CN110488771A - A kind of DCS control system - Google Patents
A kind of DCS control system Download PDFInfo
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- CN110488771A CN110488771A CN201910567097.7A CN201910567097A CN110488771A CN 110488771 A CN110488771 A CN 110488771A CN 201910567097 A CN201910567097 A CN 201910567097A CN 110488771 A CN110488771 A CN 110488771A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4181—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by direct numerical control [DNC]
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41815—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the cooperation between machine tools, manipulators and conveyor or other workpiece supply system, workcell
- G05B19/41825—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the cooperation between machine tools, manipulators and conveyor or other workpiece supply system, workcell machine tools and manipulators only, machining centre
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4184—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by fault tolerance, reliability of production system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication
- G05B19/41855—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication by local area network [LAN], network structure
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication
- G05B19/4186—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by the network communication by protocol, e.g. MAP, TOP
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/4188—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by CIM planning or realisation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25232—DCS, distributed control system, decentralised control unit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses DCS control systems, belong to communication technique field, wrap a kind of DCS control system, including main control module, expansion module, conversion module, lathe module, the main control module is connect with expansion module, the expansion module connects conversion module, the conversion module connecting machine tool module, it is characterized by: the main control module is equipped with I/O mouthfuls of number for direct corresponding field device, the main control module is at least provided with serial ports and network interface for connecting corresponding communication apparatus in DCS system, the main control module is equipped with the SPI for connecting expansion module and extends communication port.The present invention both can improve the performance of whole system to avoid the failure for causing whole system due to a website failure.
Description
Technical field
The invention belongs to DCS communication technique field more particularly to a kind of DCS control systems.
Background technique
DCS is the english abbreviation (Distributed Control System) of dcs, at home automatic control
Industry is also referred to as Distributed Control System.It is a kind of novel computer control system for centralized control system,
It is to develop on the basis of centralized control system, be evolved.It is one by process control level and process monitoring level
Composition using communication network as the multi-level computer system of tie, combine computer, the 4C technology such as communication, display and control,
Its basic thought is decentralised control, centralized operation, differentiated control, configuration flexibly and configuration is convenient.
In existing DCS system, direct data control function, a website failure can not be handled live I/O and realized
It will cause the failure of whole system, system performance is poor.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of DCS control systems solved the problems, such as.
The invention is realized in this way including main control module, expansion module, conversion module, lathe module, the master control
Molding block is connect with expansion module, and the expansion module connects conversion module, the conversion module connecting machine tool module, feature
Be: the main control module be equipped with I/O mouthful of number be used for directly corresponding field device, the main control module at least provided with
Serial ports and network interface are equipped with for connecting corresponding communication apparatus in DCS system, the main control module for connecting expansion module
SPI extend communication port.
System of the present invention can handle live I/O completely and realize the network node of direct data control function, one
Live I/O control station is set in set, it, both can be to avoid due to a station to share the I/O and control function of whole system
Point failure causes the failure of whole system, improves the performance of whole system, and operator station is that all are related with operation operation for processing
Human-machine interface function network node, engineer station is that off-line arrangement, configuration work and online system prison are carried out to system
The network node superintend and direct, control, safeguarded, major function, which is to provide, carries out configuration, tool software (the i.e. group of configuration work to system
State software), and on the monitoring system network implemented in system on-line operation each node operating condition.
In the above-mentioned technical solutions, it is preferred that the serial ports includes the port COM1 and the port COM2.
In the above-mentioned technical solutions, it is preferred that the serial ports includes the port COM1 and the port COM2.
In the above-mentioned technical solutions, it is preferred that the conversion module includes analog-digital converter (ADC), digital-to-analogue conversion
Device (DAC), analog-digital converter (ADC) and digital analog converter (DAC) are equipped with the SPI communication terminal for connecting input and output
Mouthful, the analog-digital converter (ADC) and digital analog converter (DAC) are equipped with COM PORT COM；The analog-digital converter
(ADC) it is set to data collection terminal mouth, the digital analog converter (DAC) is equipped with data-out port.
