The scheme of integrated monitoring system fully considers the high reliability requirements of rail transit monitoring, especially considering that after adopting integrated monitoring mode, the operation and maintenance of rail transit professional systems should be carried out on the same system, which requires higher reliability of the system. Therefore, the redundancy mechanism adopted in the scheme involves between central active and standby real-time servers, central active and standby historical servers, station active and standby real-time servers, station active and standby workstations, station active and standby FEP, central LAN dual networks and station LAN dual networks. Not only the hardware equipment, but also the corresponding software, including not only the running function, but also the data flow, are redundant. The multiple redundancy mechanism makes the system not affect the operation of ISCS in any single point failure and cross failure. Redundantly configured center and station servers operate in cluster mode (devices are not divided into active and standby, and the load is balanced, only task modules distinguish between on-duty and standby), and redundantly configured switches and FEP devices operate in active and standby mode (devices distinguish between on-duty and standby).
The detailed hardware structure is as follows:
First floor: The first floor of the central integrated monitoring system includes redundant real-time servers, redundant historical servers, external disk arrays, tape drives, various dispatching workstations (such as power dispatching, environmental dispatching, line dispatching, three-dimensional dispatching and general dispatching), NMS workstations, event printers, report printers, color graphic printers, redundant network switches with routing functions, FEP, large-screen systems (OPS), UPS, etc.
The network switch configured by OCC realizes the interconnection of all network resources of OCC. The selection of port number and bandwidth of the switch should fully consider the requirements of ISCS and network communication equipment, and the network switch is directly connected to the communication transmission network.
Under normal circumstances, OCC dispatcher controls and monitors the integrated system through the dispatcher workstation. OCC command is sent to the integrated system through ISCS network.
The main function of the real-time server is to complete the collection and processing of real-time data, and send control commands such as mode, program control or point control from OCC to the integrated system distributed in each station.
The main function of the history server is to store, record and manage historical data.
Second floor: comprehensive monitoring system at station level.
The second layer includes redundant real-time server, webmaster workstation, redundant network switch, FEP, IBP and UPS.
Disc, like SICS, belongs to the second floor, but the configuration is different.
FEP handles all interfaces with the integrated system, and the data collected from FEP is sent to the station server through the station switch. The station server, station master workstation and FEP are connected with the network switch.
(2) Software composition
According to different characteristics, the integrated monitoring system software used in the scheme is divided into different levels in terms of hardware, software, function and operation. For example, the central level generally controls the whole line of rail transit, with a wide monitoring range and a response time of seconds, while the municipal level generally controls a certain equipment, with a small monitoring range and a response time of milliseconds. Each layer is interrelated and relatively independent, for example, station level and local level are connected through FEP, and central level and station level are connected through backbone network, exchanging data with each other and not interfering with each other. In addition, the design of this scheme also takes into account the higher management above the central level, allowing interconnection of information. The hierarchical structure of the integrated monitoring system is shown in the above figure:
On the plane structure, the communication middleware FoxBus is adopted, and all functional modules are combined and coordinated through FoxBus. The plane structure of the system is shown in the following figure. FoxBus componentizes the software modules, allowing each module to be arbitrarily allocated on the hardware, and any workstation can monitor and operate the operators at the corresponding level according to the permissions of the logged-in users.
In this scheme, hardware FEP is used to isolate the ISCS station from the prefecture-level system, so that the subsystem and the ISCS system are both interrelated and independent. On the one hand, the abnormality of subsystem will not affect the operation of ISCS, so the data interference range of subsystem can be controlled. On the other hand, the abnormality of ISCS system will not affect the operation of each subsystem. Even if ISCS is completely paralyzed, each subsystem can continue to work normally, ensuring the monitoring function of the basic layer of rail transit. According to the environmental characteristics and climatic conditions of Xi 'an, this scheme adopts a large number of industrial products, such as FEP, switches, servers, etc., which are resistant to electromagnetic interference, moisture and shock.
The software structure of ISCS can be divided into three layers: system software, supporting software and application software. From the perspective of data flow, it is divided into: data interface layer; Data processing layer; Man-machine interface layer. The data interface layer is mainly composed of FEP, which collects and processes data for the first time. FEP has the ability of protocol conversion and adopts embedded real-time operating system. ISCS system receives the information of access system through pre-communicator, and isolates irrelevant access. The front-end communication machine has the ability to convert various hardware interfaces and software protocols. The access system transmits data to the ISCS system through the front-end computer, and the ISCS system also transmits relevant data to the access system through the front-end computer. At the same time, FEP also has the function of isolating the integrated monitoring system and related systems.
The data processing layer is mainly composed of a station server and a central server. The station server completes the secondary processing and collection of data, and centrally processes the data of each FEP for the display and operation of the man-machine interface of the station ISCS, and collects the data in the station. The central server not only completes the data processing and collection of the center, but also completes the third centralized data processing for the display and operation of the man-machine interface of the control center ISCS, and collects the data within the whole line.
Man-machine interface layer is a graphical interface for man-machine interaction provided by ISCS, through which ISCS can display equipment status information, operation information, fault information, alarm information, statistical report information and so on. At the same time, with the help of a series of tools provided by the system, operators can monitor, set up and control remote devices on the operator workstation.
Integrated Monitoring System (ISCS) includes central integrated monitoring system (CICS), station integrated monitoring system (SICS), parking lot and depot integrated monitoring system (NMS), network management system (MMS), equipment maintenance management system (TMS), software testing platform (STP) and so on. Central comprehensive monitoring system: collect and process the status and performance data of important monitored objects in real time, and display them in the form of graphics, images, tables and texts through various dispatcher workstations and large screens for the dispatcher to control and monitor. According to a certain logical relationship, the mode, program control and point control commands are automatically sent to the monitored objects or systems distributed in various stations, or the dispatcher manually sends control commands, thus completing the centralized control and display of the whole line environment and equipment. Comprehensive monitoring system of the station: the workstation and printer equipment of the stationmaster on duty can reflect the state information of the monitored object in real time, form a report, record relevant information and update relevant data at the same time. DISCS, as two special stations, is regarded as a station-level comprehensive monitoring system, which monitors the status and performance parameters of monitoring equipment in parking lots and depots in real time. Network management system: Built in the center, it provides a series of maintenance, monitoring and quick fault handling means for network systems and equipment, allowing network administrators to manage the network efficiently through a simple interface. Equipment maintenance management system: set in the depot, equipped with maintenance workstations, printers, etc. To realize the playback and maintenance scheduling management of the whole power supply system and electromechanical equipment system. Training management system: allows one-way access to the running system, so that TMS can use real running scenes to demonstrate to students. Regarding the training environment, the system provides an interface to simulate the relevant system specifications to simulate the field environment. Teachers can modify the simulated environment during training, observe students' reactions and provide suggestions when necessary. Software test platform: STP can test the software functions of related systems and meet the requirements of ISCS software installation test and interface test with related systems. STP is combined with TMS hardware, and the software is configured separately. The software testing platform is connected with the monitoring network of the integrated monitoring system, which is convenient for the software testing platform to maintain the software of the integrated monitoring system.