CN108227545A - Cascade control system - Google Patents
Cascade control system Download PDFInfo
- Publication number
- CN108227545A CN108227545A CN201611162291.XA CN201611162291A CN108227545A CN 108227545 A CN108227545 A CN 108227545A CN 201611162291 A CN201611162291 A CN 201611162291A CN 108227545 A CN108227545 A CN 108227545A
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- CN
- China
- Prior art keywords
- controller
- detection transmitter
- regulating valve
- control
- inner loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0421—Multiprocessor system
-
- 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
- G05B2219/24—Pc safety
- G05B2219/24182—Redundancy
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a kind of cascade control system, including：Main detection transmitter, pair detection transmitter, master controller, submaster controller, regulating valve and selecting switch.Pair detection transmitter connection submaster controller；Main detection transmitter, master controller, submaster controller are sequentially connected；Selecting switch is connected respectively with master controller, submaster controller, regulating valve；Pair detection transmitter, submaster controller, selecting switch and regulating valve form inner loop circuit；Main detection transmitter, master controller, submaster controller and regulating valve composed cascade circuit；Main detection transmitter, master controller, selecting switch and regulating valve form inner loop bypass loop.The present invention can be bypassed by inner loop when components are overhauled or are replaced and be selected in the controller on subloop or detection transmitter, loop in series is enable directly to control regulating valve, and passes through parameter and tracks the no-harass switch ensured between inner loop control, serials control and inner loop Bypass Control mutually.
Description
Technical field
The invention belongs to chemical engineering industry control technology fields, relate in particular to a kind of cascade control system, main to apply
In the Industry Control of petrochemical industry PET industry.
Background technology
In chemical engineering industry control field, serials control is a kind of control method being used widely.With traditional single time
Path control system is compared, and there are two closed loops for cascade control system tool：One closed loop is subloop, is responsible for during control thick
It adjusts.Another closed loop is major loop, and fine tuning is completed during control.When carrying out subloop control：Major loop is in excision
State, measurement variation of the subloop according to measured by secondary detector, exports corresponding signal to control object；Carrying out tandem control
When processed：Subloop is placed in auto state, the variation of main ring measured value that loop in series is measured according to primary detector, and the output phase should be believed
Number to subloop SP ends as setting value, subloop outputs signal to control according to the variation of inner loop measured value and the setting value
Object processed.Existing cascade control system the problem is that：It can be only done two kinds of functions of subloop control and serials control.When
When produced on-site operates, when the detection transmitter on subloop or its corresponding hardware progress ad hoc inspection and repair or replacement, string
Grade circuit and inner loop circuit can not all put into and automatically control, and can only control to adjust valve by exporting manually.Awaiting Overhaul and replacement
After restart carry out serials control again, affect the effect of control, when operating mode is unstable, under serious situation because
Inner loop detection transmitter parameter can not be out of control with reference to being also possible to cause to control.In addition, in many cases, without with reference to subloop
Measurement value parameter valve system is controlled.Therefore, a kind of novel serials control circuit how is developed, disclosure satisfy that
It is that those skilled in the art need to grind because demand or special operation condition control loop in series with inner loop bypass in process
The direction studied carefully.
Invention content
The present invention provides a kind of cascade control systems, can be in the portions such as the controller on subloop or detection transmitter
It is bypassed and selected by inner loop when part is overhauled or replaced, loop in series is enable directly to control regulating valve, and pass through
Parameter tracks mutually the no-harass switch ensured between inner loop control, serials control and inner loop Bypass Control, to overcome existing string
Grade control system is in defect present on structure.
The specific technical solution that it is used is as follows：
A kind of cascade control system, including：Main detection transmitter, pair detection transmitter, master controller, submaster controller, regulating valve
And selecting switch.The secondary detection transmitter connection submaster controller；It is described it is main detection transmitter, master controller, submaster controller according to
Secondary connection；The selecting switch is connected respectively with master controller, submaster controller, regulating valve；The secondary detection transmitter, secondary control
Device processed, selecting switch and regulating valve form inner loop circuit；The main detection transmitter, master controller, submaster controller and regulating valve
Composed cascade circuit；The main detection transmitter, master controller, selecting switch and regulating valve form inner loop bypass loop.
By using above-mentioned technical proposal：It can not only complete existing inner loop circuit control and serials control.Practice
In can also be enabled when loop switch to inner loop bypass loop state of a control by starting selecting switch, enable inner loop circuit in cutting
Except state, output tracking is directly realized by with inner loop bypass loop and valve controls.
