CN105988411A - DP intelligent module and PLC control system and method - Google Patents
DP intelligent module and PLC control system and method Download PDFInfo
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- CN105988411A CN105988411A CN201610274572.8A CN201610274572A CN105988411A CN 105988411 A CN105988411 A CN 105988411A CN 201610274572 A CN201610274572 A CN 201610274572A CN 105988411 A CN105988411 A CN 105988411A
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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
- G05B19/056—Programming the PLC
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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
- G05B2219/10—Plc systems
- G05B2219/13—Plc programming
- G05B2219/13004—Programming the plc
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- General Physics & Mathematics (AREA)
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- Automation & Control Theory (AREA)
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Abstract
The invention discloses a DP intelligent module, and is used for solving the technical problems that PLC algorithm program encryption protection is insufficient and one PLC control module can only apply one control algorithm. The DP intelligent module comprises a master controller, a DP slave station module and an RS485 interface module. The master controller is connected with the DP slave station module which is connected with the RS485 interface module. The RS485 interface module is connected with a Profibus-DP bus. The master controller is used for receiving, storing and operating a PLC control algorithm. The DP slave station module is used for realizing data interaction between the master controller and the RS485 interface module. The RS485 interface module is used for realizing data interaction between the DP slave station module and the Profibus-DP bus. The invention also discloses a PLC control system and method.
Description
Technical field
The present invention relates to PLC (Programmable Logic Controller, Programmable logical controller) skill
Art field, is specifically related to a kind of DP (Decentralized Periphery, decentralized ancillary equipment) intelligence
Module, PLC control system and method.
Background technology
Programmable logical controller PLC system is the replacement traditional relay dress that the U.S. releases at twentieth century
Putting, for realizing some user-defined Automated condtrol, logical operations, counting with the one of timing function is
Row use the logic controller of programmable logical storage.Due to PLC wide adaptability, stability in use
The advantages such as good, anti-tampering ability is strong, have been widely used in industrial every field, its development
Very fast.Big machinery and production line are nearly all to use PLC system based on industrial network real at present
Execute control and communicate, thus the control realizing equipment and production technology is integrated with management.
But, owing to PLC software has opening, there is the situation that algorithm routine protection is not enough,
In PLC system maintenance process, it is revised performance easily and causes fixing algorithm change in PLC program
Rear field adjustable workload is big, and the cycle is long, and labour cost expenditure is big；Simultaneously as the office of PLC programming
Sex-limited so that a PLC control module can only apply a kind of control algolithm, thus can only be for specifically
Actuator completes single control.
Summary of the invention
In view of this, the present invention provides a kind of DP intelligent object, PLC control system and method, to solve
Certainly present in prior art, PLC algorithm routine encipherment protection is not enough and a kind of PLC control module only
The problem that can apply a kind of control algolithm.
For solving the problems referred to above, the technical scheme that the present invention provides is as follows:
A kind of DP intelligent object, described DP intelligent object includes:
Master controller, DP slave station module and RS485 interface module；
Described master controller is connected with described DP slave station module, described DP slave station module and described RS485
Interface module is connected, and described RS485 interface module is connected with Profibus-DP bus；
Described master controller, is used for receiving, store and run PLC control algolithm；
Described DP slave station module, is used for realizing between described master controller and described RS485 interface module
Data interaction；
Described RS485 interface module, is used for realizing described DP slave station module and described Profibus-DP
Data interaction between bus.
Accordingly, described master controller carries (SuSE) Linux OS, uses ARM controller to realize.
Accordingly, described DP slave station module includes microcontroller and VPC3 protocol conversion chip；Institute
State microcontroller and use STMF103ZET6 chip microcontroller.
Accordingly, described microcontroller, slow for exporting from the data of described VPC3 protocol conversion chip
Rush district's reading Data Concurrent and give described master controller；The data that described master controller sends are stored in described
The data output buffer of VPC3 protocol conversion chip；
VPC3 protocol conversion chip, for obtaining data from described RS485 interface module, is stored in described
Data output buffer；The data that described microcontroller is stored in described data output buffer are sent to institute
State RS485 interface module.
Accordingly, described RS485 interface module uses ADM486 chip based on Magnetic isolation.
A kind of PLC control system, described PLC control system includes:
PLC master station, DP intelligent object and at least one PLC slave station；
Described PLC master station, described DP intelligent object and at least one described PLC slave station all with
Profibus-DP bus is connected；
Described DP intelligent object is the DP intelligent object described in any one of claim 1-5.
