CN109542648A - A kind of method and device of striding course communication - Google Patents
A kind of method and device of striding course communication Download PDFInfo
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- CN109542648A CN109542648A CN201811404716.2A CN201811404716A CN109542648A CN 109542648 A CN109542648 A CN 109542648A CN 201811404716 A CN201811404716 A CN 201811404716A CN 109542648 A CN109542648 A CN 109542648A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/54—Interprogram communication
- G06F9/544—Buffers; Shared memory; Pipes
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Abstract
This application discloses a kind of method and devices of striding course communication, memory sharing area is established by the first process, it can be read by the first process behind the instruction write-in memory sharing area of second process and be sent to PLC, the first process is sent result to again after PLC response instruction, memory sharing area is written by the first process again, the second process reads the PLC response results in memory sharing area.The technical solution of the application is using the memory sharing area of the first process and its foundation as medium, realize that the striding course between the second process and PLC communicates, 64 communication between upper computer software and PLC is realized, limitation when PLC is communicated with upper computer software is reduced.In addition, establishing memory sharing area by way of File Mapping, the expense of entire communication system is also reduced, helps to promote software performance.
Description
Technical field
This application involves the method and devices that field of computer technology more particularly to a kind of striding course communicate.
Background technique
In industrial circle, many applications selections Mitsubishi PLC (Programmable Logic Controller) with it is upper
Position machine software carries out communication cooperation, completes normal production line traffic control.Mitsubishi PLC is used for using a kind of programmable memory
Its internally stored program executes the user oriented instructions such as logical operation, sequential control, timing, counting and arithmetical operation, and leads to
Cross number or the various types of mechanical or production processes of analog pattern input/output control.Host computer, which refers to, can directly issue behaviour
Control the computer of order.
In general, the communication process between host computer and Mitsubishi PLC is: host computer issues manipulation instruction, Mitsubishi to Mitsubishi PLC
PLC receives instruction and completes the control of production line according to instruction.However, Mitsubishi PLC can not with all upper computer softwares into
Row communication, under Win7X32 system, Mitsubishi PLC can be communicated with upper computer software, but because some drivings of Mitsubishi PLC
Model does not support 64 systems, therefore under Win7X64 system, and Mitsubishi PLC and upper computer software are unable to direct communication, this just makes
It obtains when Mitsubishi PLC is communicated with upper computer software and has some limitations.
Therefore, communicate Mitsubishi PLC with 64 host computers, become those skilled in the art and urgently solve
Certainly the problem of.
Summary of the invention
This application provides a kind of striding course communication method and device, with solve current Mitsubishi PLC can not with 64 on
The problem of position machine is communicated.
On the one hand, this application provides a kind of methods of striding course communication, comprising:
For second process to the write-in plc communication instruction of memory shared region, second process is soft for indicating 64 host computers
The execution of part, the memory sharing area is established by the first process, and first process is for indicating holding for 32 upper computer softwares
Row；
First process reads the plc communication instruction from the memory sharing area and is sent to PLC；
The PLC responds the plc communication instruction, generates feedback result, and the feedback result includes instruction execution success
Or instruction execution failure；
The memory sharing area is written in the PLC feedback result by first process；
Second process reads the feedback result from the memory sharing area.
With reference to first aspect, before second process is instructed to memory shared region write-in plc communication, further includes:
First process described in second Process flowchart is opened；
First process establishes the memory sharing area in the way of File Mapping.
Further, second process is to after the write-in plc communication instruction of memory shared region, further includes: Xiang Suoshu the
One process sends the first synchronization signal.
Further, it is total from the memory according to first synchronization signal that the method also includes: first processes
It enjoys area's reading plc communication instruction and is sent to PLC.
Further, the PLC feedback result is written after the memory sharing area first process, further includes:
First process sends the second synchronization signal to second process.
Further, it is total from the memory according to second synchronization signal that the method also includes: second processes
It enjoys area and reads the feedback result.
With reference to first aspect, the method also includes:
Process open command is written to the memory sharing area in second process；
First process reads the process open command from the memory sharing area；
First process is disconnected and is exited with the PLC according to the process open command.
Further, the step of first process establishes the memory sharing area in the way of File Mapping include:
Create file-mapping object；
The file-mapping object is mapped in the first process；
Finger by being directed toward file-mapping object carries out data access for memory shared region.
