CN108345263B - Method and system for realizing sequential control of process device - Google Patents
Method and system for realizing sequential control of process device Download PDFInfo
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- CN108345263B CN108345263B CN201711471563.9A CN201711471563A CN108345263B CN 108345263 B CN108345263 B CN 108345263B CN 201711471563 A CN201711471563 A CN 201711471563A CN 108345263 B CN108345263 B CN 108345263B
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- 238000012163 sequencing technique Methods 0.000 description 2
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- 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
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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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
- G05B2219/00—Program-control systems
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- G05B2219/13078—Sequence operation and interlock set programs are separated
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Abstract
The invention provides a method and a system for realizing sequence control of a process device, wherein the method comprises the following steps: and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer; each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer. The invention solves the technical problems that the reproducibility of a sequence control function chart (SFC) control scheme in the prior art is poor and the cause and effect relationship corresponding table (C & E) is difficult to realize complex process steps.
Description
Technical Field
The invention relates to the field of electromechanics, in particular to a method and a system for realizing sequential control of a process device.
Background
For a large-scale process device, because of the large number of devices, the front and rear processes are coupled with each other, and the process device and the device are often required to be strictly controlled in sequence according to the requirements of the process and the device. At present, a distributed control system is adopted as a basic control platform in large-scale process equipment, and the main mode for realizing the sequence control function in the existing distributed control system software platform is a sequence control function chart (SFC) or a cause and effect relationship corresponding table (C & E).
The sequential control function chart (SFC) can meet the sequential control requirements of a large-scale process plant, but has poor reproducibility when the same control scheme of the same equipment is realized, and if one part has a fault, the same control scheme needs to be modified, so that the configuration time is long, and the situations of missed modification and wrong modification are easy to occur.
The cause and effect relationship corresponding table (C & E) is visual and convenient when simple logic is programmed, but process steps with more operations and conditions are often generated in a large process device, the cause and effect table is difficult to realize at the moment, a plurality of external control modules are required to be matched, programming is difficult, understanding is difficult, and later maintenance is not facilitated.
Whether it is a sequence control function chart (SFC) or a cause and effect correspondence table (C & E), it cannot be directly associated with the process when debugging the control scheme, resulting in inconvenient debugging and high requirements on operators.
Disclosure of Invention
Based on the problems, the invention provides a method and a system for realizing sequence control of a process device, which solve the technical problems that the control scheme of a sequence control function chart (SFC) in the prior art has poor reproducibility and a cause-effect relationship correspondence table (C & E) is difficult to realize complex process steps.
The invention provides a sequential control implementation method of a process device, which comprises the following steps:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer.
In addition, the sequential control logic is realized on the upper computer, and when the lower computer needs the sequential control logic, the lower computer downloads the sequential control logic from the upper computer to the lower computer.
In addition, the upper computer is provided with visual field software, and the lower computer is provided with an HMI module and an input/output interface and/or a debugging interface.
In addition, when the lower computer needs the sequence control logic, the lower computer includes from the host computer download sequence control logic to the lower computer on: the upper computer exports the sequence control logic in a file form, and the lower computer downloads the file of the sequence control logic from the upper computer and loads the file into the lower computer.
In addition, if the sequence control logic needs to be modified in the lower computer, the sequence control logic is modified in the lower computer.
In addition, if the upper computer or other lower computers need to load the sequence control logic modified by the lower computer, the sequence control logic is downloaded from the lower computer and covers the sequence control logic in the local computer.
Further, each layer of sequential control logic includes: the main control function block is used for executing sequence control logic of the layer, the coordination scheduling function block is used for scheduling sequence control logic of the next layer, and the interface function block is used for receiving data transmitted from the next layer and/or the same layer and transmitting the data to the upper layer and/or the same layer.
The invention provides a storage medium, which stores computer instructions, and is used for executing any one of the process device sequence control implementation methods when a computer executes the computer instructions.
The invention provides a process device sequence control implementation system, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer.
Through adopting above-mentioned technical scheme, have following beneficial effect:
the invention solves the technical problems that the reproducibility of a sequence control function chart (SFC) control scheme in the prior art is poor and the cause and effect relationship corresponding table (C & E) is difficult to realize complex process steps.
Drawings
FIG. 1 is a flow chart of a process plant sequence control implementation provided by one embodiment of the present invention;
FIG. 2 is a flow chart of a process plant sequence control implementation provided by one embodiment of the present invention;
FIG. 3 is a schematic diagram of single-unit sequencing in a process plant sequencing implementation provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a multiple-device sequence control in a process device sequence control implementation method according to an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments and the attached drawings. It is intended that the present invention not be limited to the particular embodiments disclosed, but that the present invention be limited only by the appended claims.