Accordingly, described PLC control system also includes:
Monitor client, described monitor client is connected with described DP intelligent object, for being controlled by PLC
Algorithm processed is sent to the master controller in described DP intelligent object.
A kind of PLC control method, described method is applied to DP intelligent object, described DP intelligent object
Including master controller, DP slave station module and RS485 interface module, described master controller and described DP
Slave station module is connected, and described DP slave station module is connected with described RS485 interface module, described RS485
Interface module is connected with Profibus-DP bus；Described method includes:
Described RS485 interface module obtains the data that PLC master station is exported by Profibus-DP bus；
Described DP slave station module obtains the number of described PLC master station output by described RS485 interface module
According to, and the data that described PLC master station exports are sent to described master controller；
Described main operation controller PLC control algolithm, the data genaration exported according to described PLC master station
Result data, and described result data is sent to described DP slave station module；
Described result data is sent to described RS485 interface module by described DP slave station module；
Described result data is sent to by described RS485 interface module by described Profibus-DP bus
Described PLC master station.
Accordingly, described DP slave station module includes microcontroller and VPC3 protocol conversion chip；
Described DP slave station module obtains the number of described PLC master station output by described RS485 interface module
According to, and the data that described PLC master station exports are sent to described master controller, including:
Described VPC3 protocol conversion chip obtains the output of described PLC master station from described RS485 interface module
Data, and be stored in data output buffer；
Described microcontroller reads described from the data output buffer of described VPC3 protocol conversion chip
The data of PLC master station output, and it is sent to described master controller.
Accordingly, described result data is sent to described RS485 interface module by described DP slave station module,
Including:
The result data that described master controller sends is stored in described VPC3 protocol conversion by described microcontroller
The data output buffer of chip；
Described result data is sent to described RS485 interface module by described VPC3 protocol conversion chip.
As can be seen here, the embodiment of the present invention has the advantages that
The embodiment of the present invention uses the ARM controller carrying (SuSE) Linux OS to replace traditional PLC
Controller, constitutes embedded DP intelligent object, can with the different PLC control algolithm of downloading-running, from
And a DP intelligent object can realize different control algolithms；Control algolithm downloads to ARM control
In device, general maintenance engineering technical staff has the most revisable encryption performance to PLC control program；With
Time, DP slave station module can realize the communication between main website in high quality.Therefore, the embodiment of the present invention
The DP intelligent object provided can be articulated in Profibus-DP bus easily as slave station, passes through
The various control algorithm that ARM controller realizes is possible not only to improve the function of PLC control system, it is ensured that
Algorithm stable and reliable, moreover it is possible to notable shorten the field adjustable time, improve system reliability of operation and
Maintainable.
Accompanying drawing explanation
The schematic diagram of the Fig. 1 DP intelligent object embodiment one for providing in the embodiment of the present invention；
The schematic diagram of the Fig. 2 DP intelligent object embodiment two for providing in the embodiment of the present invention；
Fig. 3 is the hardware realization figure of main control module in the embodiment of the present invention；
Fig. 4 is the hardware realization figure of DP slave station module in the embodiment of the present invention；
Fig. 5 is the hardware realization figure of RS485 interface module in the embodiment of the present invention；
The schematic diagram of the PLC control system embodiment that Fig. 6 provides in implementing for the present invention；
Fig. 7 is the flow chart downloading PLC control algolithm during the present invention implements to main controller module；
The flow chart of the PLC control method embodiment that Fig. 8 provides in implementing for the present invention；
Fig. 9 is the workflow diagram of DP slave station module during the present invention implements.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
With detailed description of the invention, the embodiment of the present invention is described in further detail.
Shown in Figure 1, it is the DP intelligent object embodiment one provided in the embodiment of the present invention, can wrap
Include:
Master controller 1, DP slave station module 2 and RS485 interface module 3.
Master controller 1 is connected with DP slave station module 2, DP slave station module 2 and RS485 interface module 3
Being connected, RS485 interface module 3 is connected with Profibus-DP bus.Master controller 1 can pass through SPI
(Serial Peripheral Interface, Serial Peripheral Interface (SPI)) interface is connected with DP slave station module 2,
Profibus-DP bus based on Profibus agreement, logical for device level control system and distributing I/O
Letter.This DP intelligent object can be connected with Profibus-DP bus as a PLC slave station,
PLC master station and other PLC slave stations can also be connected in Profibus-DP bus, thus DP is intelligent
Module, PLC master station and at least one PLC slave station can collectively form a kind of PLC control system.
