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CBI system MPTc

1.     CBI system MPTc-2

SBI system of interlocking and signals on the basis of the computer control system UVK ETcM (MPTc-2) is used for station process control. It performs real-time data collection, processing and storage of information about the current state of EI sites. Based on retrieved information processing algorithms of centralized management station facilities of field and local automatic with formation and control actions outputting are implemented. Thereby the basic tasks of installing routes, their closure, the subsequent sectional route release as the rolling stock progress on the route, route or individual switching of points and their extreme positions control, traditional problems of EI are solved.


1.1     MPTc-2 system functions

Along with these traditional tasks MPTc-2 system performs the following tasks that does not seem possible to be solved in ladder logic systems:

  • Logical control of training paths and track sections by routing procedure and their subsequent clearing to exclude the possibility of opening a colour light signal on the false vacant (loss of shunt) track or track section.
  • The possibility of opening an call-on signal only when route assignment with testing of all safety conditions except excluded station duty officer at own risk (including position points control) as well as checking all the security conditions are not taken when burning call-on signal. It improves traffic safety in case of wayside devices (track circuits and points) and decreases in these case psychological stress on station duty officer.
  • Termination of encoding routes under unauthorized departure of running unit on the route.
  • Testing the vacancy of all sections in shunting route when driving the cars ahead of the entry running unit on the route except for the first section adjacent to busy)
  • Section route release exception when running unit passing stop aspect of  colour light signal
  • The possibility to set the auto mode of action in any train route
  • Individual time delay for each open colour light signal
  • Individual countdown the time delay for each cancel route, opening section, etc.
  • Issue, where necessary, text messaging (based on analysis of the current technological situation) on the PC screen of LCI
  • Issue, where necessary, sound and voice messages
  • Recording of the entire process (archiving) with the possibility of both subsequent decryption in text form and the subsequent in the animation mode.


1.2       MPTc-2 system structure

According to the location of equipment MPTc-2 system is centralized: computer control system UVK ETcM, relay and cross rack are on EI tower. Of relay equipment stored only point starter unit, relay equipment of track circuits and electrical switching of colour light signal lamps.

The MPTc-2 system includes:

  1. UVK ETcM
  2. LCI
  3. FEU, coordinate device (KSU)
  4. Relay equipment, analog signals measuring equipment.

Figure 1 shows a structural diagram of the MPTc-2 system.

Main control and monitoring functions are implemented in a computer module that constituent in UVK ETcM cabinet. LCI contains three PCs. During system operation, the first PC is in mode of working, the second is mode of hot standby, and the third is mode of cold standby. For large management areas station division allows into control zones with definition of independent sets of management and control for each zone.

At the organization of interaction of MPTc-2 system with upstream system KSU is used. It is connected with all PCs of LCI.

MPTc-2 system is designed in compliance with all principles of modern system of EI. At the same time both tasks of management and control workplace, and functional tasks of points and signals centralization are implemented by means of computer technology to ensure the security. The equipment can be located in existing buildings as well as in specialized container modules.

If necessary, explanatory report about management process results can be issued to station duty officer. Simultaneously constant diagnosis of system condition is performed with formation and rapid transfer of information to LCI PC for display the status of EI objects and results of microprocessing system means diagnosing.

Centralized control on the basis of UVK ETcM is provided with possibility of combining EI functions, telecommunication with object and with operational and technological personnel (LCI, FEU, etc.) in one complex. Establishment of  UVM ETcM communication with control and management objects provide up to 30 control digital inputs per single input unit and up to 16 control digital outputs per single output unit. The total number of duplicate input and output units to a single cabinet is 60 units, to two cabinets is 180 units, which is 1080 digital inputs and 864 digital outputs at two-cabinet design of UVK ETcM. UVK ETcM power is not less than two single-phase AC inputs (switched out of UVK ETcM) with a nominal voltage 220 V power frequency through the UPS system, which is comprised in UVK ETcM.

Figure 1.  Structural diagram of the MPTc-2 system

Figure 1.  Structural diagram of the MPTc-2 system



1.3     Computer control system UVK ETcM

Control computer system UVK ETcM-2 is the system MPTc-2 core and it is designed to points and signals control in the EI.

UVK ETcM was created based on technical requirements with the modern design method use of fail-safe devices and was tested by specialists from PGUPS, October railway. In operation the UVK ETcM implements the control and central dependencies algorithms of points and signals with ensure the necessary security conditions.

Under the UVK ETcM design the most modern construction methods were used, such as network technologies.  UVK ETcM is distributed computer system connected to the local network.  Connecting to bridging devices with objects is implemented through two two-wire communication lines (CL). The first line provides connecting with main bridge devises, the second – with backup bridge devices.  This structure has significantly increase the stability of system work. It has been confirmed in the operating tests.

In the first stage of system direct control of object (colour light signals, points, and track circuits) is implemented with relay-contact devices, which are controls with output devices (bridge devices) of UVK ETcM. UVK ETcM has triplex compute kernel (CK).

UVK ETcM is made in closed cabinet, equipped with locks. External ports and interface connectors for connecting and switching are absent. The cabinet doors are equipped with anti-tamper switch, information from which is constantly transmitted to LCI and KSU. Two RS-422 interface are used to communicate with each LCI. Communication is carried out with specialized protocol with encoding and checksums.

To ensure the reliability the power system of UVK ETcM is backuped and it has inboard non-switchable (ON LINE) UPS device.

The system blocks of LCI are in the duty room o the station.  Installation is made in a separate cabinet, equipped with locking devices and locks. Computer cabinets are sealed. Connection of removable media and other devices without opening the seal is impossible (all available ports to connect are physically disabled).

Switching of signal and power supply cables are made closed. Cable access without opening the seals and/or without opening the locks is impossible.

Connection to KSU is implemented through RS-422 interface which works only for transmission of information. Communication is carried out with specialized protocol with encoding and checksums.

Windows XP Professional is used as operating system of LCI computer. The user account of the Administrators group is protected with password and hidden. Special account with limited rights is used to dispatcher work. Loading is carried out with an automatic logon under a special account and automatically start of LCI software. Program exiting is impossible without rebooting the system. Other application running is possible. Unnecessary services, applications and drivers are removed or disabled.

Figure 2 shows a structural diagram of UVK ETcM.


Figure 2. Structural diagram of UVK ETcM

Figure 2. Structural diagram of UVK ETcM


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