CN109027377A - CAN bus based valve control device - Google Patents
CAN bus based valve control device Download PDFInfo
- Publication number
- CN109027377A CN109027377A CN201810741585.0A CN201810741585A CN109027377A CN 109027377 A CN109027377 A CN 109027377A CN 201810741585 A CN201810741585 A CN 201810741585A CN 109027377 A CN109027377 A CN 109027377A
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- China
- Prior art keywords
- valve
- bus
- communication module
- control
- unit
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Programmable Controllers (AREA)
Abstract
The invention discloses a kind of CAN bus based valve control devices, including PLC control unit, communication module, CAN bus and valve unit, wherein, PLC control unit is connect with communication module, communication module is connect by CAN bus with valve unit, it is attached between each valve of valve unit using serial connection mode, each valve includes respective valve control module, the signal that valve control module receives CAN bus is acted with control valve, after valve execution movement, valve status data is returned into communication module by CAN bus, status data is sent to PLC control unit again by communication module, PLC control unit generates new control data according to status data.Thus the wire laying mode at scene and the difficulty of installation and debugging, maintenance are enormously simplified.
Description
Technical field
The present invention relates to technical field of valve control, in particular to a kind of CAN bus based valve control device.
Background technique
There are two types of types for the control of operated pneumatic valve.One is switch valves, use on-off control, that is, control its ON/OFF,
As long as this control is plus a solenoid valve it is achieved that when solenoid valve excitation, valve is opened (or closing), when solenoid valve demagnetization,
Valve closes (or opening).Another kind is regulating valve, i.e., adjustable type controls, and other than ON/OFF, can control valve and is in arbitrarily
Open position, this control will add a pneumatic positioner valve to valve, and a rod piece is drawn on valve rod, position with valve
The concentric connection of device feedback rod group.Valve event will be driven after the control electric signal that valve positioner receives 4-20mA,
When the feedback of valve position and control signal reach balance, the aperture of valve is just controlled in the position.Electric signal is 4-20mA's
Be in range it is variable, the valve position of valve is also and then variable.
Currently, operated pneumatic valve mostly uses PLC (programmable logic controller (PLC)) to be controlled.For switch valve, need PLC's
I/O point is individually controlled；For regulating valve, general PLC is controlled by the analog quantity of 4-20mA.The control phase of switch valve
To simple, two movements are only opened or closed, the control to switch can be realized by different I/O output points in PLC.Regulating valve
Control it is relative complex, PLC needs to control the switch angle of regulating valve to module using the analog input of 4-20mA
System.
When needing simultaneously to control multiple valves, at present mainly using different according to switch valve or regulating valve
Control principle, each valve is individually routed and is independently controlled.It is that existing valve control device shows shown in attached drawing 1
It is intended to, wherein to multiple valves, (valve 1, valve 2, valve 3 ... valve n) are individually controlled PLC respectively.This control mode
Major defect be: route is various, and number of wires is directly proportional to valve quantity, and a large amount of cloth is needed when valve quantity is more
Line, thus not only increases the difficulty of installation and debugging, and later maintenance is also very inconvenient.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of valve control devices, are worked based on CAN bus, to overcome existing skill
The shortcomings that art.
To achieve the above object, the present invention provides a kind of CAN bus based valve control devices, including PLC to control
Unit, communication module, CAN bus and valve unit, which is characterized in that PLC control unit is connect with communication module, communicates mould
Block is connect by CAN bus with valve unit, is attached between each valve of valve unit using serial connection mode, often
A valve includes respective valve control module, and the signal that valve control module receives CAN bus is acted with control valve, in valve
After door execution movement, valve status data is returned into communication module by CAN bus, communication module again sends status data
To PLC control unit, PLC control unit generates new control data according to status data.
Preferably, in above scheme, the interface between PLC control unit and communication module uses RS422 type interface.
Compared with prior art, the invention has the following beneficial effects: use digital communication, Real-time Feedback valve shape
State, convenient for monitoring valve state；CAN bus based valve control device applies the mode of CAN bus, passes through communication
Module and valve control module match, and realize to the Digital Control and serial connection of valve, enormously simplify scene
Wire laying mode and installation and debugging, maintenance difficulty.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing valve control device.
Fig. 2 is the schematic diagram of CAN bus based valve control device of the invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Fig. 2 is the schematic diagram of CAN bus based valve control device of the invention.As shown, PLC control unit with
Communication module connection, communication module are connect by CAN bus with valve unit, using serial between each valve of valve unit
Connection type is attached, and each valve includes respective valve control module, and valve control module receives the signal of CAN bus
It is acted with control valve, after valve execution movement, valve status data is returned into communication module by CAN bus, is communicated
Status data is sent to PLC control unit again by module, and PLC control unit generates new control data according to status data, by
This is achieved that the control to multiple valves only with the bus cabling to connect with communication module, enormously simplifies the wiring at scene
The difficulty of mode and installation and debugging, maintenance.
