DLCS-4000 is based on the high-speed Fieldbus control system, which combines a digital communication technology, computer technology, automatic control technology, network technology and intelligent instruments and other technical means, from a fundamental break with the traditional "point-to-point" type of analog or digital control of an analog signal the limitations constitute a completely distributed, all-digital, intelligent, two-way, interconnection, multivariable, multiple contacts communications and control system. Scattered in various industrial scene intelligent instrument through digital fieldbus as a single entity, and with the control room of the controller and monitor together constitute DLCS-4000 control system. By following certain international standards can be different vendors fieldbus product integration in the system, with interchangeability and interoperability.

DLCS-4000 traditional DCS control functions to further decentralize the scene Intelligent Instrumentation from the field Intelligent Instrumentation complete data acquisition, data processing, computing and control data output function. Field instrument data (including data collection and diagnostic data) Fieldbus spread through the control room control equipment, the control room control equipment used to monitor all field instrument operations, the preservation of Intelligent Instrumentation upload data, while completing a small field instrument unable to complete the senior control functional. In addition, the DLCS-4000 gateways and also through the superior management of enterprises connected to enterprise managers to gain first-hand information, provide a basis for decision-making.

DLCS-4000 has the following salient features

An open
DLCS-4000 open the communication protocols, with the same communication standard equipment from different vendors between the interconnection and exchange of information. Users can choose from different vendors fieldbus products to the actual composition of the control system, to achieve the best system integration.

2 interoperability
Interoperability is different vendors control equipment can not only communicate with each other, but the configuration can be integrated to achieve the same control strategies and "plug and play", the performance of different manufacturers of the same equipment can be exchanged.

Three flexible network topology
DLCS-4000 control system based on the complexity of the situation into different network topology, such as the tree, star, bus type and hierarchical network structure.

Four of the system structure highly decentralized nature
The equipment itself is the scene intelligent devices, the independent control of basic functions, thus fundamentally changing the focus of DCS and scattered combination of Architecture, forming a new distributed control system that control the function of the total dispersion, improved control system reliability, simplified control system structure. Fieldbus and on a network connection equipment to maintain the independence of the underlying normal operation, the extent of its Intelligent greatly enhanced.

Scene 5 of highly intelligent devices
The traditional use of DCS relatively centralized control station, the station by the CPU module and input / output unit. DLCS-4000 DCS control system will be the function of the pipeline completely decentralized control equipment to the scene, relying on the fieldbus devices can achieve automatic control of basic functions, such as data acquisition and compensation, PID computing and control, self-checkout equipment and self diagnostics. System operators in the control room remote control, set the scene or adjust the equipment operating parameters, but also use the site since the equipment diagnostic functions to locate and fault diagnosis.

Six pairs of highly adaptive environment
DLCS-4000 is designed for industrial site design, it can use twisted-pair, coaxial cable, fiber optic cable, power lines and wireless means to transmit data, and has a strong anti-jamming capability. Common data transmission line is a cheap UTP, and allow the use of field-based data communication lines for electricity, but also to meet intrinsic safety explosion-proof requirements.

DLCS-4000 system architecture and technology indicators

The DLCS-4000, the system's basic structure : IPC or commercial PC, fieldbus master interface cards, fieldbus input / output modules, or PLC NC / CNC multi-tasking real-time control software, configuration software and application software.

PC's main features include system configuration, database configuration, historical library configuration, graphics configuration, control algorithm configuration, data statements configuration, real-time data, historical data, graphics, parameter lists, data printouts, data input and parameter changes, control system Operational conditioning, alarm processing, fault handling, communications control, and man-machine interface and other areas, and truly focus on controlling risk dispersion, data sharing, completely open control requirements.

With fieldbus technology, all the I / O modules are placed on the industrial scene, but all of the signal through the Distributed Intelligent I / O modules in the field are converted into standard digital signal, a cable can only put all the sub-station site link, then signal the scene very SR McNair transmitted to the control room to monitor devices, digital data transmission system to enable high speeds and very strong anti-jamming capabilities.

The DLCS-4000, the software and hardware are to follow the same standards, interoperability, and easy replacement. Procedures designed with IEC1131-3 five international standard programming languages, programming and development tools is completely open, but also can use the rich PC hardware and software resources.

The DLCS-4000, a single PC can be completed simultaneously with two sets of original equipment to complete the PLC and NC / CNC tasks. In multi-tasking Windows NT operating system, PC soft PLC can be as many as 10 concurrent implementation of several PLC task, we have improved the efficiency and reduce costs. But on a PC, PLC with an online debugging and simulation function, significantly improved the programming environment.

The scene is removed layer, multi-layer network DCS was flattened and all field devices independent nodes function can be strengthened.