Second aspect, the application also provide a kind of device of striding course communication, comprising:
First writing unit, for plc communication instruction to be written to memory shared region for the second process, second process is used
In the execution for indicating 64 upper computer softwares, the memory sharing area is established by the first process, and first process is for indicating
The execution of 32 upper computer softwares；
First reading unit is sent to for reading the plc communication instruction from the memory sharing area for the first process
PLC；
PLC response unit generates feedback result, the feedback knot for responding the plc communication instruction for the PLC
Fruit includes instruction execution success or instruction execution failure；
Second writing unit, for the memory sharing area to be written in the PLC feedback result for first process；
Second reading unit, for reading the feedback result from the memory sharing area for second process.
From the above technical scheme, the embodiment of the present application provides a kind of method and device of striding course communication, passes through
First process establishes memory sharing area, can be read and is sent to by the first process behind the instruction write-in memory sharing area of the second process
The first process is sent result to again after PLC, PLC response instruction, and memory sharing area, the second process are written by the first process again
Read the PLC response results in memory sharing area.The technical solution of the application is by the first process and its memory sharing area of foundation
As medium, realizes that the striding course between the second process and PLC communicates, that is, realize 64 between upper computer software and PLC
Communication reduces limitation when PLC is communicated with upper computer software.In addition, memory sharing area is established by way of File Mapping,
The expense of entire communication system is also reduced, helps to promote software performance.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, attached drawing needed in case study on implementation will be made below
Simply introduce, it should be apparent that, for those of ordinary skills, in the premise of not making the creative labor property
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the method for striding course communication provided by the embodiments of the present application；
Fig. 2 is the flow chart of the method for second of striding course provided by the embodiments of the present application communication；
Fig. 3 is the flow chart of the method for the third striding course provided by the embodiments of the present application communication；
Fig. 4 is the flow chart of the method for the 4th kind of striding course provided by the embodiments of the present application communication；
Fig. 5 is the flow chart of the method for the 5th kind of striding course provided by the embodiments of the present application communication；
Fig. 6 is the flow chart of step 202 provided by the embodiments of the present application；
Fig. 7 is a kind of structural block diagram of the device of striding course communication provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with attached drawing, it is right
Technical solution in the embodiment of the present application is clearly and completely described.
Referring to Fig. 1, this application provides a kind of methods of striding course communication, comprising:
Step 101, the second process is to the write-in plc communication instruction of memory shared region, and second process is for indicating 64
The execution of upper computer software, the memory sharing area is established by the first process, and first process is for indicating 32 host computers
The execution of software；Process is program in computer about the primary operation activity on certain data acquisition system, is that system carries out resource
The basic unit of distribution and scheduling, is the basis of operating system configuration, and program is the description of instruction, data and its organizational form,
Process is exactly the entity of program.The execution activity of upper computer software is indicated in the application with process.Due to 64 upper computer softwares
It can not be with PLC direct communication, that is the second process can not directly send an instruction to PLC, and technical scheme is to understand
Certainly this problem is provided with 32 upper computer softwares at 64, is risen using 32 upper computer softwares between upper computer software and PLC
It is acted on to transfer, the instruction of 64 upper computer softwares is sent to PLC and is executed.
But the first process not is the direct instruction for receiving the second process and sending, but builds in advance when transfer instructs
A memory sharing area is found, after instruction is deposited into memory sharing area by the second process, the first process is again from memory sharing area
Read out instruction.
In addition, the activity of the first process in the application may be embodied among the activity of the second process, for example, second into
Include the program segment of the first process in the program of journey, the second process program execute when can sequentially go to starting first into
The program of journey can ensure that after the second process initiation, the first process can timely establish memory sharing area in this way.
Step 102, the first process reads the plc communication instruction from the memory sharing area and is sent to PLC；In fact,
Reading data of process and to write data all carried out in this block memory sharing area, read-write process is exactly one to internal storage data
It is simple to obtain and be arranged.Memory sharing area is some internal storage locations of system distribution, because being that system is distributed, it cannot be guaranteed that
Whether these internal storage locations remain other data, so generally will do it initialization operation, after having carried out initialization operation,
Second process just writes the instruction into.Wherein, plc communication instruction can specifically be divided into following several: communication connection instruction, communication are disconnected
Instruction, data read command and data write instruction are opened, communication connection instruction is for establishing the communication link between PLC and host computer
Connect, communication open command is used to disconnect communication connection between PLC and host computer, data read command for control host computer from
PLC reads data, and data write instruction writes data into PLC for controlling host computer.
Step 103, the PLC responds the plc communication instruction, generates feedback result, and the feedback result includes instruction
It executes failure or runs succeeded and corresponding reading numerical values；The result that PLC is fed back is instructed to above-mentioned plc communication in fact
Response.Overall 2 classes that are divided into of this response: the first kind is that communication connection, disconnection, data are written with the response of these instructions, is rung
The result answered is exactly that whether running succeeded, ture is returned if running succeeded, and returns to false if executing failure；Second
Class is the response to instruction is read, if run succeeded, the value for returning to true and reading, for example the value read is
255, if executing failure, false is returned to, the value read at this time is default value, for example sets 0 for default value.