Referring to fig. 1, the invention provides a sequential control implementation method for a process device, which comprises the following steps:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer.
The invention mainly aims at large-scale process devices, and when the sequence control logic is realized, the sequence control logic level corresponds to the process device level, so that the debugging of operators is convenient. The invention divides the sequence control logic into five layers of an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer according to the layers of the process devices, wherein the equipment function block layer corresponds to the equipment of the process devices, the process unit layer corresponds to the units of the process devices, the single device layer corresponds to the process devices, the multi-device layer corresponds to the workshops of the process devices, and the workshop management interface layer is in network butt joint with the upper management of a factory.
In the sequence control logic, the upper layer sends out an instruction to the next layer, and the next layer feeds back the result to the upper layer after executing the instruction. The sequential control logic may be replicated in the same device.
Mode for comparison of SFC: the SFC has the disadvantage of poor reproducibility, because writing each set of sequential control with the same process using the SFC requires rewriting; the invention can package the same part of the technological process into one or more functional blocks by using the program codes according to the actual situation, and the functional blocks can be directly called without modification after being packaged, and the modification is only a little modification such as the equipment position number corresponding to the outside of the functional block.
Manner of comparison C & E: the C & E has the defect that the C & E can not adapt to a sequence control program with more complex process conditions, because the C & E table has simple logic implementation mode, but the horizontal and vertical lattices can only reflect simple one-to-one correspondence; the module packaged by the invention uses program codes to realize logic, and can flexibly realize various control functions with complicated logic relation.
For cooperation among a plurality of devices, it is necessary to read the state of the next layer by the previous layer, and send a command to the next layer by internal logic judgment of the previous layer.
The method for realizing the sequential control of the process device solves the technical problems that a sequential control function chart (SFC) control scheme in the prior art is poor in reproducibility and complex process steps are difficult to realize by a cause-effect relationship corresponding table (C & E).
Referring to fig. 1 and fig. 2, the invention further provides a method for implementing sequential control of a process apparatus, including:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer.
Optionally, the sequence control logic is implemented on an upper computer, and when the lower computer needs the sequence control logic, the lower computer downloads the sequence control logic from the upper computer to the lower computer.
Because a large-scale process device comprises an upper computer and one or more lower computers, the upper computer and all the lower computers need to be executed according to sequential control logic, and after the upper computer writes programs of the sequential control logic, the programs are copied to other lower computers.
Optionally, the upper computer is provided with visual field software, and the lower computer is provided with a human-machine interface hmi (human machine interface) module, an input-output interface and/or a debugging interface. The input and output interface is arranged on the lower computer to facilitate the operation of operators, and the debugging of the process device and the debugging of the sequence control logic are visualized by arranging the debugging interface.
Optionally, when the lower computer needs the sequential control logic, the step of downloading the sequential control logic from the upper computer to the lower computer by the lower computer includes: the upper computer exports the sequence control logic in a file form, and the lower computer downloads the file of the sequence control logic from the upper computer and loads the file into the lower computer. In order to facilitate the copying of the sequential control logic, the sequential control logic is copied in a file mode.
Optionally, if the sequential control logic needs to be modified in the lower computer, the sequential control logic is modified in the lower computer.
The sequential control logic can be modified on the upper computer or the lower computer, so that problems can be found and modified at any time.
Optionally, if the upper computer or other lower computers need to load a sequence control logic modified by the lower computer, the sequence control logic is downloaded from the lower computer and covers the sequence control logic in the local computer.
The modified sequence control logic can be copied from the upper computer to any lower computer, or from the lower computer to other lower computers, or from the lower computer to the upper computer, and after being copied, the sequence control logic in the local computer is directly covered, so that the sequence control logic is directly executed according to the modified sequence control logic.
Optionally, each layer of the sequential control logic comprises: the main control function block is used for executing sequence control logic of the layer, the coordination scheduling function block is used for scheduling sequence control logic of the next layer, and the interface function block is used for receiving data transmitted from the next layer and/or the same layer and transmitting the data to the upper layer and/or the same layer.
The main control function block type controls the action and the state of equipment according to the process requirements by setting the main control function block type, the coordination scheduling function block type and the interface function block type for each layer; the coordination scheduling function block is responsible for reading the state of the lower layer function block and issuing a command after the logic judgment of the module; the interface function block class is mainly used for receiving production data required by a workshop/factory information system.
As shown in fig. 2, the interface function blocks in the interface function block class sequentially control the scheduling of 8 identical devices.
The embodiment realizes the transmission of the sequential control logic between the upper computer and the lower computers, and an operator only needs to modify one sequential control logic.
