-link-devices must be connected
in a safe and reliable network system to communicate
with each other. In addition, the system needs
devices with a wider bandwidth to achieve efficient
communication and immediacy when collecting signals
for distribution. The media redundancy, 260,000H
MTBF, and 148,800 pps forwarding and filtering
rate of Moxa EDS-508-SS-SC can satisfy the system's
critical requirements. |
| |
| System Block Diagram |
|
| |
Moxa Provides the Following Benefits
 |
Moxa Turbo Ring supports fast media redundancy (under 300 ms) to activate the backup path, helping to ensure the security of the network system. |
| |
|
In addition to configuring and managing EDS-508-SS-SC over the web, engineers can also monitor port status by SNMP-OPC Server. |
| |
|
EDS-508-SS-SC is equipped with signal mode fiber ports and can communicate end to end over a distance of 15 km. |
| |
|
The non-fan
and low-power design ensures a 260,000
hour MTBF for EDS-508 series. |
| |
|
EDS-508 series has an automatic warning function that operates by email and relay outputs. |
|
| Key Products |
| EDS-508-SS-SC |
 |
 |
Fast network redundant ring |
|
Port Trunking, VLAN, QoS, and IGMP Snooping for optimal network performance |
|
E-mail notification by exception |
|
-40 to 75°C operating temp. range |
|
SNMP OPC Server Pro easily integrate |
| |
* The EDS-508-SS-SC was upgraded to the EDS-508A-MM-SC. |
|
| |
| MOXA SNMP OPC Server Pro |
 |
|
Real-time management for any SNMP
device |
|
Monitor the network from a central location |
|
Easily create and edit the configuration
of
connected devices |
| |
|
| |
|
| |
|
|
| |
|
|
