1. Introduction
DLCS-2000 decentralized process control system is years of research on a variety of domestic and foreign products DCS technology, based on the pooling power generation for many years, paper, chemical and other production process control experience the latest new generation of DCS products; It is a blend of computers, networks, databases, information technology and automatic control system integration technology for industrial information technology products.

The open-architecture, modular design technology, a reasonable allocation of hardware and software functionality and ease of expansion, and can be widely used in the power plant distributed control, plant scheduling and management information system, substation monitoring, network automation and steel enterprises BF monitoring, chemical process automatically mills and process automation.

The structure of system

The application form, process control modules PCU under I / O size of the number of Cabinet decision, the man-machine interface HMI stations under different user configurations decision on the quantity and specifications

2. Features

DLCS-2000 system is the biggest characteristic of the open, hardware, software and communications are adopting international standards or the mainstream of industrial products, and constitute an open industrial control systems.

• Hardware----- Hardware computer hardware to follow the development trend. Man-machine interface (HMI), the use of standard industrial PCs. I / O cards using pieces of low-power, fully sealed design. Card pieces average consumes less than 1W, Packaging IP50 standards, which can effectively prevent all kinds of dust. The main control unit PCU military standard PC bus architecture, advanced heat pipe technology to the CPU when the Heat lead to a metal shell package, the abolition of the internal fans, has greatly enhanced the reliability of the control unit.
  
  
  
• Software----- Control software modules PCU Linux system software, which can effectively prevent all kinds of viruses. Man-machine interface based on Windows NT operating systems. Convenient intuitive IEC-61131-3 PCU graphics configuration of software, graphics, reporting, control, record statistics software generation tool.
  
  
• The system scalability ----- DLCS-2000 is targeted at the medium and large process control system. It also fully consider the hundreds or even 100 points below the demand for the smaller system. DLCS-2000 every one of the I / O chassis alone can constitute a reliable, flexible configuration, performance improvement process control system
  
  
• Communications------ Communications using sophisticated computer network communications technology to create a high-speed real-time data network redundancy, with IEEE802.3 standard 10/100 Mbps speed communications.
  
  
• Shows----- Show high-resolution, resolution 1280 x 1024 x 1200 or 1600. The window display and 3D display screen.
  
  
• Integration----- Integration through Ethernet (Ethernet) and other information connected to the network, from the industrial production process control, measurement, production management information integration.
  
  
• Sinification----- Finished all finished, show support for the Chinese and English interface.
  
  
• Network----- Real-time network data network (A network, Network B) redundant network, transmission of real-time data to support a 250-node network.Information Data Network (C Network) database file and print sharing, non-delivery systems, real-time file information.
  
  
• Capacity----- Distribution capacity real-time database of Internet nodes transparent, global data capacity of 64,000 points analog, 64000 Switches volume.
  
  
• Real-time ----- 1 seconds can be updated all the overall situation, a transfer within seconds of any graphics, 50ms cycle control.
  
  
• Open----In addition to open-access the company's I / O modules, the company adopted the protocol conversion station also received other commonly used as HH Fieldbus, HART, PROFIBUAS I / O system, PLC, factory-level MIS and other control systems.

• Development-----The hardware and software to follow the international mainstream industrial products developed simultaneously.
  
  
• Functional-----Set analog control, sequential control, monitor and record data in a single package.
  
  
• Reliability-----The system reliability design, using redundancy, fault-tolerant technology, dual power supply, guarantee system ≥ 150,000 hours MTBF.
  
  
• Spare parts-----Standardization and serialization, spare parts types greatly reduced.
  
  
• Safeguard-----Self-channel diagnostic procedures, CRT automatic alarm and display can be quickly charged to replace MTTR<5Min.

  3. Hardware

  3.1 The whole structure

  The system, on-site control cabinet hardware is very important, it has a direct relationship to the whole system of security. Scene control cabinet mainly redundant power group, the process control of the control unit (PCU), I / O station, box fans, power switching bins.