Referring to fig. 3, taking the sequential control of a single device as an example, when an upper layer of the sequential control logic sends an instruction to a lower layer, it needs to determine the state of the lower layer first, and send the instruction according to the actual state of the lower layer, there are 3 states in the lower layer, in state 1, it can be switched to state 2 or 3 according to the instruction of the upper layer at any time, but in state 3, it needs to pass through state 2 in order to switch to state 1.
Referring to fig. 4, taking sequential control of multiple devices as an example for explanation, a previous layer of the sequential control logic may acquire working states of multiple next layers, for example, at the same time, only 1 of 3 next-layer modules may be in state 2, and if the remaining two modules are to be switched to state 2, a precedence order may be determined in the previous-layer module according to queuing time, and once the module in state 2 is switched to another state, the module queued in the first other module is preferentially switched to state 2.
The present invention further provides a storage medium, where the storage medium stores computer instructions, and when the computer executes the computer instructions, the storage medium is configured to execute the process device sequence control implementation method according to any one of the above embodiments.
The invention also provides a process device sequence control implementation system, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
Claims (5)
1. A method for realizing sequential control of a process device is characterized by comprising the following steps:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer;
the sequence control logic is realized on the upper computer, and when the lower computer needs the sequence control logic, the lower computer downloads the sequence control logic from the upper computer to the lower computer;
when the lower computer needs the sequence control logic, the lower computer includes from the host computer download sequence control logic to the lower computer: the upper computer exports the sequence control logic in a file form, and the lower computer downloads the file of the sequence control logic from the upper computer and loads the file into the lower computer;
each layer of sequential control logic includes: the system comprises a main control function block type, a coordination scheduling function block type and an interface function block type, wherein the main control function block type is used for executing sequence control logic of the layer, the coordination scheduling function block type is used for scheduling sequence control logic of the next layer, and the interface function block type is used for receiving data transmitted from the next layer and/or the same layer and transmitting the data to the upper layer and/or the same layer;
the upper computer is provided with visual field software, and the lower computer is provided with an HMI module and an input/output interface and/or a debugging interface.
2. The method as claimed in claim 1, wherein the process unit comprises a first chamber and a second chamber,
and if the sequence control logic needs to be modified in the lower computer, modifying the sequence control logic in the lower computer.
3. The method as claimed in claim 2, wherein the process unit comprises a first chamber and a second chamber,
if the upper computer or other lower computers need to load the sequence control logic modified by the lower computer, the sequence control logic is downloaded from the lower computer and covers the sequence control logic in the local computer.
4. A storage medium storing computer instructions for performing the process plant compliance implementation method of any one of claims 1 to 3 when executed by a computer.
5. A process unit sequence control implementation system is characterized by comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to:
and layering the sequential control logic according to the layers of the process device, wherein the layering sequentially comprises the following steps from bottom to top: the system comprises an equipment function block layer, a process unit layer, a single device layer, a multi-device layer and a workshop management interface layer;
each layer of the sequential control logic realizes the action of the entity equipment in the corresponding process device of the layer, and the next layer receives the instruction sent by the previous layer and feeds back the result of executing the instruction to the previous layer;
the sequence control logic is realized on the upper computer, and when the lower computer needs the sequence control logic, the lower computer downloads the sequence control logic from the upper computer to the lower computer;
when the lower computer needs the sequence control logic, the lower computer includes from the host computer download sequence control logic to the lower computer: the upper computer exports the sequence control logic in a file form, and the lower computer downloads the file of the sequence control logic from the upper computer and loads the file into the lower computer;
each layer of sequential control logic includes: the system comprises a main control function block type, a coordination scheduling function block type and an interface function block type, wherein the main control function block type is used for executing sequence control logic of the layer, the coordination scheduling function block type is used for scheduling sequence control logic of the next layer, and the interface function block type is used for receiving data transmitted from the next layer and/or the same layer and transmitting the data to the upper layer and/or the same layer;
the upper computer is provided with visual field software, and the lower computer is provided with an HMI module and an input/output interface and/or a debugging interface.
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| FI930877A7 (en) * | 1992-11-30 | 1994-05-31 | Pfu Ltd | Maongsidigt produktionssystem och metod Foer anvaendning av detta |
| CN203025527U (en) * | 2012-11-20 | 2013-06-26 | 常州数控技术研究所 | Open type numerical control system |
| CN102914998B (en) * | 2012-11-20 | 2018-03-09 | 常州数控技术研究所 | The axle digital control system in open type of built-in small four |
| CN103441570A (en) * | 2013-06-18 | 2013-12-11 | 国家电网公司 | One-button type sequential control operation control method based on integrated information platform |
| CN105700465A (en) * | 2014-11-26 | 2016-06-22 | 中国科学院沈阳自动化研究所 | Robot compliance control system and method based on EtherCAT bus |
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