CN106292515B - A kind of communication instruction executive mode of programmable controller - Google Patents
A kind of communication instruction executive mode of programmable controller Download PDFInfo
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- CN106292515B CN106292515B CN201610769215.9A CN201610769215A CN106292515B CN 106292515 B CN106292515 B CN 106292515B CN 201610769215 A CN201610769215 A CN 201610769215A CN 106292515 B CN106292515 B CN 106292515B
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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
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- Automation & Control Theory (AREA)
- Communication Control (AREA)
- Programmable Controllers (AREA)
Abstract
The invention discloses a kind of communication instruction executive modes of programmable controller, including establishing a communication instruction execution table to communication port, the communication instruction execution table, which is equipped with instruction, to be allowed to execute mark and instruction execution complement mark, PLC program scan procedure A scans PLC program and executes, when communication instruction is arrived in scanning, corresponding communication instruction is searched in the communication instruction executive table, according to the enable end state of the communication instruction in a program, (Yes expression allows the communication instruction to execute, No expression does not allow the communication instruction to execute), the instruction being incorporated in the communication instruction executive table allows to execute mark and whether instruction execution complement mark comprehensive judgement modifies described instruction and allow to execute mark, and read instruction execution result and instruction errors code, it is held simultaneously using an individual communication instruction Communication instruction described in traveling journey B scan round executes table, allows to execute mark according to the instruction in the communication instruction execution table and determines whether to execute the instruction, the PLC program scan procedure A and the communication instruction executive process B asynchronous parallel are run.
Description
Technical field
The present invention relates to programmable controller field more particularly to a kind of communication instruction sides of execution of programmable controller
Formula.
Background technique
Every kind of programmable controller (PLC) has respective communication instruction, they set dependent on communication instruction with third party
Standby communication, the communication instruction executive mode of existing PLC mainly use following executive mode: A is to PLC for PLC program scan procedure
Program scanning executes, when scanning is to a communication instruction, if communication port is idle and there is electricity in the communication instruction enable end,
Execute the communication instruction；Otherwise, it skips the communication instruction and continues to scan on next instruction of execution.Since the execution of communication instruction is
One independence and the longer process that compares, when executing communication instruction, it needs to be ready for sending command frame, it is needed after transmission
The response of slave devices is waited, the data etc. of slave devices response are handled, and PLC program is that scan round executes, and works as PLC
If scan to a communication instruction and meet executable condition, program does not wait for the entire logical of this communication instruction
News process terminates, but then scanning executes next instruction.
The defect of this communication instruction executive mode is:
1, communication efficiency is low, if PLC program scan period 30ms, then may between 2 communication instructions execute
Generate the interval time of a scan period；
2, programming is complicated, needs the timing of user's communication control instruction execution in a program, and works as communication instruction
When executing unsuccessful, being unable to intuitive judgment is because programmed logic problem or communication instruction itself problem cause；
3, when more slaves communicate (a plurality of communication instruction), it is unable to ensure having equal opportunities for all communication instructions execution,
Program scanning period and communication instruction execute in the case that the period couples, there are communication instruction never have chance and held
Row.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of communication instruction of programmable controller is provided
Executive mode.
To achieve the above object, the invention adopts the following technical scheme:
A kind of communication instruction executive mode of programmable controller a, comprising: communication instruction is established to communication port and is executed
Table, the communication instruction execution table, which is equipped with instruction, to be allowed to execute mark and instruction execution complement mark, PLC program scan procedure A
PLC program is scanned and is executed, when communication instruction is arrived in scanning, searches corresponding communication in the communication instruction executive table
Instruction, according to the enable end state of the communication instruction in a program, (Yes expression allows the communication instruction to execute, and No expression is not permitted
Perhaps the communication instruction executes), the last time instruction being incorporated in the communication instruction executive table allows to execute mark and instruction is held
Whether row complement mark comprehensive judgement, which modifies described instruction, allows to execute mark, while being executed using an individual communication instruction
Communication instruction described in process B scan round executes table, allows to execute mark according to the instruction in the communication instruction execution table and sentences
Fixed whether to execute the instruction, the PLC program scan procedure A and the communication instruction executive process B asynchronous parallel are run.
Further, PLC program scan procedure A scans PLC program and executes, when communication instruction is arrived in scanning, if
The enable end state of the communication instruction in a program is No, if the instruction in the communication instruction executive table allows to execute mark
For No, then keeping instruction to allow to execute mark is No；If the instruction in the communication instruction executive table allows to execute mark
When Yes and instruction execution complement mark are No, keeping instruction to allow to execute mark is Yes；If the communication instruction executes table
When it is Yes that instruction in lattice, which allows to execute and indicate, and instruction execution complement mark is Yes, then modifying instruction allows to execute mark
For No.