Map is the scene to control the appearance of Cabinet map

3.2 Cabinet

The rack system is produced in accordance with international standards, measuring 800mm x 600mm x 2200mm with GM, large capacity and facilitate flexible. Rack installation of internal : the top-down for redundant DC power group, PCU, IO Guide boxes of cards pieces exchanges into line distribution bins.

3.3 The process of processing units PCU

The process of processing units PCU is DLCS-2000 process control station, storage systems and process control information and data strategy. It includes : fieldbus communication and control, real-time network (Data Highway), the exchange of information, process control logic and circuit adjust the calculation algorithm implementation capabilities. PCU, real-time network and fieldbus are redundant configuration

PCU map is equipped with the I / O station contour map

3.4 IO card case

I / O card pieces to complete the real-time field data acquisition and control output. All the I / O card pieces have to pass I / O card with pieces on the 96 line Continental pin inserted into I / O card exclusive guideway pieces inside to work. Guideway box back there Bus slot, the card pieces of the power and communications completed by the bus, I / O signals in the field input and output from the board after the extraction socket adapter for small and medium-sized cable systems site can be directly linked to the spring CRIMPING Terminals (direct access 2.5mm2 wire) . I / O card with the PCU between pieces to serial bus communication, I / O card with the PCU exists between the transmitted data cards similar to the station control card, a repeater type of components. Under normal circumstances need not be reprovisioned system terminal extension counters, not only reduces costs but also greatly enhance the reliability of the system

3.5 system power components

DC power system can be divided into the power within and outside the two most power. It is within the power rack for computer systems within the power supply, composed of two parts : a section for PCU and track inside the I / O card pieces voltage of 24V. Outside power for signal conditioning terminal board and external transmitter power : one group for analog signal conditioning and external transmitter, as well as voltage +24 V; Another group of dedicated switches number of inquiries, voltage of +48 V. (Switch also can be used for voltage +24 V or higher voltage)

3.6 Distribution box drawer

Counter to the scene to control single-phase AC power supply, rated voltage of 220V and voltage allowed the 180V - 260V time. Redundant power supply, configuration, dual power : two independent single-phase road power, access to distribution boxes, then by internal switching power supply sent to the DC component of the input. Distribution of the boxes is another role for the maintenance of power scene.

4. Software Features

4.1 followed IEC61131-3 standard and more perfect system programming

• Full compliance with international IEC61131-3, more flexible and efficient programming
• For Ladder (LD), the function block (FBD), directives (IL), Structured Text (ST) programming language
• Supports standard variable definitions
• Support for standard functions and function blocks
• External interface, which allows users to use C + + to prepare their control algorithm

4.2 Enhanced Dual Redundant

• Dual redundant equipment
• Users can set up a redundant switching mode

4.3 powerful online downloading and debugging

• Single-step, breakpoint debugging procedures
• Online editing, dynamic updating, parameters to Reading

4.4 sound help documentation

Rich in content and programming online help manual, to facilitate customers to learn and use.

5. Technical performance

DLCS-2000 distributed control system network architecture

DLCS-2000 system of communication network is based on the International Organization for Standardization (ISO), the open system interconnection (OSI) standard, based on IEEE standards and TCP / IP protocol.

DLCS-2000 network-level units into DCS network and Plant Control Information Network, DCS network data into real-time information network with two data network, using both Ethernet.

(1) SIS Plant Information Network Monitoring

DLCS-2000 SIS Plant Information Network Monitoring System SIS connecting the bottom of the real-time control system and senior DCS HMI, such as the value of long points, calculated stations, load distribution stations, communications gateways, Web servers.

SIS Plant Monitoring Information Network using Ethernet.

Communication protocol：IEEE802.3

Communications Rate：100Mbps

Communications Media : Fiber

(2) real-time data network DCS

DLCS-2000 DCS real-time data link network processing units PCU process, the operator station pickup, engineers ENG station, the historical data points HSU different nodes. High-speed transmission of real-time data, configuration information and controls.

