CN105094021A - PLC cooperative control device based on ARM embedded technology - Google Patents
PLC cooperative control device based on ARM embedded technology Download PDFInfo
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- CN105094021A CN105094021A CN201510577971.7A CN201510577971A CN105094021A CN 105094021 A CN105094021 A CN 105094021A CN 201510577971 A CN201510577971 A CN 201510577971A CN 105094021 A CN105094021 A CN 105094021A
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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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- 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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- 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
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25314—Modular structure, modules
Abstract
The invention relates to a PLC cooperative control device based on the ARM embedded technology. The PLC cooperative control device based on the ARM embedded technology comprises a hardware system and a software system, wherein the hardware system comprises a CPU module, a power source module, a digital input module, a digital output module, an analog quantity I/O module and a bottom board connection module, the CPU module, the power source module, the digital input module, the digital output module and the analog quantity I/O module are respectively connected with the bottom board connection module, the digital input module and the digital output module realize device connection with an external I/O interface, on-site analog quantity is converted by an analog quantity I/O circuit into a voltage signal which is applicable after A/D conversion, then conversion is further carried out, a voltage input signal passes through a filtering circuit and a voltage clamp circuit and then is inputted to an A/D interface after level gain conversion, if current input, I/V conversion is carried out firstly, and then other processing is carried out. The PLC cooperative control device has advantages of quite strong modifiability and transportability and relatively high system reliability.
Description
Technical field
The present invention relates to the soft core PLC device of a kind of industry control ARM chip, particularly relate to the device that a kind of collaborative PLC based on embedded technology realizes industrial automatic control.
Background technology
Because conventional hardware PLC technology is to outer closure, the PLC hardware platform of each production firm is different, and the PLC language of support is not identical yet, and the agreement communicated each other is also completely different with bus.Therefore, along with the development of computer technology, people have recognized the versatility of hardware PLC, compatibility and the bad fast development that govern PLC of expansion gradually.Meanwhile, along with the technological transformation of a cigarette industry new round, a large amount of novel tobacco throwing equipment is introduced from the foreign cigarette machine equipment company of state such as German HAUNI, Italian Garbuio, and equipment manufacturer takes blockade on new techniques for the PLC program of key equipment and the means such as even to encrypt.Therefore, cigarette machine function is improved, need to seek a kind of new solution to break through the problems such as the blockade of conventional P LC internal processes and outside versatility, poor compatibility.
Be that 32 high-performance microprocessors of representative have impelled the high speed development of embedded system with ARM, make system development more convenient and flexible.Meanwhile, I
2the development of C bus makes bus speed reach 3.4Mbps, extends communication distance, has outstanding warm connection function, and has a whole set of perfect product, comprises the devices such as a large amount of hubs, repeater, multiplexer and switch, by I
2c technology develops into powerful and comprehensive net control from the simple application of chip chamber two wires communication.Endorse cutting in built-in Linux has, function be customizable, efficiency is high, good stability, reliability are high, transplantability good, the advantage such as open source, contain complete TCP/IP network protocol stack also, be well suited for applying in built-in field.
Summary of the invention
The object of the present invention is to provide a kind of PLC Collaborative Control device based on ARM embedded technology.PLC Collaborative Control device based on ARM embedded technology is not changing under original PLC program, hardware connection prerequisite exactly, by fieldbus access PLC internal resource, and again pass self steering logic operation result back PLC by fieldbus, finally realize double-core Collaborative Control.Conventional hardware PLC is assisted to complete Automated condtrol as virtual PLC the ARM based on embedded technology, the shortcoming of the single control of solution conventional P LC, customizes various function by Linux platform and conventional P LC real-time communication reaches the object controlling same equipment when double-core is worked in coordination with.
In order to realize above-mentioned object, present invention employs following technical scheme:
Based on a PLC Collaborative Control device for ARM embedded technology, comprise hardware system and software systems two parts; Described hardware system comprises CPU module, power module, digital input module, digital output module, analog quantity I/O module and base plate link block, and CPU module, power module, digital input module, digital output module are connected with base plate link block respectively with analog quantity I/O module; Described CPU module selects AT91RM9200 microprocessor as control chip, and AT91RM9200 microprocessor is connected with reset circuit, SDRAM chip, Flash chip, RS232 communication interface A, RS232 communication interface B, Ethernet interface and I
2c bus interface, and reset circuit is set for ensureing the stable of system cloud gray model; The SDRAM chip of expansion 16MB capacity, the Flash chip of 8MB capacity; RS232 communication interface A as the supervision interface of whole device, simultaneously as debugging interface; RS232 communication interface B is the core bus of whole collaborative controller; Ethernet interface realizes the communication with host computer; I
2c bus interface carries out communication with the external device based on agreement; The contact of described digital input module and digital output module implement device and exterior I/O interface; Described analog quantity I/O circuit selects PCF8591 chip, change after the voltage signal that analog quantity I/O circuit is suitable for after first the analog quantity at scene being transformed into A/D conversion, voltage input signal is by filtering circuit and voltage clamp circuit, carry out electric-level gain conversion again and be input to A/D interface, if electric current input, first carry out I/V conversion and process again;
Described software systems comprise built-in Linux real time operating system, Bootloader boot, system service program, user application; Described built-in Linux real time operating system selects Linux-2.4.19 kernel version as embedded OS, and described Bootloader is using U-Boot as Boot loader, and initiating hardware equipment also sets up the mapping graph of memory headroom; Described (SuSE) Linux OS comprises linux kernel and root file system two parts, linux kernel is according to the actual hardware situation of this device, linux system and various device drives are transplanted, root file system is for depositing various instrument, application program, required chained library; Described system service program provides the application program of service to user, and the application program for user provides necessary service; User application refers to the program code realizing virtual PLC function in this device, by the executable file that the compiling of the trapezoid figure program of PLC generates.
