With the rapid development of high-speed trains and urban light rail lines, the maintenance work of depots has become increasingly complex and busy. In order to prevent work-related accidents or serious equipment losses, a safety interlocking system based on the concept of interlocking control in the railway industry emerges as the times require. Usually, the safety interlock system consists of the access control subsystem to ensure the personal safety of the platform’s top operators, the vehicle in and out signal and warning subsystem, the electrical interlock control subsystem to protect the safety of the equipment, the PLC network control subsystem, and the computer control subsystem. Subsystem and video surveillance subsystem.
2 System Architecture
With the continuous improvement of industrial control automation and the wide application of computers in the industrial field, users make more use of the human-machine interface of the computer to understand information and operate more intuitively and quickly. The power control monitoring configuration software has the overall openness, engineers can expand the system based on the product, and develop their own application system through the open interface. interface that precisely meets actual needs.
The safety interlocking system of the EMU uses the PLC master station of the dispatching room and the PLC substation of each lane to communicate through the network composed of CC-LINK lines, so as to control the signal lights, Display screens, flashing lights and other equipment in the system , and transmit these information to the power control monitoring configuration software of the computer through the I/O Driver of the PLC main station, so that the operator can operate on the computer interface intuitively.
The access control subsystem is equipped with a special access control controller, which is installed in each inspection warehouse. The data is transmitted to the access control master controller through a special line, and all access control data can be displayed in the special access control computer. At the same time, the PLC master station can retrieve the data of the access control master controller and upload it to the force control monitoring configuration software to display the status of each access control in real time.
The video monitoring system is independently set up, and the real-time image of the camera is transmitted to the video server in the dispatching room through the hard disk video recorder to realize the real-time image monitoring of each maintenance section. Figure 1 shows the system architecture diagram.
2.1 Application of vehicle in and out system
The dispatching control of the EMU is divided into two parts: the section dispatching center and the dispatching room in the depot. The force control monitoring configuration software greatly reduces the configuration workload through its convenient and friendly development environment and object-oriented design. In the screen, according to the requirements of the vehicle in and out storage system, the status of entering and exiting parking spaces inside and outside the library, the status of the isolation switch, the status of each signal light, and the status of various alarms can be dynamically displayed according to different inspection warehouses and different lanes. The color of the picture is vivid, and the animation effect is real and smooth, so that the on-site engineers can intuitively understand the real-time status of vehicles entering and leaving the warehouse.
2.2 Application of Access Control System
In the safety monitoring system of the EMU, the electromagnetic lock in the access control subsystem is controlled by the access control computer in the dispatching room. The data of the access control system can be aggregated to the power control monitoring configuration software platform through the PLC terminal at the same time, which can display the access control card number of the vehicle personnel entering and leaving the warehouse in real time, and generate various work log reports, which provides powerful data support for future data aggregation and analysis. .
2.3 Application of computer and PLC network control subsystem
This control mode, which combines PLC network control system and force control configuration software, has the following characteristics:
(1) Convenience: The network control system composed of PLC collects, logically calculates and outputs industrial field data, integrates the system with flexible and diverse “configuration methods”, and simplifies the various preset software modules. It can realize and complete various functions of the monitoring layer very easily, shorten the system integration time of automation engineers, and greatly improve the integration efficiency.
(2) Intuitiveness: The functions of the safety interlocking system, such as the state of the train entering the warehouse, the signal lights, the presence or absence of electricity on the catenary, the gate signal and the strobe lights, are comprehensively reflected in the control interface of the force control configuration software in the form of pictures or animations. superior. At the same time, the status display bars and operation buttons of various workstations are arranged in an orderly manner below the control interface. System status prompts and control operations can be performed on the same interface. Figure 2 shows the safety interlock system control interface.
(3) Scalability: when the site (including hardware equipment or system structure) or user requirements change, software updates and upgrades can be easily completed without many modifications. At the same time, the force control monitoring configuration software supports remote deployment, can modify parameters online, is suitable for multi-person collaborative development, builds typical distributed applications, and can simultaneously build various application modes such as history station, event server, and alarm server.
(4) Ease of maintenance: the whole system is easy to maintain and upgrade, and the force control monitoring configuration software reserves data interaction interface, which can provide real-time data for the data platform of the higher-level dispatch center, so as to easily build the whole province and even the whole country. Segment Security Systems Data Center.
With the continuous development of high-speed railway and urban rail transit, safety interlocking system will be more and more widely used. When designing the safety interlocking system, the layout of the system should be reasonably considered according to the requirements of the user. At the same time, the complexity of the logical relationship of the control equipment should be minimized, the reliability of the control system should be improved, and the procurement equipment and installation engineering should be taken into account. economical.