Step 104, the memory sharing area is written in the PLC feedback result by first process；Since PLC can not be with
Direct communication between second process, the second process needs first to write the instruction into memory sharing area when sending instructions, so PLC is being returned
It is also required to first be written feedback result in memory sharing area when returning result, second process of waiting is therefrom read.
Step 105, second process reads the feedback result from the memory sharing area, when the second process is read
When the feedback result of PLC, illustrate that the communication process of this second process and PLC are over.It can choose later and continue to communicate
Or exit communication.
According to the above it is found that embodiments herein provides a kind of method of striding course communication, by the first process
And its memory sharing area established realizes that the striding course between the second process and PLC communicates, that is, realizes on 64 as medium
Communication between position machine software and PLC reduces limitation when PLC is communicated with upper computer software.
Referring to fig. 2, the method for striding course communication provided by the present application, before step 101, further includes:
Step 201, the first process described in second Process flowchart is opened；Control of second process for the first process,
It can be the control in terms of software program, the execution program of the first process can be a part in the second process program, when
When two process programs go to the first process corresponding program segment, start the first process, the first process begins setting up memory at this time
Shared region.
Step 202, first process establishes the memory sharing area in the way of File Mapping.
Therefore, the method for the striding course communication in the embodiment of the present application establishes memory sharing by the way of File Mapping
Area reduces the expense of entire communication system, helps to promote software performance.
Referring to Fig. 3, the method for striding course communication provided by the present application, after step 101, further includes:
Step 301, the first process of Xiang Suoshu sends the first synchronization signal.It is total that memory has been write the instruction into the second process
After enjoying area, the first process is not aware that the second process has been completed that this is operated, and also cannot know when from memory sharing area
The parameter that a delay is read can generally also be arranged to the first process reading data, but be delayed reading for middle reading instruction
Operation can be interfered by many uncertain factors, for example the second process occurs the wrong memory that do not write the instruction into the process of implementation and is total to
Area is enjoyed, the first process can not also read out instruction when time is up；For another example, the time setting of delay is too long, even if the
One process read data, can also waste the time largely waited, if the time of delay is too short, it is also possible in the second process
The first process has begun to read operation before write instruction.Above situation, when the operation that entire write-in is read can waste very much
Between, cause unnecessary waiting or reading result mistake.Therefore, plc communication is instructed in write-in in the second process in the application
After depositing shared region, a synchronization signal will be sent and improved whole to the first process with notifying the first process to read instruction at once
The efficiency of a control process.Synchronization signal also guarantees that the first process synchronous can be carried out with the second process, but in the application
This synchronization is also the time difference with very little.
Step 302, first process reads the PLC from the memory sharing area according to first synchronization signal and leads to
Letter instruction is sent to PLC.
Further, the simultaneously operating in the application between the first process and the second process is by event control, thing here
Part is a kind of mechanism, refers to a kind of mode synchronized between process.In the technical solution of the application, case mechanism is utilized
The specific practice synchronize between first process and the second process is: two events of setting, refers respectively to enable and completes thing
Part and response completion event.Instruction completion event is initially no signal condition, and the second process is after being written data toward shared region
Instruction completion event signal transition is set to, the first process is only detecting that instruction completion event is to have the state of signal
Under, Cai Huiqu memory sharing area reads data.After the completion of reading, instruction completion event is restored to no signal condition；Similarly, it rings
Event initial bit no signal condition is answered, the first process completes response after data are written toward shared region to be set to signal transition,
For second process only in the state that detecting response completion event is to have signal, Cai Huiqu memory sharing area reads data.It reads
After the completion of taking, response completion event is restored to no signal condition.
As it can be seen from the above scheme striding course communication means provided by the embodiments of the present application, in the second process by control instruction
It is written after memory sharing area, sends a synchronization signal to the first process, the first process receives synchronization signal later from interior
It deposits and reads instruction in shared region.What synchronization signal can guarantee the first process and the second process executes sequence, guarantee second into
After journey write instruction, the first process is just read；In addition, if the second process executes mistake and at this time will not without write instruction
Issuing synchronization signal notifies the first process to read, and avoids the invalid operation of the first process.
