Centralized Traffic Control System Proray SCADA
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Centralized traffic control system allows to solve the tasks of centralized control in operation traffic control centers. The system increases the level of transportation process automation, possesses self-diagnostics elements, helps to control staff actions, controls technical facility operation, track, rolling stock and power service equipment conditions.
Centralized traffic control system is a modern and extensive system that can be integrated with any type of electric interlocking including electric interlocking of block type. It can be easily adapt to the conditions of a certain control range both at the design stage and at the stage of its modernization during the operation.
Centralized traffic control system implements modern principles of operation control. It is intended to provide required carrying capacity of railways as well as safety movement at centralized control by the interlocking devices at the stations and station-to-station blocks.
Centralized traffic control system is designed and implemented on the objects of railway control to:
- Increase the reliability of interlocking system devices;
- Provide flexibility of carrying capacity control of the controlled areas;
- Control the equipment parameters on the controlled areas;
- Interconnect with already existing systems;
- Decrease the power consumption of the control equipment;
- Make operation and maintenance easier.
The system, we offer, is a complex solution for the tasks connected with railway transport control and associated infrastructure.
The system performs the following functions:
- Collecting, analyzing and displaying primary discrete and analogue signals from different devices via different communication channels and protocols.
- Forming the integral signals.
- Remote control of the equipment from the operator’s working place.
- Recording the history of system conditions including values of integral signals, emergencies and control.
- System scaling.
SYSTEM COMPONENTS DESCRIPTION
Data server gathers data from device drivers and group them according to the given criteria. Asking occasionally the device state, data server stores the set of signal current physical state. Primary signal can be:
- One-bit discrete (states 0 or 1);
- Multi-bit discrete (n class, 2n states);
- Digital analogue signal with n class.
Given signals are described in central data base configuration and are grouped according to their actual belonging to any device. Every physical signal can be classified according to the access type:
- only reading
- reading and recording
- only recording.
With exception of primary physical signals, the system allows to input integral signals. Integral signals are signals of any primary signal type stated above. Their states are calculated by the logic server according to the analyze of some set of primary physical signals. The example of using such signals is state signals. Integral signals extend the range of possible signal types allowing to transmit text data as well.
Data server and logic server configuration is carried out in special design environment PRORAY and is stored in central data base. Configuring is carried out by the operator according to the devices and signals of equipment configuration project and taking into consideration requirements of these signals visualization.
Control in terms of PRORAY SCADA system is performed as transmitting of definite signals to the physical control devices. Control is carried out from clients terminals of the system. The system allows to exclude access conflict to one control object from different users. This function is called control focus. Before operator sends a command, he should capture control focus for a given model. If control focus wasn’t captured he comes to the operator who requested it. Operator who has certain privileges can capture the control focus from less privileged operator.
Signals state visualization is performed by displaying special graphic models on the video monitors. The model is a complex of graphic objects (geometric primitives, text symbols and different pixel images) grouped according to the given requirements. Each graphic object is associated with one or several signals and its functioning is set according to the signals it is associated with. Controlled signals are performed on the model by graphic control elements such as buttons and switches.
Graphic module of the PRORAY SCADA system uses capabilities of the OpenGL hardware acceleration and provides simultaneous displaying of more than thousand separate signals as well as smooth animation on the graphic accelerators. Using of any formats of pixel images with Alpha–channel (bmp, jpeg, png, tif, etc.) The system supports all possible configurations and resolutions of video monitors. The number of models is unlimited.
Models are formed in RAD environment of PRORAY SCADA system. The system supports quick visual designing. Models configuration is stored both as separate files and in central data base.
The system allows to delimit access level to the models for reading and control for any user.
Access control system
PRORAY SCADA system supports setting of access levels to the displayed information, control and administering of the system.
The system allows to input unlimited number of users and set certain number of privileges personally to each user.
It is impossible to disclose user’s password because only message digests are stored in central data base. During the process of identity check data between the users and the server are encrypted using encrypting asymmetric algorithm RSA with setting key size from 512 to 2048 bit.
PRORAY SCADA system allows to record state changing history of physical and integral signals. After receiving the changes of any signal data server and logic server form relevant recording changes. These records stored the information of how, in what way and when the signal has changed. Than these records are cached by the service of history collection, grouped and sent to the data base server, where they are inserted in to the specially indexed tables for quick search. Disc space is saved by recording only certain signals but not snapshots. Signal state control is also recorded into the history.
User’s terminal allows to display changes history. The user sees the changes happened in the past as well as current changes through the displaying model. There is no discrepancy of signals between the past and the current states.
ADVANTAGES OF IMPLEMENTATION
Adaptability. Centralized traffic control system is a modern and extensive system that can be integrated with any type of electric interlocking including electric interlocking of block type. It can be easily adapt to the conditions of a certain control range both at the design stage and at the stage of its modernization during the operation.
Up-to-dateness. The system provides implementation of modern principles of operation control for the required carrying capacity of the railway and traffic safety at centralized traffic control at the stations and station-to-station blocks.
Increasing of informational content and reliability by means of using micro-processor based systems as controlling system that provides more detailed information about the state of devices with capability of its archiving.
Scaling means of visualization that allow to use configurable video panels of any dimension.
Operational economy optimization of the maintenance staff work using modern technical facilities with high reliability factor and long-lasting operating life and decreasing of power consumption.
Reduction of capital investments by means of using universal solutions, reduction of space for equipment, cutting the terms of designing, building and start-up and commissioning works.