Further, PLC program scan procedure A scans PLC program and executes, when communication instruction is arrived in scanning, if
The enable end state of the communication instruction in a program is Yes, and the instruction modified in the communication instruction executive table allows to execute
Mark is Yes.
Further, when the communication instruction executive process B executes table progress scan round to the communication instruction, if institute
Stating communication instruction allows running mark to be Yes, then runs the communication instruction and modify the instruction execution after instructing end of run
Complement mark is Yes；If the communication instruction allows running mark to be No, then skips and continue to scan on next.
Further, the communication instruction execution table further includes instruction execution result and instruction errors code, the communication
Instruction execution result and instruction errors code are filled in after the completion of instruction execution.
Further, when the communication port is multiple communication ports, the instruction execution table of each communication port is combinable at one
Total communication instruction executes table.
After adopting the above technical scheme, compared with the background technology, the present invention, having the advantages that
1, communication efficiency is high: executing communication instruction by individual communication instruction executive process B scan round and executes in table
Communication instruction, communication instruction execute between without the free time, a communication instruction is finished, automatically scanning lower；
2, programming is simple, and without carrying out timing control to communication instruction, all communication instructions can be on program
It is parallel to obtain electric execution, as long as checking whether communication instruction itself is correct when communication instruction executes unsuccessful, with programmed logic
It is unrelated；
3, when more slaves communicate (a plurality of communication instruction), it is ensured that all communication instructions executed has equal opportunities；
4, it can correctly be executed in the case where communication instruction requires only that energy edging trigger executes primary.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment
A kind of communication instruction executive mode of programmable controller a, comprising: communication instruction is established to communication port and is executed
Table, the communication instruction execution table, which is equipped with instruction, to be allowed to execute mark and instruction execution complement mark, PLC program scan procedure A
PLC program is scanned and is executed, when communication instruction is arrived in scanning, searches corresponding communication in the communication instruction executive table
Instruction, according to the enable end state of the communication instruction in a program, (Yes expression allows the communication instruction to execute, and No expression is not permitted
Perhaps the communication instruction executes), the last time instruction being incorporated in the communication instruction executive table allows to execute mark and instruction is held
Whether row complement mark comprehensive judgement, which modifies described instruction, allows to execute mark, and reads instruction execution result and instruction errors generation
Code, while table is executed using communication instruction described in an individual communication instruction executive process B scan round, according to the communication
Instruction in instruction execution table allows to execute mark and determines whether to execute the instruction, and the PLC program scan procedure A leads to described
Interrogate the operation of instruction execution process B asynchronous parallel.
Following table is the communication instruction executive table of certain communication port:
" COMM " indicates free protocol instruction in table, and " MODR " indicates that Modbus agreement reads instruction, " MODW " table
Showing indicates Modbus agreement write instruction, when the A sweep of PLC program scan procedure is to the 3rd article of communication instruction MODW, if MODW
" instruction allows to execute mark " that instruction enable end has electricity (Yes indicate allow to execute) then to modify the MODW instruction in table be
Yes；Need that " instruction allows to execute mark according to original if the instruction enable end MODW is without electricity (No indicate do not allow to execute)
Will " is handled, if original " instruction allows to execute mark " is No, that modifies the MODW instruction in table " instructs permission
Execute mark " it is No；If " instruction allows to execute mark " originally is Yes and " instruction execution complement mark " is Yes (former
To allow to execute and execute completion) then modify in table MODW instruction " instruction allows to execute mark " be No；If former
" instruction allows to execute mark " come is Yes and " instruction execution complement mark " is that No (allows to execute still not yet originally
Execute) it does not modify then, being kept for " instruction allows to execute mark " of the MODW instruction in table is Yes.
When the communication instruction executive process B is scanned the communication instruction execution table, if the communication instruction is permitted
Perhaps running mark is Yes, then executing the communication instruction, (initiating communications mouth sends command frame, slave response, processing is waited to answer
Answer returned data etc.), and modifying the instruction execution complement mark after instructing end of run is Yes, fills in instruction execution result
With instruction errors code.Communication success or failure can be known according to instruction execution result, i.e. according to instruction errors code
The reason of road fails；If the communication instruction allows running mark to be No, then skips and continue to scan on next.
It, also can be combinable total at one by the instruction execution table of each communication port when the communication port is multiple communication ports
Communication instruction executes table.