In DP intelligent object, wherein, master controller 1, it is used for receiving, store and run PLC control
Algorithm processed.
In some implementations of the present invention, master controller 1 carries (SuSE) Linux OS, uses ARM
Controller realizes, and can download to the PLC control algolithm of various complexity carry (SuSE) Linux OS
ARM controller is run, owing to the PLC control algolithm downloaded in ARM controller cannot be random
Amendment, it is ensured that the Stability and dependability of PLC control algolithm, has reached to enter PLC control algolithm
The effect of row encipherment protection, protects the intellectual property of program designer, solves PLC simultaneously and controls to calculate
Because of change, method causes that field adjustable workload is big, the technical problem of cycle length.
DP slave station module, for realizing the data interaction between master controller and RS485 interface module.
RS485 interface module, for realizing the data between DP slave station module and Profibus-DP bus
Alternately.
DP slave station module and RS485 interface module realize DP intelligent object and Profibus-DP jointly
Communication between bus, thus DP intelligent object can receive PLC master by Profibus-DP bus
Stand send data, it is also possible to send the data to PLC master station by Profibus-DP bus.
Shown in Figure 2, it is the DP intelligent object embodiment two provided in the embodiment of the present invention.Can wrap
Include:
Master controller 1, DP slave station module 2 and RS485 interface module 3.
Shown in Figure 3, it is the hardware realization figure of main control module.Main control module uses ARM control
Device processed, its minimum system figure includes reset circuit, crystal oscillating circuit etc., is the core of DP intelligent object
Point, (SuSE) Linux OS can be carried, replace traditional PLC, it is achieved Various Complex PLC
Control algolithm and PLC control algolithm can be encrypted protection so that this DP intelligent object can be complete
Become specific PLC control algolithm, complete PLC control system can be constituted with PLC system again.
In some implementations of the present invention, DP slave station module 2 can include microcontroller 21 with
And VPC3 protocol conversion chip 22.Shown in Figure 4, it is the hardware realization figure of DP slave station module,
Microcontroller 21 can use STMF103ZET6 chip microcontroller, and microcontroller 21 can be to VPC3
Protocol conversion chip 22 configures, such as include the initialization to VPC3 protocol conversion chip and in
Disconnected process etc..VPC3 protocol conversion chip can realize DP intelligent object as PLC slave station and PLC
Data communication between main website.VPC3 protocol conversion chip is the specialized protocol chip of SIEMENS PLC,
It supports PROFIBUS-DP agreement, and has been internally integrated the dual port RAM of 1.5k byte, internal lock
Storage/register-bit in front 21 address locations, can improve communicating of DP intelligent object and main website PLC
Speed.
The interrupt register of VPC3 protocol conversion chip 22 can be read by microcontroller 21 to judge
Trigger the reason interrupted and carry out corresponding interrupt processing, to realize the communication between main website.
The operation principle of DP slave station module can be: when VPC3 protocol conversion chip is connect by RS485
After mouth die block receives the data that main website sends, produce DataOut and interrupt, VPC3 protocol conversion chip
Monitor in DataOut and have no progeny, obtain data from RS485 interface module, place data into data input
Restore data output buffer in relief area；Microcontroller is defeated from the data of VPC3 protocol conversion chip
Go out relief area reading Data Concurrent and give master controller；After master controller produces result data, microcontroller
The data that master controller sends are stored in the data output buffer of VPC3 protocol conversion chip, VPC3 by device
Protocol conversion chip produces DataIn to interrupt, and it is defeated that microcontroller is stored in data by VPC3 protocol conversion chip
The data going out relief area are sent to RS485 interface module.It addition, VPC3 protocol conversion chip is in number
During according to swap status, in addition to same main website carries out inputoutput data exchange, it is also possible to receive it from main website
He controls parameter.
Shown in Figure 5, it is the hardware realization figure of RS485 interface module, in some realizations of the present invention
In mode, RS485 interface module can use ADM486 chip based on Magnetic isolation, and it uses at a high speed
CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductors (CMOS))
Technique and the transformer technology of chip-scale, the everyways such as performance, power consumption, volume have traditional optocoupler every
From the advantage that period is incomparable, based on this ADM486 chip realize DP slave station module with
Data interaction between Profibus-DP bus, it is ensured that the transmission that data efficient is stable.
