Abstract: This paper describes in detail the company s economic advantage Ryoden large AnSH PLC and economic compact FX2N PLC and its corresponding a function module, FR-540 converter, and using a higher transmission speed, reliability and good CC-Fieldbus Link, a real-time architecture is strong, good sea conditions and the reliability of distributed real-time simulation system. The system was developed for marine research vessel provides a practical type of semi-physical simulation platform, save a lot of funding for pilot testing, reducing the test material and human resources required, while to some extent, also for marine energy development the simulation test, fill the gaps in the industry.
Key words: PLC CC-Link-the-loop simulation
A design background ship in the ocean swing posture, anti-wave performance of the hull of the ship s navigation of the stability and security of great significance. Ship in the ocean different sports attitude: heel, trim, upper and lower levels representing different sea conditions, ship s seaworthiness appropriate level of an important indicator of marine vessels. Therefore, in the design of the ship, especially when ocean-going vessels, marine vessel design, must be calculated through the hull of the anti-scientific wave level. However, only a theoretical value calculation must be repeated in the sea wave test to be amended. This test is not only time-consuming, laborious, but also waste a lot of money. Some units in order to reduce expenditure, the sea-waves reduced to the minimum number of tests, not only affects the integrity of test data, and some data are not necessarily complete. To avoid this phenomenon, so that ocean and marine vessel design more scientific, saving time, effort, provincial funding, we use the REC automation PLC AnSH major practical and economic compact FX2NPLC, FR-E540 frequency converter and using CC-Link fieldbus, developed a 50 meters long, 30 meters wide, 6 m deep wave tank system can simulate the real-time sea conditions, waves, ship design to achieve a semi-physical simulation platform can not only provide to Ship Design unit and ship certification unit loop real-time simulation for ship design provides realistic sea conditions of test site data, but also that ocean wave energy development unit of power plant development. This semi-physical simulation platform for distributed system 90 had formed in a foreign country, in our ship design unit is currently under trial work.
2 Components and Design
2.1 The system components for real-time simulation of sea conditions, waves, currents, waves and waves and other processes, the wave system has the following sub-systems
1) wave subsystems: the pool is equipped with three pairs of high-power push plate wave machine and a small wave machine, large and small wave machine can produce different combinations of vertical transmission of Changfeng wave, the maximum wave height up to 0.3 m, by the computer program control, can generate the rules needed to model test waves or irregular waves.
2) create flow system: the pool built with a set of high pressure water jet stream system, even on both sides of the pool wall clouds nozzles, pump suction pressure from the tube after the tube from the clouds of spray ejected, resulting in the pool uniform flow. The system can generate vertical flow and horizontal flow, maximum flow rate of 0.1 m / sec. In addition, the local-made stream system configuration to meet the high flow test flow and different needs.
3) creates the wind systems: configuration of a portable fan-made air system. Maximum wind speed up to 5 m / s, through the computer control system to simulate the wind spectrum.
4) The trailer system: experiment in the drag can be the trim, smooth wave and transverse wave drag test, but also on x, y direction of the drag adjustment for oblique wave tests.
5) The pool filter system: the pool with a mechanical filtering system.
6) The wave system: the other side of the wave maker with a certain tilt of the grid-type wave beach to absorb wave energy preventing reflected wave.
2.2 The system design to achieve the above functions, the system uses hierarchical, modular concept, true distributed control system. Among them, wave subsystems, subsystems, and creates the wind stream created sub-systems are controlled by two PLC, sea conditions, waves are big waves, small waves, ripple waves, sea conditions to simulate the characteristics of the first large waves of high by the AnS PLC control, small waves, ripple waves from the FX2N PLC control. Create flow subsystem similar. The only way to simulate sea conditions in the two large waves in the head with a number of small high tide. Wave generation process are: the PLC analog output module output 0 ~ 10V control signals control the FR-E540 frequency converter output frequency, real-time control of three-phase inverter induction motor speed, motor drive wave device chip size against water, the motor speed difference between the first two waves caused by wave processes and the different peaks, so that a different three-phase induction motor speed with different wave head wave range, corresponding to the peak, therefore, two three phase induction motor can be a different combination of real-time reproduction speed to simulate different sea conditions. Flow system made from the same combination AnSH PLC and FX2N PLC control their power pump, the formation of different flow of energy. Made by the AnSH PLC controlled air system fan power to achieve.