In the above-mentioned technical solutions, it is preferred that the lathe module is equipped with I/O mouthfuls of number, and the lathe module is equipped with net
Mouthful, the lathe module is equipped with the SPI for connecting expansion module and extends communication port.
Detailed description of the invention
Fig. 1 is the topological diagram of network interface system of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
To solve drawback, the present invention provides a kind of DCS control systems.Structure in order to further illustrate the present invention, knot
It is as follows to close attached drawing detail specifications:
Referring to Fig. 1, a kind of DCS control system, including main control module, expansion module, conversion module, lathe module,
The main control module is connect with expansion module, and the expansion module connects conversion module, the conversion module connecting machine tool mould
Block, it is characterised in that: the main control module is equipped with I/O mouthfuls of number for direct corresponding field device, the master control molding
Block is equipped with for connecting corresponding communication apparatus in DCS system, the main control module for connecting at least provided with serial ports and network interface
Connect the SPI extension communication port of expansion module.The serial ports includes the port COM1 and the port COM2.
In the present embodiment, the OPC communication that the network interface of main control module is adopted international standards can connect any communication
Equipment.The port COM1 of main control module is communicated using Mitsubishi's Programming of programmable controller mouth；The port COM2 is using standard
Modbus communication.The bussing technique of SPI extension communication port is a kind of synchronous serial interface that motoroal company releases.SPI is total
Line is a kind of three line locking buses, because its hardware capability is very strong, so it realizes software with regard to comparatively simple.AD7888 and a variety of strings
Line interface is compatible, can flexibly be used in the design according to the chip used, is convenient to realize to spi bus using program
Control.Digital I/O mouthfuls of output digital quantity and input digital quantity can enable main control module and the equipment not communicated carry out pair
It connects.In the present embodiment, digital I/O mouthfuls of communication is output and input using high speed communication, can be used for numerically-controlled machine tool, input
Reach 4 microseconds with the output time, improves the control precision of lathe.System of the present invention can completely to live I/O processing and it is real
The network node of existing direct data control function, it is a set of in live I/O control station is set, to share the I/O of whole system
And control function, both the performance of whole system can be improved, was grasped to avoid the failure for causing whole system due to a website failure
Work person station is to handle all network nodes that related human-machine interface functions are operated with operation, engineer station be system is carried out from
Line configuration, configuration work and online system monitor, control, maintenance network node, major function be to provide to system into
Row configuration, the tool software (i.e. configuration software) of configuration work, and on the monitoring system network implemented in system on-line operation
The operating condition of each node.
Expansion module is communicated using high-speed CAN, can not only be communicated with the pairing product remote high-speed of oneself, can also be with
The product of CAN communication communicates, and can achieve real-time data acquisition and issues function.Communication distance can achieve 10KM or more.It is logical
News mouth is completely isolated, bigger working environment place can interfered to use.Communication speed most can achieve 1Mbit fastly.This
Module, which need to only be simply provided, can reach filtering function, not need the agreement for specially learning CAN, and upper hand is easy not needed too
More professional knowledge can also operate, and appearance atmosphere, and high reliability, opening, flexibility, harmony, control function are complete
And the later period it is easy to maintain (one by process control level and process monitoring level form using communication network as tie multistage calculate
Machine system combines the 4C technologies such as computer computer, communication communication, display crt and control control,
Its basic thought is decentralised control, centralized operation, differentiated control, configuration is flexible, configuration is convenient).
The conversion module includes analog-digital converter (ADC), digital analog converter (DAC), analog-digital converter (ADC) and
Digital analog converter (DAC) is equipped with the SPI PORT COM for connecting input and output, the analog-digital converter (ADC) and
Digital analog converter (DAC) is equipped with COM PORT COM；The analog-digital converter (ADC) is set to data collection terminal mouth, described
Digital analog converter (DAC) is equipped with data-out port.