So, the embodiment of the present invention uses the ARM controller carrying (SuSE) Linux OS to replace tradition
PLC, constitute embedded DP intelligent object, can control to calculate with the different PLC of downloading-running
Method, thus a DP intelligent object can realize different control algolithms；Control algolithm downloads to ARM
In controller, general maintenance engineering technical staff has the most revisable encryption to PLC control program
Energy；Meanwhile, DP slave station module can realize the communication between main website in high quality.Therefore, the present invention
The DP intelligent object that embodiment provides can be articulated in Profibus-DP bus easily as slave station,
The various control algorithm realized by ARM controller is possible not only to improve the function of PLC control system,
Ensure the stable and reliable of algorithm, moreover it is possible to significantly shorten the field adjustable time, improve the reliable of system operation
Property and maintainability.
Shown in Figure 6, it is the PLC control system embodiment provided in the embodiment of the present invention, can wrap
Include:
PLC master station 601, DP intelligent object 602 and at least one PLC slave station 603；PLC master
Stand, DP intelligent object and at least one PLC slave station are all connected with Profibus-DP bus.Wherein,
DP intelligent object can be the DP intelligent object in above-described embodiment.
In some implementations of the present invention, PLC control system can also include:
Monitor client, monitor client is connected with DP intelligent object, for PLC control algolithm being sent out
Deliver to the master controller in DP intelligent object.
Related description about DP intelligent object may refer to above-described embodiment, does not repeats them here.
Shown in Figure 7, it is the flow process downloading PLC control algolithm during the present invention implements to main controller module
Figure, may include that
Step 701: main controller module creation socket, keeps listening state.
Step 702: determine whether the connection from monitor client by monitoring, if it is, enter
Step 703, if it does not, return step 702.
The program being currently running of step 703:Kill last downloaded.When there being the company from monitor client
Connect, then explanation has new PLC control program to need to download in master controller, under first Kill last time
The PLC control algolithm being currently running carried.
Step 704: definition file stream, opens file, completes transmission.
Step 705: perform the program file downloaded.
In the present embodiment, the PLC programming software of monitor client can configure DP intelligent object
Address and input/output interface variable, main PLC control algolithm program can be downloaded to by interface
In the middle of master controller i.e. ARM controller, generally downloading to the file in master controller is .o lattice
The executable file of formula, the programmed environment carried by ARM controller, can store and run these
PLC control algolithm, thus the some parts within PLC controls function algorithm and can be loaded into DP intelligence
In module, coordinated by ARM controller and realize complicated Industry Control.Operator can call DP
Intelligent object and cannot see that the program in DP intelligent object, prevent operator from arbitrarily it being repaiied
Change.
So, the embodiment of the present invention uses the ARM controller carrying (SuSE) Linux OS to replace tradition
PLC, constitute embedded DP intelligent object, can control to calculate with the different PLC of downloading-running
Method, thus a DP intelligent object can realize different control algolithms；Control algolithm downloads to ARM
In controller, general maintenance engineering technical staff has the most revisable encryption to PLC control program
Energy；Meanwhile, DP slave station module can realize the communication between main website in high quality.Therefore, the present invention
The DP intelligent object that embodiment provides can be articulated in Profibus-DP bus easily as slave station,
The various control algorithm realized by ARM controller is possible not only to improve the function of PLC control system,
Ensure the stable and reliable of algorithm, moreover it is possible to significantly shorten the field adjustable time, improve the reliable of system operation
Property and maintainability.
Shown in Figure 8, it is the PLC control method embodiment provided in the embodiment of the present invention, the method
Can apply to the DP intelligent object provided in the above embodiment of the present invention, DP intelligent object can include
Master controller, DP slave station module and RS485 interface module, master controller and DP slave station module phase
Even, DP slave station module is connected with RS485 interface module, and RS485 interface module is total with Profibus-DP
Line is connected；The method may include that
Step 801:RS485 interface module obtains what PLC master station was exported by Profibus-DP bus
Data；
Step 802:DP slave station module obtains the data of PLC master station output by RS485 interface module,
And the data that PLC master station exports are sent to master controller；
Step 803: main operation controller PLC control algolithm, according to the data genaration of PLC master station output
Result data, and result data is sent to DP slave station module；
Result data is sent to RS485 interface module by step 804:DP slave station module；
Result data is sent to PLC by Profibus-DP bus by step 805:RS485 interface module
Main website.