In order to improve reliability, the control system is also designed speed manual backup systems to ensure that computer failure does not affect the wave. When the computer fails, the switching device without human intervention, manual backup switch to its own speed control system, operators can adjust potentiometer converter speed to maintain a normal wave process. 3 by the AnSH PLC, FX2N PLC and FR-E540 frequency converter and three-phase asynchronous motor is composed of three control modules and composed by the PC server, interactive server architecture system configuration shown in Figure 1. AnSH PLC, FX2N PLC configuration shown in Figure 2, shown in Figure 3.
2.2.1 AnSH PLC characteristics and configuration A1SJHCPU is the most economical AnSH series CPU by the CPU component. A1SJHCPU is unique in that it s CPU, power supply and substrate assembly as a whole, thereby significantly reducing manufacturing costs. AnSH Mitsubishi used for sequence control and mathematical operations and development of "mitsubishi control processor chip" (MSP). AnSH not only faster than AnS fast, and increased CC-Link dedicated instructions, the original instructions are still preserved (including PID, floating point and trigonometric functions, etc.). While the built-in performance, such as lithium batteries, back-up RAM, the user memory, real-time clock and a flexible communication port, so AnS series can adapt to a very wide range of applications. Complete components of their special features, so AnSH perfectly applicable to process control, positioning control, and other types of control. Compared with similar products, its cost is high, which is what we use AnSH reasons. Among
1) A1SH42 digital input / output modules: the main control some control relays, contactors open and closed, and relay control of motor and inverter with the power of open and closed.
2) A1SJ61BT11 CC-Link fieldbus communication adapter: used with the system server in the CC-Link master module communication, real-time transmission AnSH PLC to monitor the amount of state and parameters, while receiving control instructions transmitted by the server.
3) A1S66ADA analog input / output modules: real-time monitoring of the pool water pressure trend (reflecting the condition of the sea level), to the FR-E540 frequency converter to provide analog control volume, so the inverter output frequency, to control three-phase asynchronous motor The purpose of speed, so as to control, simulated sea conditions of storm and wave height, wave process.
4) A1SD62D high-speed counter module: real-time monitoring of three-phase asynchronous motor speed to A1S66ADA module for the motor speed PID regulator.
2.2.2 FX2N PLC characteristics and configuration FX2N Series PLC FX family is the most advanced series, which accommodate the widest range of standard features, faster program execution, full complement of communications for the world and meet different power individual needs of a large number of special function modules for factory automation applications to provide maximum flexibility and control. By FX2N PLC with good cost performance, it not only has the hardware configuration of the performance and function better performance, but also feature-rich software instruction set is the best representatives of a small PLC, while it has not to match, and the speed of advanced features, logical options and positioning control characteristic, FX2N is from 16 to 256 input / output options for a variety of applications. Its flexible configuration, high-speed operation, highlighting the register capacity, abundant resources and components, especially for small points of process control. Among
1) FX2N-64MT-D control module: the digital input / output module to control some control relays, contactors open and closed, and relay control of motor and inverter with the power of open and closed.
2) FX2N-32CCL CC-Link fieldbus communication adapter: used with the system server in the CC-Link master module communication, real-time transmission FX2N-64MT monitor the amount of state and parameters transmitted by the server while receiving the control instruction.
3) FX2N-4AD analog input modules: real-time monitoring of the pool water pressure trend (reflecting the condition of the sea level);
4) FX2N-2DA Analog output modules: FR-E540 frequency converter to provide analog control volume, so the inverter output frequency, to control the purpose of three-phase asynchronous motor speed to control, simulated sea conditions of storm and wave height, wave process.
5) FX2N-1HC high-speed counter module: real-time monitoring of three-phase asynchronous motor speed to FX2N-2DA module for the motor speed PID regulator.
2.2.3 Server Configuration
CC-Link mainly from the model, therefore, in the control room of the master server must be plugged up a main mode of CC-Link Communication Adapter: A80BD-J61BT11. To improve its control of real-time, communication speed selected 2 .5 M, the operating system used Windows NT4.0 + SP4. Systems programming development environment for Visual C + + Ver6.0. And install a SQL Server V7.0, for human computer interaction, CC-Link network configuration, real-time database access, historical data playback control commands such as transfer and delegation of tasks, simulated three-dimensional graphics display.