DLCS-4000 transmission characteristics

DLCS-4000 is in line with intelligent field instrumentation and develop. It was replaced with digital communications 4-20mA analog transmission technology.
Its adoption of the ISO reference model of three layers (physical layer, data link layer and the application layer) and featuring user-level, user-level automation control aimed at the needs of application, the definition of a unified information access rules, using device description language provides a common set of functional blocks. Its low-speed bus H1 transmission speed of 31.25kbps, communication distance of up to 1.9km (plus repeater can be extended), to support bus-powered, and the essence of anti-riot security environment. The H2-bus transfer rate of 1Mbps or 2.5Mbps, the communications distance of 750 and 500m. H1 and H2 each section up 32 points, the use of repeater up after 240, cell death and H2 can bridge interconnection. The physical transmission medium for unshielded twisted pair, fiber optic cable and wireless, its transmission signal using Manchester encoding.

To further enhance the speed of communications, the communications gradual introduction of new industrial Fast Ethernet, the transmission speed of 100Mbps.

Ethernet hub

Ethernet technology will be added to the agreement H2 and H2 as to the underlying agreement, its use of satellite-based network topology.

Hub (HUB) at center and network through Ethernet I / O interface articulated scene equipment, real-time field instrument and the general field instrument (through the channel) were articulated in different Ethernet I / O interface. Ethernet I / O interface high-speed (about 100 kHz) scan all live instrumentation and real-time access group, then transmit data packets to the upper controller.

Usually ordinary control algorithm controller at the scene for (upper controller can be downloaded), and senior control algorithm in the upper controller, and control the output by its Ethernet hubs and Ethernet I / O interface transfer to a field instrument. As real-time field instrument articulated in the exclusive importer of Ethernet addresses, and use completely separate circuit transmission of data, so the guarantee will not have real-time data transmission delay and obstruction lines.

As the network hub for arbitration, in addition to controlling both the communications transmission time, but also the transmission of data packets for priority settings, so that each message contains priority transmission such as real-time parameters. In addition intelligent dynamic hub can also detect the need for communications equipment scene where Ethernet I / O port, and provide data buffer, this could significantly reduce the scene equipment to reduce response time and data re-issued number. Other hub hub and connected network can be realized between the different data sharing.

Using Ethernet hub technology DLCS-4000 will enable real-time data to control the delay time of 200 ns within the scope of this has been sufficient to satisfy the majority of occasions, the real-time control requirements.

DLCS-4000 Application of the following advantages :

Low-cost

As DLCS-4000 is the all-digital communications - but its control fully functional equipment to the scene and, therefore, no need to import, export and other panels; But the scene devices can be directly connected with the control desk, eliminating the need for connecting the panels to the "data superhighway", the above part of the redundancy in the fieldbus system that will naturally be no longer necessary. DLCS-3000 only retain the Distributed Control System (DCS) of field devices and operating stations, operating station has ceased to be a key part of system.

DLCS-4000 can perform a great variety of equipment for measurement, control and, thus reducing the number of transmitter, eliminating the need for single-loop controller and computing components, thereby saving costs.

Simple configuration

As all Instrumentation has introduced a functional module configuration very similar, or simple, not because of the different types of automation equipment configuration or different methods of training or learning programming languages. Functional modules based on user-defined parameters and standards identifier based on the user identifier can be designated to a particular device, there is no need to consider equipment addresses, memory addresses and bit numbers. Configuration can be edited by computer, and then downloaded to the scene automation equipment.

As different manufacturers, different models of the instrument calibration, measurement range and set the diagnostic procedures are consistent, make simplified operator training and equipment upgrading.

Searching for more information and diagnosis of the situation

Digital communication allows users from the control room were searching all the equipment, configuration, operation and diagnostic information to become a reality. But DLCS-4000 multi - variable characteristics of the instrument and other automation equipment innovations provide a broader space.

DLCS-4000's self-diagnosis function of fault can be timely, so maintenance personnel before the incident occurred can promptly identify potential site of the accident and to carry out repairs. The hardware (such as sensors, actuators and memory modules) fault, software (such as configuration and calibration), the problems can be promptly reported.

Operators put transmitter without detection can be sent to obtain the necessary information, resulting in substantial savings of time and cost.

The installation, operation, maintenance is simple

As the field instrument is connected in parallel, the terminal joint check the workload is greatly reduced, so wiring simple, usually a cable to connect 20 facilities.

DLCS-4000 equipment to simulate the import value, the output value or condition. This makes operators in the control room will be able to test system of fault conditions and the course of the reaction.

DLCS-4000 can store useful information for the maintenance, and information will not be lost. A lot of useful information was stored on automation equipment, which can access from handheld terminal, can access from the operator station.

Database consistency

DLCS-4000 using a fully distributed database concept. Any fieldbus interface with the human-machine interface can display relevant information, so as not to be repetitive, inconsistent databases. Fieldbus use only one database, or scattered at the scene Instrumentation database, is the man-machine interface from the database to obtain "calibration data", handsets which are also accessible with a database.

As new digital control system DLCS-4000, can give full play to the upper Scheduling, optimization, decision-making functions, but also constitute Computer Integrated Manufacturing System (CIMS), and better play its role. Conducive to the implementation of the integrated enterprise automation strategy to enable enterprises from extensive to intensive transformation.

DLCS-4000 Application of automation systems greatly reduce the investment, only the system wiring, installation, maintenance costs are comparable to the existing system to reduce by 66% the other, but also save factory space, reducing the laying of cable trays and other investment decline.