Following table is total communication instruction executive table of all communication ports:
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (6)
1. a kind of communication instruction executive mode of programmable controller characterized by comprising establish a communication to communication port
Instruction execution table, the communication instruction executive table, which is equipped with instruction, to be allowed to execute mark and instruction execution complement mark, PLC journey
Sequence scan procedure A scans PLC program and executes, and when communication instruction is arrived in scanning, looks into the communication instruction executive table
Corresponding communication instruction is looked for, according to the enable end state of the communication instruction in a program, wherein Yes expression allows the communication to refer to
It enables and executing, No expression does not allow the communication instruction to execute, and the instruction being incorporated in the communication instruction executive table allows to execute
Whether mark and instruction execution complement mark comprehensive judgement, which modify described instruction, allows to execute mark, while individually using one
Communication instruction executive table described in communication instruction executive process B scan round, according to the finger in the communication instruction executive table
Order allows to execute mark and determines whether to execute the instruction, the PLC program scan procedure A and the communication instruction executive process B
Asynchronous parallel operation.
2. a kind of communication instruction executive mode of programmable controller according to claim 1, it is characterised in that: PLC journey
Sequence scan procedure A scans PLC program and executes, when scanning is to communication instruction, if the communication instruction making in a program
Energy end state is No, then: if it is No that the instruction in the communication instruction executive table, which allows to execute mark, keeping instructing allows
Executing mark is No；If the instruction in the communication instruction executive table allows to execute, mark is Yes and instruction execution is completed
When mark is No, keeping instruction to allow to execute mark is Yes；If the instruction in the communication instruction executive table allows to execute mark
When will is Yes and instruction execution complement mark is Yes, then modifying instruction to allow to execute mark is No.
3. a kind of communication instruction executive mode of programmable controller according to claim 1, it is characterised in that: PLC journey
Sequence scan procedure A scans PLC program and executes, when scanning is to communication instruction, if the communication instruction making in a program
Energy end state is Yes, and modifying the instruction in the communication instruction executive table to allow to execute mark is Yes.
4. a kind of communication instruction executive mode of programmable controller according to claim 1, it is characterised in that: described logical
When interrogating instruction execution process B to communication instruction executive table progress scan round, if the communication instruction allows to execute mark
Will is Yes, then running the communication instruction and modifying the instruction execution complement mark after instructing end of run is Yes；If described
It is No that communication instruction, which allows to execute mark, then skips and continue to scan on next.
5. a kind of communication instruction executive mode of programmable controller according to claim 1, it is characterised in that: described logical
News instruction execution table further includes instruction execution result and instruction errors code, and the communication instruction fills in instruction after the completion of executing
Implementing result and instruction errors code.
6. a kind of communication instruction executive mode of programmable controller according to claim 1, it is characterised in that: when described
When communication port is multiple communication ports, the communication instruction executive table of each communication port is combinable to execute table at a total communication instruction
Lattice.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610769215.9A CN106292515B (en) | 2016-08-30 | 2016-08-30 | A kind of communication instruction executive mode of programmable controller |
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| CN201610769215.9A CN106292515B (en) | 2016-08-30 | 2016-08-30 | A kind of communication instruction executive mode of programmable controller |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1185233A (en) * | 1998-07-06 | 1999-03-30 | Mitsubishi Electric Corp | Programmable controller |
| EP1134634A2 (en) * | 2000-03-15 | 2001-09-19 | Omron Corporation | Programmable controller |
| CN1620015A (en) * | 2003-11-20 | 2005-05-25 | 欧姆龙株式会社 | Communication interface, network system and programmable controller |
| CN102540952A (en) * | 2010-12-09 | 2012-07-04 | 通用电气公司 | Programmable controller and operation method thereof |
| CN105172081A (en) * | 2015-09-23 | 2015-12-23 | 上海大学 | Method for achieving combined control over vacuum casting device based on VB and Mitsubishi FX type PLC programming port communication |
-
2016
- 2016-08-30 CN CN201610769215.9A patent/CN106292515B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1185233A (en) * | 1998-07-06 | 1999-03-30 | Mitsubishi Electric Corp | Programmable controller |
| EP1134634A2 (en) * | 2000-03-15 | 2001-09-19 | Omron Corporation | Programmable controller |
| CN1620015A (en) * | 2003-11-20 | 2005-05-25 | 欧姆龙株式会社 | Communication interface, network system and programmable controller |
| CN102540952A (en) * | 2010-12-09 | 2012-07-04 | 通用电气公司 | Programmable controller and operation method thereof |
| CN105172081A (en) * | 2015-09-23 | 2015-12-23 | 上海大学 | Method for achieving combined control over vacuum casting device based on VB and Mitsubishi FX type PLC programming port communication |
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| CN106292515A (en) | 2017-01-04 |
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