Referring to fig. 4, the method for striding course communication provided by the present application, after step 104, further includes:
Step 401, first process sends the second synchronization signal to second process.Usual second process is not known simultaneously
Whether the first process of road by feedback result is written with memory sharing area, when the first process by feedback result write-in memory sharing area it
Afterwards, the second process is also not know when to read, so feedback result is written in the first process in the technical solution of the application
After memory sharing area, it is sent immediately to one synchronization signal of the second process, notifies the second process that can be read, this
Sample also can guarantee the waste waiting time that the entire operation for being written and reading will not be excessive, improve the efficiency of integrated operation.
Step 402, second process reads the feedback from the memory sharing area according to second synchronization signal
As a result.When the second process reads the feedback result of PLC, illustrate that the communication process of this second process and PLC are over.
It can choose later and continue to communicate or exit communication.
As it can be seen from the above scheme in striding course communication means provided by the present application, in the first process by the feedback result of PLC
It is written after memory sharing area, also a synchronization signal is sent to the second process, to remind the second process to read in time instead
Feedback is as a result, improve the efficiency of operation.
Referring to Fig. 5, when the communication between host computer and PLC is completed, host computer needs to disconnect the connection with PLC, so
The method of striding course communication further include:
Step 501, process open command is written to the memory sharing area in second process；Whether the second process is sent out
What instruction out is, all can not directly and plc communication, the first process play the role of transfer, therefore, when needing to disconnect second
When the connection of process and PLC, it is only necessary to control the separated communication of the first process Yu PLC.At this point, the second process there is still a need for
Memory sharing area is written in the instruction that the process of control is disconnected, and sends synchronization signal to the first process at once later.
Step 502, after receiving synchronization signal, the first process reads the process disconnection from the memory sharing area and refers to
It enables；
Step 503, first process is disconnected and is exited with the PLC according to the process open command.First
After process and PLC are disconnected, that is, indicates that the second process is also disconnected with PLC and connect.
As it can be seen from the above scheme when the application the second process need with PLC disconnect when, it is only necessary to control first into
Journey and PLC are disconnected, and are no longer needed to and plc communication.
Referring to Fig. 6, the step 202, the first process establishes the step in the memory sharing area in the way of File Mapping
Suddenly include:
Step 601, file-mapping object is created；
Step 602, the file-mapping object is mapped in the first process；
Step 603, data access is carried out for memory shared region by being directed toward the finger of file-mapping object.
From the above technical scheme, the embodiment of the present application provides a kind of method of striding course communication, by first into
PLC can be read and are sent to Cheng Jianli memory sharing area, the instruction of the second process by the first process after memory sharing area is written,
The first process is sent result to again after PLC response instruction, memory sharing area is written by the first process again, the second process is read
PLC response results in memory sharing area.The technical solution of the application using the memory sharing area of the first process and its foundation as
Medium realizes that the striding course between the second process and PLC communicates, that is, realizes 64 communication between upper computer software and PLC,
Reduce limitation when PLC is communicated with upper computer software.In addition, establishing memory sharing area by way of File Mapping, also drop
The low expense of entire communication system helps to promote software performance.
Referring to Fig. 7, the embodiment of the present application provides a kind of device of striding course communication, comprising:
First writing unit 71, for plc communication instruction, second process to be written to memory shared region for the second process
For indicating the execution of 64 upper computer softwares, the memory sharing area is established by the first process, and first process is used for table
Show the execution of 32 upper computer softwares；
First reading unit 72 is sent for reading the plc communication instruction from the memory sharing area for the first process
To PLC；
PLC response unit 73 generates feedback result, the feedback for responding the plc communication instruction for the PLC
It as a result include instruction execution success or instruction execution failure；
Second writing unit 74, for the memory sharing area to be written in the PLC feedback result for first process；
Second reading unit 75, for reading the feedback result from the memory sharing area for second process.
Optionally, described device further include:
Control unit, for being opened for the first process described in second Process flowchart；
Shared region establishes unit, for establishing the memory sharing in the way of File Mapping for first process
Area.
Optionally, described device further include: the first signal transmitting unit, it is synchronous for sending first to first process
Signal.
Optionally, described device further include: the first signal-obtaining unit, for being first process according to described first
Synchronization signal reads the plc communication instruction from the memory sharing area and is sent to PLC.
Optionally, described device further include: second signal transmission unit, for for first process to described second into
Journey sends the second synchronization signal.
Optionally, described device further include: second signal reading unit, for being second process according to described second
Synchronization signal reads the feedback result from the memory sharing area.
Optionally, described device further include:
Third writing unit, for process open command to be written to the memory sharing area for second process；
Third reading unit, for reading the process open command from the memory sharing area for first process；
Response unit is exited, for disconnecting according to the process open command with the PLC for first process
And it exits.