SPI PORT COM can realize that SPI connects grade input, output, occupy SPI port without independent.Conversion module has all the way
COM communication port supports modbus communications protocol, and not having to SPI can also be with host computer, Communication for Configuration Software.
In the present embodiment, analog-digital converter (ADC) has the input acquisition port on 8 tunnels, 0-20mA, carries out analog/digital and turns
It changes, using U.S. ADC dedicated convert chip, has many advantages, such as that conversion time is short, acquisition precision is high, Serial Peripheral Interface
Spi bus technology is a kind of synchronous serial interface that motoroal company releases.SPI bus is a kind of three line locking buses, because
Its hardware capability is very strong, so it realizes software with regard to comparatively simple.AD7888 is compatible with a variety of serial line interfaces, can be according to making
Chip flexibly uses in the design, is convenient to realize to spi bus control using program.
Digital analog converter (DAC) has 4 road DAC delivery outlets, analog/digital conversion is carried out, using U.S. Analog
The voltage-current converter AD694 chip of Device company production, input voltage signal can be converted into the 4- of standard by it
20mA current signal can be widely applied to the parameter transmitting of the signals such as pressure, flow, temperature and to valve, adjuster and process
Some commonly used equipments control in control, it have input buffer amplifier, V/I conversion circuit, 4mA current offset and its gating and
Trimming circuit, reference voltage circuit, input range selection end, open circuit and off-limit alarm output end, function are stronger.It can reach
0.002% nonlinearity, precision height and strong interference immunity, is that process control, industrial automation control and system monitoring can not
A kind of ideal integrated circuit lacked.
The lathe module is equipped with I/O mouthfuls of number, and the lathe module is equipped with network interface, and the lathe module is equipped with for connecting
Connect the SPI extension communication port of expansion module.
SPI PORT COM can realize that SPI connects grade input, output, occupy SPI port without independent.There is COM communication all the way
Mouthful, SPI can not had to communicated with host computer, configuration software yet, support all not silent communication.
Lathe module is exported equipped with 4 road DAC, carries out analog/digital conversion, raw using Analog Device company, the U.S.
The voltage-current converter AD694 chip of production, input voltage signal can be converted into the 4-20mA current signal of standard by it,
It can be widely applied to the parameter transmitting of the signals such as pressure, flow, temperature and to some common in valve, adjuster and process control
Equipment control, it has input buffer amplifier, V/I conversion circuit, 4mA current offset and its gating and trimming circuit, reference
Potential circuit, input range selection end, open circuit and off-limit alarm output end, function are stronger.It can reach 0.002% it is non-linear
Degree, precision height and strong interference immunity, are process control, industrial automation control and a kind of indispensable ideal of system monitoring
Integrated circuit.Lathe module is able to achieve to be pinpointed with lathe high-precision, origin control, host computer (or main module, main module only need down
Send out running track instruction, this module can automatic running as required, designed hereby than previous PLC High Speed I/O control precision
Height, programming is convenient, only needs a few step instructions (or code) that can realize that high precision machine tool is run, machining accuracy is generally reachable
0.05—0.1MM)。
Lathe module uses PID control.
Wiring AD1, AD2 connect analog quantity feedback point；DA1 meets control output 4-20mA；Digital quantity I1 connects control equipment operation
Instruction；Digital quantity O1 connects operating instruction；AD3, AD4 connect analog quantity feedback point；DA2 meets control output 4-20mA；Digital quantity I3 connects
Control the operating instruction of equipment；Digital quantity O3 connects operating instruction.Main module need to only send the parameters such as PID and target data, this mould
Block can automatic running.This module has forward and reverse PID control, it is simple with its structure, stability is good, reliable operation, tune
Perfect square just becomes one of the major technique of Industry Control.