The working principle of 2 pairs of valve control devices of the invention is described in detail with reference to the accompanying drawing.
Control command is sent to communication module by interface by PLC control unit, and RS422 type interface can be used in interface.PLC
The course of work divide three phases, i.e., input sample, user program execute and output refreshes, and using cluster sampling, concentrate and export
Working method, reduce external interference signal influence.In the input sample stage, PLC is successively read in all defeated with scanning mode
Enter state and data, and they are stored in the corresponding units in I/O image area.After input sample, it is transferred to user program
Execute and export the refreshing stage.In the two stages, even if input state and data change, the phase in I/O image area
The state and data for answering unit will not change.In the case where input is pulse signal, the width of pulse signal is had to be larger than
One scan period just can ensure that the input is read into.The stage is executed in user program, PLC is according to from top to bottom, from left to right
Sequence successively scan user program.After scanning user program, PLC enters the output refreshing stage.During this period,
The output latch circuit CPU of PLC all according to corresponding state in I/O image area and Refresh Data, using output circuit
Corresponding peripheral hardware is driven, this is only the real output of PLC.
After communication module receives the control command of PLC transmission, the order received is sent to accordingly by CAN bus
Valve valve control module.Each valve unit includes valve control module, to realize to the accurate of each valve
Control.Valve control module is connect with valve, the state for control valve.Valve control module, which receives, passes through CAN bus
After the order sent, corresponding order is executed at once, control valve executes corresponding actions, the i.e. aperture of control valve terminal,
It records and is shown as a result, and returning to the status data of valve in time.
After communication module receives the status data of valve return, the data of return are sent to again by RS422 interface
PLC.PLC generates new control data according to the returned data received.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (2)
1. a kind of CAN bus based valve control device, including PLC control unit, communication module, CAN bus and valve
Unit, which is characterized in that PLC control unit is connect with communication module, and communication module is connect by CAN bus with valve unit,
It is attached between each valve of valve unit using serial connection mode, each valve includes respective valve control mould
Block, the signal that valve control module receives CAN bus are acted with control valve, after valve execution movement, by valve state number
Communication module is returned to according to by CAN bus, status data is sent to PLC control unit, PLC control unit again by communication module
New control data are generated according to status data.
2. a kind of CAN bus based valve control device as described in claim 1, which is characterized in that PLC control unit with
Interface between communication module uses RS422 type interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810741585.0A CN109027377A (en) | 2018-07-06 | 2018-07-06 | CAN bus based valve control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810741585.0A CN109027377A (en) | 2018-07-06 | 2018-07-06 | CAN bus based valve control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109027377A true CN109027377A (en) | 2018-12-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810741585.0A Pending CN109027377A (en) | 2018-07-06 | 2018-07-06 | CAN bus based valve control device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080237511A1 (en) * | 2003-07-08 | 2008-10-02 | Aaa Sales & Engineering Inc. | Pneumatic Retarder Actuator Valve |
| CN102913495A (en) * | 2012-09-28 | 2013-02-06 | 上海人豪液压技术有限公司 | Modularized combined electric-hydraulic multitandem valve system adopting compact type two way cartridge valve |
| CN204284593U (en) * | 2014-11-20 | 2015-04-22 | 天津市希思特电子科技有限公司 | High-precision electric final controlling element |
| CN205422842U (en) * | 2016-03-17 | 2016-08-03 | 四川东方电气自动控制工程有限公司 | Steam turbine valve control system based on CAN bus |
| CN106233051A (en) * | 2014-03-21 | 2016-12-14 | 伟创力有限责任公司 | Intelligent electromagnetic coil |
-
2018
- 2018-07-06 CN CN201810741585.0A patent/CN109027377A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080237511A1 (en) * | 2003-07-08 | 2008-10-02 | Aaa Sales & Engineering Inc. | Pneumatic Retarder Actuator Valve |
| CN102913495A (en) * | 2012-09-28 | 2013-02-06 | 上海人豪液压技术有限公司 | Modularized combined electric-hydraulic multitandem valve system adopting compact type two way cartridge valve |
| CN106233051A (en) * | 2014-03-21 | 2016-12-14 | 伟创力有限责任公司 | Intelligent electromagnetic coil |
| CN204284593U (en) * | 2014-11-20 | 2015-04-22 | 天津市希思特电子科技有限公司 | High-precision electric final controlling element |
| CN205422842U (en) * | 2016-03-17 | 2016-08-03 | 四川东方电气自动控制工程有限公司 | Steam turbine valve control system based on CAN bus |
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Application publication date: 20181218 |