2.3 CC-Link fieldbus CC-Link is Control& Communication Link (Control and Communication Link System) is referred to, is an open field bus to the main layer of the network device, its data capacity, communication speed multi-level choice, and it is a complex, open, adaptable network systems, able to adapt to the higher management in the network to a lower layer of the network of sensors in different areas. Can be realized from the CC-Link to connect AS-I bus. CC-Link high-speed data transfer rate, the most up to up to 10Mbps. CC-Link communication protocol to follow the underlying RS-485, under normal circumstances, CC-Link mainly broadcasting a polling approach to communication, CC-Link also supports the main station and local stations, intelligent device stations instant communication.
CC-Link. With excellent performance, wide range of applications using a simple cost savings and other advantages.
2.4 System Reliability
PLC output module relay contacts within the small little arc was a bad break, can not be directly used for plant-level ~ 220V ~ 380V circuit must drive an external relay PLC, the contact with the external relay driver ~ 380v negativeSet. At the same time more AC220V ~ 380V solenoid valve coil in series with internal limit switch normally closed contact, solenoid valve coils, valve movements, is the contact with the valve to disconnect the internal circuit. In this case, to use a small relay contact to relay smaller PLC output signal. The system uses a high-power silicon devices, PLC should stay away from strong sources of interference. PLC can not be installed in the same high-voltage electrical switch cabinet, the cabinet should stay away from power lines PLC (the distance between them should be more than 200mm). And the PLC with a switch installed in the cabinet of the magnetic element, such as relays, contactors coils, arc should be parallel RC circuit. PLC s I / O lines and power lines should be separated from the alignment, as must be in the same groove in the wiring, signal lines should use shielded cable. AC line and DC line should each use a different cable, switch, analog I / O lines should be laid separately, which should be shielded cable. Different types of lines should be split into different cable pipe or cable slot, and make it a distance as large as possible Also, as the CC-Link system to complete all data communications, and therefore demands high reliability and communication cables should be use CC-Link dedicated cable recommended and provided.
3 system characteristics in the system, can be a variety of semi-physical simulation of ships and marine energy development test:
1) a new marine engineering research and development structures, shipbuilding force components analysis and model test,
2) can wave power device research and development.
3) waves, currents, wave and current interaction state of the simulation and the next wave of processing technologies, the marine environment, numerical prediction of the simulation, ocean buoys, ocean hydrographic equipment design, calibration, calibration.
4) various types of ship design, structural strength and hydrodynamic properties.
4, control system simulation software design software is the key to the system core, but also difficult. Including PC visualization software and human-computer interaction PLC control software, two large, interactive visualization software program modules mainly by the man-machine interface, digital signal processing program modules, databases, program modules etc., are using Visual C + + programming , in the control process, the main program can be used at any time by DAO SQL query in the database to read and write data. After the end of the simulation, statistical data can be explained process operations, can choose the start time and end time statistics, the computer automatically measured the time all of the data statistics. And three-dimensional animation can be displayed intuitive, relevant data can be backed up, delete, export, print statements and other operations, in order to facilitate human-computer interaction.
In the simulation server, due to extensive data analysis, image processing, human-computer interaction, so use the Windows NT as the operating system for data analysis, simulation of communication, sea state simulation fitting and simulation evaluation. The overall structure of system software as shown in Figure 2.
Experience of 5 in this system, system hardware selection is the key, how to choose cost-effective and reliable hardware platform should be the design of the system simulation platform one of the keys, the system reliability design is the focus of this design.
1) REC s AnSH and FX2N PLC in the industrial control market share is higher PLC, the application of its reliable quality, high performance cost-effective and strong anti-interference is known, makes the application of these two PLC system reliability and economy is assured.
2) compared with other products, Mitsubishi PLC instructions simple and to the user programming, maintenance is a great convenience, reducing the production cost, shorten the development cycle can be larger.
3) CC-Link fieldbus high transfer rate, data reliability, the system ensures reliable transmission of a large number of simulation data, making real-time systems, reliability is guaranteed. Meanwhile, CC-Link Application significant reduction in field wiring, and system maintainability is improved.
4) The system uses the concept of truly distributed, the simulation platform, the correlation between reduced, to facilitate the system design, analysis and application.
5) The system consists of manual and remote computer is to control two ways to increase the flexibility of the system.
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