Preferably, in above-mentioned cascade control system：The selecting switch uses HS5115 controllers.
Preferably, in above-mentioned cascade control system：The submaster controller uses FICA5101 controllers.
Preferably, in above-mentioned cascade control system：The master controller uses PICA5115 controllers.
Preferably, in above-mentioned cascade control system：The regulating valve uses FV5101 regulating valves.
Compared with prior art, the present invention can be examined in the components such as the controller on subloop or detection transmitter
It is bypassed and selected by inner loop when repairing or replacing, loop in series is enable directly to control regulating valve, and it is mutual to pass through parameter
Tracking ensures the no-harass switch between inner loop control, serials control and inner loop Bypass Control.
Description of the drawings
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the structure diagram of cascade control system used in the prior art；
Fig. 2 is the structure diagram of the embodiment of the present invention 1；
Fig. 3 is the control algolithm schematic diagram of the embodiment of the present invention 1.
Each reference numeral and component names correspondence are as follows：
11st, main detection transmitter；12nd, master controller；21st, secondary detection transmitter；22nd, submaster controller；3rd, regulating valve；4th, selection is opened
It closes.
Specific embodiment
In order to illustrate more clearly of technical scheme of the present invention, below in conjunction with attached drawing, the invention will be further described.
Fig. 2 show the embodiment of the present invention 1：
A kind of cascade control system, including：Main detection transmitter 11, pair detection transmitter 21, master controller 12, submaster controller 22
With regulating valve 3 and selecting switch 4.Wherein：The selecting switch 4 uses HS5115 controllers.The submaster controller 22 uses
FICA5101 controllers.The master controller 12 uses PICA5115 controllers.The regulating valve 3 uses FV5101 regulating valves.
The secondary detection transmitter 21 connects submaster controller 22；The main detection transmitter 11, master controller 12, submaster controller 22 are successively
Connection；The selecting switch 4 is connected respectively with master controller 12, submaster controller 22, regulating valve 3；The secondary detection transmitter
21st, submaster controller 22, selecting switch 4 and regulating valve 3 form inner loop circuit；The main detection transmitter 11, master controller 12, pair
3 composed cascade circuit of controller 22 and regulating valve；The main detection transmitter 11, master controller 12, selecting switch 4 and regulating valve
3 form inner loop bypass loop.
In contrast to the prior art as shown in Figure 1：It is additionally arranged in this example with main detection transmitter 11, master controller 12, choosing
Select switch 4 and the inner loop bypass loop that is formed of regulating valve 3.And pass through selecting switch 4 and realize switching to inner loop bypass loop
Control.
It is illustrated in figure 3 the control algolithm principle of the embodiment of the present invention 1.In this figure, lower left corner panel in order to control.
Mainloop module composition main ring controllers, subloop module composition inner loop controllers.Right side sel modules are opened for selection in figure
It closes, valve modules are control valve.In practice, the course of work is as follows：When circuit is in inner loop control, at this time by inner loop
Road circuit is in excision state (SP 0), and the output valve (OUT) of main ring circuit (mainloop) is by tracking pin at this time
(OTM) actual setpoint (ASP) of inner loop circuit (subloop) is tracked, therefore ensure that main ring returns when switching to serials control
When road exports setting value (SP) of (OUT) to inner loop circuit, the value of the two is equal, reaches no-harass switch.When circuit needs to be switched to
The hand auto state (SMA) in inner loop circuit (subloop) is introduced during serials control, in program.As inner loop circuit (subloop)
In the state of automatic, just serials control is allowed to come into operation.Main ring circuit output (OUT) has to the setting value (SP) of inner loop at this time
Effect, avoids generating maloperation due to the carelessness of operator.When circuit needs to switch to inner loop bypass main ring control, pass through face first
Plate by inner loop bypass come into operation (SP 1), within the time of a pulse, main ring circuit (mainloop) export (OUT) by with
The output valve (OUT) of track pin (OTM) tracking inner loop circuit (subloop), after end-of-pulsing circuit control switch to main ring and return
Road (mainloop) exports, and reaches no-harass switch.Inner loop circuit while switching to main ring circuit (mainloop) output
(subloop) it forces to be transferred to manual mode (inner loop MM puts 1), and export the output for tracking main ring by tracking pin (OTM), with
Energy no-harass switch returns inner loop control model during inner loop bypass excision after standby；When circuit needs to cut off inner loop bypass main ring control mould
Formula, when returning to inner loop control, main ring spontaneous can enter manual mode (main ring MM puts 1), in case next inner loop control is switched to string
It is used during grade control.