In some implementations of the present invention, DP slave station module can include microcontroller and VPC3
Protocol conversion chip；
Then DP slave station module obtains the data of PLC master station output by RS485 interface module, and will
The data of PLC master station output are sent to master controller, may include that
VPC3 protocol conversion chip obtains the data of PLC master station output from RS485 interface module, and deposits
Enter data output buffer；Microcontroller reads from the data output buffer of VPC3 protocol conversion chip
The data of PLC master station output, and it is sent to master controller.
Result data is sent to RS485 interface module by DP slave station module, may include that
The data that the result data that master controller sends is stored in VPC3 protocol conversion chip by microcontroller are defeated
Go out relief area；Result data is sent to RS485 interface module by VPC3 protocol conversion chip.
Shown in Figure 9, it is the workflow diagram of DP slave station module, then to DP slave station module from master
The process of reception data of standing illustrates, and may include that
Step 901: microcontroller STMF103ZET6 single-chip microcomputer internal register initializes.
Step 902: VPC3 protocol conversion chip is initialized by microcontroller STMF103ZET6.
The initialization of VPC3 protocol conversion chip may include that arrange protocol conversion chip interruption allow,
Write slave station identifier and address, arrange VPC3 mode register, arrange diagnosis relief area, parameter delay
Rush district, configuration relief area, address buffer, each buffer length of initialization, and according to above initial value
Draw the pointer of each relief area and the pointer of supplementary buffer.
Step 903: start VPC3 protocol conversion chip.Can be by microcontroller to VPC3 agreement
Conversion chip sends the mode of start up command signals and starts VPC3 protocol conversion chip.
Step 904: microcontroller STMF103ZET6 judges whether main website exports data, if it is,
Enter step 905, if it does not, return step 904.
After VPC3 protocol conversion chip receives, by RS485 interface module, the data that main website sends,
Place data into data input buffer district to restore data output buffer；
Microcontroller can be by reading the data pointer of VPC3 protocol conversion chip data output buffer
Judge whether main website exports data, namely VPC3 protocol conversion chip places data into data output and delays
After rushing district, the data pointer of data output buffer is not empty, then there are output data in main website.
Step 905: read main website data.Microcontroller can be from the data of VPC3 protocol conversion chip
Output buffer reads main website data.
Step 906: prepare SPI interface input data.
Step 907: by being conveyed into data on SPI interface.
SPI interface is used to be connected between microcontroller and master controller in DP slave station module, microcontroller
The main website data of reading can be sent to master controller by SPI interface.
During it addition, VPC3 protocol conversion chip is in data swap status, except same main website inputs
Outside output data exchange, it is also possible to receive new parameter exchange, can post by reading the interruption of VPC3
Storage judges trigger the reason interrupted and carry out corresponding interrupt processing.
So, the embodiment of the present invention uses the ARM controller carrying (SuSE) Linux OS to replace tradition
PLC, constitute embedded DP intelligent object, can control to calculate with the different PLC of downloading-running
Method, thus a DP intelligent object can realize different control algolithms；Control algolithm downloads to ARM
In controller, general maintenance engineering technical staff has the most revisable encryption to PLC control program
Energy；Meanwhile, DP slave station module can realize the communication between main website in high quality.Therefore, the present invention
The DP intelligent object that embodiment provides can be articulated in Profibus-DP bus easily as slave station,
The various control algorithm realized by ARM controller is possible not only to improve the function of PLC control system,
Ensure the stable and reliable of algorithm, moreover it is possible to significantly shorten the field adjustable time, improve the reliable of system operation
Property and maintainability.
It should be noted that each embodiment uses the mode gone forward one by one to describe in this specification, each enforcement
What example stressed is all the difference with other embodiments, identical similar portion between each embodiment
See mutually.For system disclosed in embodiment or device, disclosed in itself and embodiment
Method is corresponding, so describe is fairly simple, relevant part sees method part and illustrates.