Optionally, the shared region is established unit and is also used to:
Create file-mapping object；
The file-mapping object is mapped in the first process；
Finger by being directed toward file-mapping object carries out data access for memory shared region.
From the above technical scheme, the embodiment of the present application provides a kind of method and device of striding course communication, passes through
First process establishes memory sharing area, can be read and is sent to by the first process behind the instruction write-in memory sharing area of the second process
The first process is sent result to again after PLC, PLC response instruction, and memory sharing area, the second process are written by the first process again
Read the PLC response results in memory sharing area.The technical solution of the application is by the first process and its memory sharing area of foundation
As medium, realizes that the striding course between the second process and PLC communicates, that is, realize 64 between upper computer software and PLC
Communication reduces limitation when PLC is communicated with upper computer software.In addition, memory sharing area is established by way of File Mapping,
The expense of entire communication system is also reduced, helps to promote software performance.
The application can be used in numerous general or special purpose computing system environments or configuration.Such as: personal computer, service
Device computer, handheld device or portable device, laptop device, multicomputer system, microprocessor-based system, top set
Box, programmable consumer-elcetronics devices, network PC, minicomputer, mainframe computer, including any of the above system or equipment
Distributed computing environment etc..
The application can describe in the general context of computer-executable instructions executed by a computer, such as program
Module.Generally, program module includes routines performing specific tasks or implementing specific abstract data types, programs, objects, group
Part, data structure etc..The application can also be practiced in a distributed computing environment, in these distributed computing environments, by
Task is executed by the connected remote processing devices of communication network.In a distributed computing environment, program module can be with
In the local and remote computer storage media including storage equipment.
Those skilled in the art will readily occur to its of the application after considering specification and practicing application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (9)
1. a kind of method of striding course communication characterized by comprising
Second process is to the write-in plc communication instruction of memory shared region, and second process is for indicating 64 upper computer softwares
It executes, the memory sharing area is established by the first process, and first process is used to indicate the execution of 32 upper computer softwares；
First process reads the plc communication instruction from the memory sharing area and is sent to PLC；
The PLC responds the plc communication instruction, generates feedback result, and the feedback result includes instruction execution success or refers to
Order executes failure；
The memory sharing area is written in the PLC feedback result by first process；
Second process reads the feedback result from the memory sharing area.
2. the method according to claim 1, wherein plc communication is written to memory shared region in second process
Before instruction, further includes:
First process described in second Process flowchart is opened；
First process establishes the memory sharing area in the way of File Mapping.
3. according to the method described in claim 2, it is characterized in that, plc communication is written to memory shared region in second process
After instruction, further includes: the first process of Xiang Suoshu sends the first synchronization signal.
4. according to the method described in claim 3, it is characterized in that, the method also includes: first process is according to
First synchronization signal reads the plc communication instruction from the memory sharing area and is sent to PLC.
5. according to the method described in claim 2, it is characterized in that, institute is written in the PLC feedback result by first process
After stating memory sharing area, further includes: first process sends the second synchronization signal to second process.
6. according to the method described in claim 5, it is characterized in that, the method also includes: second process is according to
Second synchronization signal reads the feedback result from the memory sharing area.
7. the method according to claim 1, wherein the method also includes:
Process open command is written to the memory sharing area in second process；
First process reads the process open command from the memory sharing area；
First process is disconnected and is exited with the PLC according to the process open command.
8. according to the described in any item methods of claim 2-6, which is characterized in that first process utilizes the side of File Mapping
Formula establishes the step of memory sharing area and includes:
Create file-mapping object；
The file-mapping object is mapped in the first process；
Finger by being directed toward file-mapping object carries out data access for memory shared region.
9. a kind of device of striding course communication characterized by comprising
First writing unit, for plc communication instruction to be written to memory shared region for the second process, second process is used for table
Show the execution of 64 upper computer softwares, the memory sharing area is established by the first process, and first process is for indicating 32
The execution of upper computer software；
First reading unit is sent to PLC for reading the plc communication instruction from the memory sharing area for the first process；
PLC response unit generates feedback result, the feedback result packet for responding the plc communication instruction for the PLC
Include instruction execution success or instruction execution failure；
Second writing unit, for the memory sharing area to be written in the PLC feedback result for first process；
Second reading unit, for reading the feedback result from the memory sharing area for second process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111813566A (en) * | 2019-04-30 | 2020-10-23 | 厦门雅基软件有限公司 | Cross-process dragging method, device, equipment and computer readable storage medium |
| CN111813566B (en) * | 2019-04-30 | 2023-01-31 | 厦门雅基软件有限公司 | Cross-process dragging method, device, equipment and computer readable storage medium |
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