PID exports the characteristic that is positive, when feedback signal is given greater than PID, it is desirable that the decline of frequency converter output frequency can just make
PID reaches balance, such as the tension PID control of winding.PID output is anti-espionage, when feedback signal is given less than PID, it is desirable that become
Frequency device output frequency rises, and just PID can be made to reach balance, the tension PID control such as unreeled.When the structure and parameter of controlled device
When cannot grasp completely, or cannot get accurate mathematical model, when other technologies of control theory are difficult to use, system controller
Structure and parameter must be determined by experience and field adjustable, it is at this moment the most convenient using PID control technology.I.e. when us
Not exclusively understand a system and controlled device, or when obtaining system parameter, cannot be most suitable for by effective measurement means
With PID control technology.PID control also has PI and PD control in practice.PID controller is exactly the error according to system, using than
Example, integral, difference gauge calculate what control amount was controlled.
Ratio control is a kind of simplest control mode.The output of its controller pass proportional to input error signal
System.When only proportional control, there are steady-state errors (Steady-state error) in integration control for system output, control
The output of device and the integral of input error signal are proportional.To an automatic control system, if deposited after entering stable state
In steady-state error, then claiming this control system is to have steady-state error or abbreviation to have poor system (System with Steady-
state Error).In order to eliminate steady-state error, " integral term " must be introduced into the controller.When integral term depends on error
Between integral, as time increases, integral term will increase.Even if in this way, error very little, integral term also can be with the increasing of time
Add and increase, it pushes the output increase of controller to further decrease steady-state error, until close to zero.Therefore, ratio+product
Divide (PI) controller, can make system after entering stable state almost without steady-state error.Differential control in, the output of controller with
The differential (i.e. the change rate of error) of input error signal is proportional.Automatic control system is in the adjustment process for overcoming error
In it is possible that oscillation even unstability.The reason is that due to there are larger inertia component (link) or having lag (delay)
Component has the function of inhibiting error, changes the variation for always lagging behind error.Solution is the work for making to inhibit error
Variation " advanced ", i.e., when error is close to zero, inhibiting the effect of error should be just zero.This is to say, in the controller
Only introducing " ratio " item is often inadequate, and the effect of proportional is only the amplitude of fault in enlargement, and needs increased to be " differential
", it can predict the trend of error change, in this way, having ratio+differential controller, it will be able to make to inhibit error in advance
Control action is equal to zero, even negative value, so as to avoid the serious overshoot of controlled volume.So to having larger inertia or lag
Controlled device, ratio+differential (PD) controller can improve dynamic characteristic of the system in adjustment process.
Claims (4)
1. a kind of DCS control system, including main control module, expansion module, conversion module, lathe module, the master control molding
Block is connect with expansion module, and the expansion module connects conversion module, the conversion module connecting machine tool module, and feature exists
In: the main control module is equipped with I/O mouthfuls of number for direct corresponding field device, and the main control module is at least provided with string
Mouth and network interface are equipped with for connecting corresponding communication apparatus in DCS system, the main control module for connecting expansion module
SPI extends communication port.
2. DCS control system according to claim 1, it is characterised in that: the serial ports includes the port COM1 and the end COM2
Mouthful.
3. DCS control system according to claim 1, it is characterised in that: the conversion module includes analog-digital converter
(ADC), digital analog converter (DAC), analog-digital converter (ADC) and digital analog converter (DAC) are equipped with for connecting
The SPI PORT COM of input and output, the analog-digital converter (ADC) and digital analog converter (DAC) are equipped with COM communication terminal
Mouthful；The analog-digital converter (ADC) is set to data collection terminal mouth, and the digital analog converter (DAC) is equipped with data output end
Mouthful.
4. DCS control system according to claim 1, it is characterised in that: the lathe module is equipped with I/O mouthfuls of number, institute
Lathe module is stated equipped with network interface, the lathe module is equipped with the SPI for connecting expansion module and extends communication port.
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| CN201910567097.7A CN110488771A (en) | 2019-06-27 | 2019-06-27 | A kind of DCS control system |
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