DCS real-time data network using 1:1 redundant structure. 1:1 redundant communication interface cards, designed a transmission error detection technology, a network fault will affect communication, and enhanced system security and reliability.

• Communication protocol IEEE802.3 broadcast.
• Communications 10/100 Mbps rate.
• Passive communication medium coaxial cable, twisted pair or fiber.
• Support for 250 nodes.
• The distance between nodes 100 meters -- 40 km.
• Overall real-time database capacity : 64,000 point analog, 64000 Switch.

(3) DCS Information Data Network

DLCS-2000 DCS information data networks, network-configuration, linking loader operator station, the engineer ENG, historical data points HSU peers. HMI as to the rapid and efficient information transmission channel for unit-level file and print sharing.

(4) I / O Network

• 1:1 redundant industrial control networks
• PCU, I / O interface cards redundant configuration
• Command / response mode, the main structure
• High-speed serial communication bus 345K ~ 1Mbps speed, RS-485 standard.
• Photoelectric Communication Interface isolation
• Communications media, shielded twisted-pair cables
• Up to 250 nodes
• Distributed Measurement and Control, the largest 40-kilometer distance distribution
• Support Remote I / 0

Communications systems

DLCS-2000 I / O card pieces of the main technical data

• Network types : Ethernet Ethernet
  
• Transmission rate : about 10M/100Mbps
• With station capacity : 250
• Transmission Media : Passive optical fiber or coaxial cable
• Communications maximum distance : 40km
• Communications agreed agreement : broadcast, point-to-point

Provide broadcasting equipment of all online high-speed data link. All nodes share the entire DLCS-2000 distributed global database of radio communications bottleneck.

Second Broadcasting process 59,985 points.

All PCU stations and HMI stations to engage in real-time data highway, data communications. All HMI station Ethernet connectivity and information, real-time management information and real-time control of information from each other, the actual realization of information control.

Communication bus load of not more than 20%.

• Plant Level Monitoring and Information System SIS communications

Network types : Ethernet Ethernet

Rate : 100Mbps

Transmission medium : fiber

Software：

DLCS-2000 System Operator Station using Windows 32 operating system. CRT resolutions up to 1280 x 1024, image update rate and picture transfer speed of less than one second. DLCS-2000 process control engineers to provide language-based process control configuration CAD graphics, in line with the international standard IEC-61131-3.

Reliability measures

To make the system strong anti-jamming capability (with anti-jamming capabilities, "Power Plant Distributed Control System technical specification" standards), DLCS-2000 system to take the following measures :

Redundant Configuration

Controller (PCU) 1:1

Power (PCU, I / O, M / A power, the transmitter power, DI inquiries Power) 1:1

Data Highway 1:1

Multi-station operations as a backup

Power systems : decentralized and redundant

Self-diagnosis : all standard stations, self-diagnosis function in the station to normal enforcement process run, does not affect the ability to process real-time and automatically withdraw from the fault system, the man-machine interface points on the corresponding information from the police, and I / O board LED display.

Network error control : the transmission of information using CRC, and with rich online self-diagnostic tools.

Bumpless Transfer : PCU redundancy and allows for automatic switch without disturbance.

I / O Module : provide reliable semiconductor optoelectronic segregation and isolation card, and these common-mode rejection ratio up to 120dB, anti-common-mode voltage 500Vp-p; Its series mode rejection ratio up to 60db, anti-mode voltage Series 30 Vp-p, allowing charged plugged. All I / O card misuse pieces AC220 voltage card then they do not damaged.

All PCU CPU load rate of less than 30%, a single power supply margin greater than 40%;

Power

Exchange into line : dual power supply and each reserve.