The above, only specific embodiments of the present invention, but protection scope of the present invention is not limited thereto, it is any ripe
The technical staff of art technology is known in technical scope disclosed by the invention, the change or replacement that can be readily occurred in should all be contained
Lid is within protection scope of the present invention.Protection scope of the present invention is subject to the protection domain of claims.
Claims (5)
1. a kind of cascade control system, including：Main detection transmitter（11）, pair detection transmitter（21）, master controller（12）, it is secondary
Controller（22）And regulating valve（3）；
The secondary detection transmitter（21）Connect submaster controller（22）；The main detection transmitter（11）, master controller（12）, it is secondary
Controller（22）It is sequentially connected；
It is characterized in that：Further include selecting switch（4）；The selecting switch（4）Respectively with master controller（12）, submaster controller
（22）, regulating valve（3）It is connected；The secondary detection transmitter（21）, submaster controller（22）, selecting switch（4）And regulating valve（3）
Form inner loop circuit；The main detection transmitter（11）, master controller（12）, submaster controller（22）And regulating valve（3）Form string
Grade circuit；The main detection transmitter（11）, master controller（12）, selecting switch（4）And regulating valve（3）Inner loop is formed to bypass back
Road.
2. a kind of cascade control system as described in claim 1, it is characterised in that：The selecting switch（4）It is controlled using HS5115
Device processed.
3. a kind of cascade control system as described in claim 1, it is characterised in that：The submaster controller（22）Using FICA5101
Controller.
4. a kind of cascade control system as described in claim 1, it is characterised in that：The master controller（12）Using PICA5115
Controller.
5. a kind of cascade control system as described in claim 1, it is characterised in that：The regulating valve（3）It is adjusted using FV5101
Valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162291.XA CN108227545A (en) | 2016-12-15 | 2016-12-15 | Cascade control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162291.XA CN108227545A (en) | 2016-12-15 | 2016-12-15 | Cascade control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108227545A true CN108227545A (en) | 2018-06-29 |
Family
ID=62651525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611162291.XA Pending CN108227545A (en) | 2016-12-15 | 2016-12-15 | Cascade control system |
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| Country | Link |
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| CN (1) | CN108227545A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509432A (en) * | 2008-01-29 | 2009-08-19 | 欧陆汽车有限责任公司 | Control system and work method for a control system |
| US7814527B2 (en) * | 2005-04-12 | 2010-10-12 | Thomson Licensing | Device and process for pairing a master decoder and slave decoders and reception system incorporating said device |
| CN102021603A (en) * | 2010-09-02 | 2011-04-20 | 天辰化工有限公司 | Chlorine zero-pressure control method applied to process for preparing alkali by utilizing zero-pole ionic membrane electrolytic cell |
| CN103225799A (en) * | 2013-05-09 | 2013-07-31 | 北京四方继保自动化股份有限公司 | Method for controlling main steam temperature in thermal power plant |
| CN103322547A (en) * | 2013-06-25 | 2013-09-25 | 西安艾贝尔科技发展有限公司 | Boiler control and combustion optimization method |
-
2016
- 2016-12-15 CN CN201611162291.XA patent/CN108227545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7814527B2 (en) * | 2005-04-12 | 2010-10-12 | Thomson Licensing | Device and process for pairing a master decoder and slave decoders and reception system incorporating said device |
| CN101509432A (en) * | 2008-01-29 | 2009-08-19 | 欧陆汽车有限责任公司 | Control system and work method for a control system |
| CN102021603A (en) * | 2010-09-02 | 2011-04-20 | 天辰化工有限公司 | Chlorine zero-pressure control method applied to process for preparing alkali by utilizing zero-pole ionic membrane electrolytic cell |
| CN103225799A (en) * | 2013-05-09 | 2013-07-31 | 北京四方继保自动化股份有限公司 | Method for controlling main steam temperature in thermal power plant |
| CN103322547A (en) * | 2013-06-25 | 2013-09-25 | 西安艾贝尔科技发展有限公司 | Boiler control and combustion optimization method |
Non-Patent Citations (1)
| Title |
|---|
| 乐建波: "《自动控制系统技术原理》", 31 May 2000 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 201699, room 2, building ninth, building 62, 238 middle Zhongshan Road, Shanghai, Songjiang District Applicant after: Shanghai Fuling Automation Control System Co., Ltd Address before: 201699, room 2, building ninth, building 62, 238 middle Zhongshan Road, Shanghai, Songjiang District Applicant before: SHANGHAI FL-AUTOMATION Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180629 |