Also, it should be noted in this article, the relational terms of such as first and second or the like is only used
One entity or operation are separated with another entity or operating space, and not necessarily requires or secretly
Show relation or the order that there is any this reality between these entities or operation.And, term " bag
Include ", " comprising " or its any other variant be intended to comprising of nonexcludability, so that include one
The process of list of elements, method, article or equipment not only include those key elements, but also include not having
Other key elements being expressly recited, or also include being consolidated by this process, method, article or equipment
Some key elements.In the case of there is no more restriction, statement " including ... " key element limited,
It is not precluded from there is also in including the process of described key element, method, article or equipment other identical
Key element.
The method described in conjunction with the embodiments described herein or the step of algorithm can directly use hardware,
The software module that processor performs, or the combination of the two implements.Software module can be placed in and deposit at random
Reservoir (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electric erasable can be compiled
Well known in journey ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a DP intelligent object, it is characterised in that described DP intelligent object includes:
Master controller, DP slave station module and RS485 interface module；
Described master controller is connected with described DP slave station module, described DP slave station module and described RS485
Interface module is connected, and described RS485 interface module is connected with Profibus-DP bus；
Described master controller, is used for receiving, store and run PLC control algolithm；
Described DP slave station module, is used for realizing between described master controller and described RS485 interface module
Data interaction；
Described RS485 interface module, is used for realizing described DP slave station module and described Profibus-DP
Data interaction between bus.
DP intelligent object the most according to claim 1, it is characterised in that described master controller is taken
Carry (SuSE) Linux OS, use ARM controller to realize.
DP intelligent object the most according to claim 1, it is characterised in that described DP slave station mould
Block includes microcontroller and VPC3 protocol conversion chip；Described microcontroller uses STMF103ZET6
Chip microcontroller.
DP intelligent object the most according to claim 3, it is characterised in that
Described microcontroller, for reading from the data output buffer of described VPC3 protocol conversion chip
Data Concurrent gives described master controller；The data that described master controller sends are stored in described VPC3 association
The data output buffer of view conversion chip；
VPC3 protocol conversion chip, for obtaining data from described RS485 interface module, is stored in described
Data output buffer；The data that described microcontroller is stored in described data output buffer are sent to institute
State RS485 interface module.
DP intelligent object the most according to claim 1, it is characterised in that described RS485 interface
Module uses ADM486 chip based on Magnetic isolation.
6. a PLC control system, it is characterised in that described PLC control system includes:
PLC master station, DP intelligent object and at least one PLC slave station；
Described PLC master station, described DP intelligent object and at least one described PLC slave station all with
Profibus-DP bus is connected；
Described DP intelligent object is the DP intelligent object described in any one of claim 1-5.
PLC control system the most according to claim 6, it is characterised in that described PLC controls
System also includes:
Monitor client, described monitor client is connected with described DP intelligent object, for being controlled by PLC
Algorithm processed is sent to the master controller in described DP intelligent object.
8. a PLC control method, it is characterised in that described method is applied to DP intelligent object,
Described DP intelligent object includes master controller, DP slave station module and RS485 interface module, described
Master controller is connected with described DP slave station module, described DP slave station module and described RS485 interface mould
Block is connected, and described RS485 interface module is connected with Profibus-DP bus；Described method includes:
Described RS485 interface module obtains the data that PLC master station is exported by Profibus-DP bus；
Described DP slave station module obtains the number of described PLC master station output by described RS485 interface module
According to, and the data that described PLC master station exports are sent to described master controller；
Described main operation controller PLC control algolithm, the data genaration exported according to described PLC master station
Result data, and described result data is sent to described DP slave station module；
Described result data is sent to described RS485 interface module by described DP slave station module；
Described result data is sent to by described RS485 interface module by described Profibus-DP bus
Described PLC master station.
Method the most according to claim 8, it is characterised in that described DP slave station module includes micro-
Controller and VPC3 protocol conversion chip；
Described DP slave station module obtains the number of described PLC master station output by described RS485 interface module
According to, and the data that described PLC master station exports are sent to described master controller, including:
Described VPC3 protocol conversion chip obtains the output of described PLC master station from described RS485 interface module
Data, and be stored in data output buffer；
Described microcontroller reads described from the data output buffer of described VPC3 protocol conversion chip
The data of PLC master station output, and it is sent to described master controller.
Method the most according to claim 9, it is characterised in that described DP slave station module is by institute
State result data and be sent to described RS485 interface module, including:
The result data that described master controller sends is stored in described VPC3 protocol conversion by described microcontroller
The data output buffer of chip；
Described result data is sent to described RS485 interface module by described VPC3 protocol conversion chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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