AC input : 220VAC 50Hz (180V - 260V)

Input Capacity : 1500VA

DC Power Supply dual redundant configuration, high output election

PCU Power Supply : 24V Power 350W

IO card pieces boxes Power Supply : 24V Power 350W

External terminal board and transmitter power supply : +24 V power 350W

External switching power supply voltage number of inquiries : +48 V power 150W

Mechanical properties

Scene control cabinet : 800mm x 600mm x 2200mm

Working environment

Operating environment temperature : -20 ° C to +60 ° C

Storage temperature : -40 ° C to +85 C.

Operating environment relative humidity : 10 ~ 95% (condensation)

6. DLCS-2000 system's technical performance indicators

6.1. Precision

Analog input signal big error : ≤ 0.1% (0-55 ° C)

Analog input signal small error : ≤ 0.2% (0-55 ° C)

Analog Output Error : not more than 0.2%

Sequence of events (SOE) time resolution : <1ms

Time synchronization system error :

I / O stations (the I / O board between), not more than 0.25ms

I / O stations between <1ms

6.2 anti-jamming capabilities

Die-channel interference common mode rejection ratio :> 120dB

Die-channel differential mode interference suppression ratio :> 60db

Input circuit dielectric strength 1000V

I / O card pieces of the electromagnetic compatibility through CE-EMC certification test.

6.3 Network Performance

I / O network communication rate : Bitbus375K to 2M bps, Ethernet 10Mbps.

Network Communication System rate : 10M to 100M bps

6.4 real-time

Real-time data scanning cycle : Switch 50ms; Analog 100ms

Control Period : 50 ~ adjustable 5000ms

Real-time images response time : <1s

Reliability measures 6.5

Redundant power

Redundant Network

Distributed Redundant processing unit (PCU)

Redundant I / O Module

Charged replacement panels

Die keeping (exclusive power module configuration of the system after the loss -- the circumstances remain 30mim time)

System reliability evaluation

System average time between failures (MTBF) and availability :

System MTBF of not less than 150000h.

System availability rate of not less than 99.95%

6.6 Power Performance

AC Power Supply : 220VAC ± 20%, 47 ~ 53HZ

DC output : the scene 24V power supply module when the maximum load voltage drop is not more than 1%.

Ripple factor : the scene in power modules not more than 1%, system power modules not more than 1%.

Protection :

Over-current protection : load rated to achieve 105% ~ 150% protection

Overvoltage protection : nominal output voltage value of 140% ~ 170% protection

Capacity 6.7

Distributed processing unit (PCU) Maximum capacity

I / O points : 1536 control loops : 32

Under the system load, system control cycle, control of the physical rack space capacity requirements, an I / O circuit control station and a few I / O points of the proposal :

- Pulse input, analog input / output points : ≤ 192

- Switch input / output points : ≤ 384
- Interrupt switches volume (SOE) points : ≤ 384

History database capacity : 16,000, a typical three months, depending on the longest drive.

Quantitative real-time picture :> 500, depending on hard disk.

Each picture dynamic set point number :> 512.

The number of network nodes, total 250

Engineers Station (ENG) / Operator Station (HMI) : 40

Distributed processing unit (PCU) : 80

Statements : Based on Excel, and quantity with no restrictions on capacity.

System load factor of 6.8

A typical configuration of the following :

Operator Station (HMI) <40%

Distributed processing unit (PCU) <40%

Network <20%

6.9 of the site signal characteristics of the interface

AI input impedance

10M-voltage signal Ω

Current signal 250 Ω

AO maximum load (24V power supply)

4 ~ 20mA 750 Ω

0 ~ 10mA 1K Ω

Dry contact DI

Inquiries voltage at 48V on-resistance of less than 10K Ω

Shutdown greater than 100K ohm resistor

When inquiries voltage 24V on-resistance of less than 5K Ω

Shutdown greater than 50K ohm resistor

DO maximum load capacity

Resistance : 30VDC 10A 10A 250VAC

Perception : 250VAC 4A 30VDC 4A

PI frequency 50KHZ

I / O signal loops are additions overvoltage and overcurrent protection circuit to prevent the strings from signal lines into high voltage and high current internal system caused the damage.