As preferably, described DIO uses photoelectrical coupler, realizes signal input by pull-up resistor and photoelectrical coupler, realizes signal export by pull down resistor and photoelectrical coupler.
As preferably, the analog quantity output signals of described PCF8591 chip keeps through inner retainer, circuit, gain conversion circuit and power amplification circuit deliver to topworks to the output signal of retainer after filtering, export the voltage of 0 ~ 10V, control topworks's control law action on request.
The present invention, owing to selecting ARM to be core and utilizing embedded technology to build, has very strong alterability and portability; The real-time of system cloud gray model is ensure that owing to the addition of Linux real time operating system, and custom feature function can be write according to specifically needing, specific function required for freely adding, increases simultaneously or reduces the quantity of I/O port easily, system is had more and can expand and maintainability; Again because ARM has higher density, can integrated very large system, because this in turn increases the reliability of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is that the present invention works in coordination with PLC control schematic diagram.
Fig. 3 is hardware of the present invention composition schematic diagram.
Fig. 4 is ARM system of the present invention composition schematic diagram.
Fig. 5 is DIO schematic diagram of the present invention.
Fig. 6 is Simulation with I of the present invention/O circuit diagram.
Fig. 7 is software systems operational scheme schematic diagram of the present invention.
Fig. 8 is software systems of the present invention composition schematic diagram.
Fig. 9 is software systems method of operation schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is made a detailed explanation.
As shown in Figure 1, present system comprises hardware system 1 and software systems 2 two parts; Described hardware system 1 comprises CPU module 3, power module 4, digital input module 5, digital output module 6 and analog quantity I/O module 7; Described software systems 2 comprise built-in Linux real time operating system 8, Bootloader boot 9, system service program 10, user application 11.
As shown in Figure 2, the described PLC Collaborative Control device based on ARM embedded technology is not changing under original PLC program, hardware connection prerequisite exactly, by fieldbus access PLC internal resource, and again pass self steering logic operation result back PLC by fieldbus, finally realize double-core Collaborative Control.
As shown in Figure 3, modules is coupled together by base plate 12 link block by described device.Power module 4 provides various grade operating voltage for each module; CPU module 3 is cores of whole PLC collaborative controller system, with other I/O module composition virtual PLC systems, by transplanting embedded system in CPU module, carry out executive utility, and the signal of Gather and input module, control the output of other I/O modules through process, reach the object of practical function customization.
As shown in Figure 4, described CPU selects AT91RM9200 microprocessor 13 as control chip, and reset circuit 14 is for ensureing the stable of system cloud gray model; The SDRAM chip 15 of expansion 16MB capacity is used for performing inner embedded OS, to improve the travelling speed of whole system; The Flash chip 16 of expansion 8MB capacity is as the storage of embedded OS and application program; RS232 communicates the supervision interface of 1 interface 17 as whole device, and the interface software provided by host computer carrys out the log-on message of supervisory system, simultaneously as debugging interface, and the function such as to arrange that can realize apparatus system variable by order; RS232 2 interfaces 18 that communicate are core bus of whole collaborative controller, communication is carried out by RS485 on the one hand with the original PLC of equipment, transmission internal state and control command, on the other hand by control information by bus be delivered to self I/O module from device, the state of load module is delivered to CPU module 3 by bus, after routine processes, then control the state change of each output module; Ethernet interface 19 realizes the communication with host computer, quick-downloading embedded system and application program, and surveillance running status changes, and realizes the information interaction between host computer and virtual PLC system; I
2c bus interface 20 carries out communication with the external device based on this agreement.
As shown in Figure 5, described digital input module 6 and digital output module 7 want the contact of implement device and exterior I/O interface.In order to restraint speckle signal and prevent sensitive circuit elements because external voltage sudden change and cause damage, DIO 6 need use photoelectrical coupler.Realize signal input by pull-up resistor 21 and photoelectrical coupler 22, realize signal by pull down resistor 23 and photoelectrical coupler 24 and export.
As shown in Figure 6, described analog quantity I/O module 8 selects PCF8591 chip 25.The functions such as the main settling signal filtering of circuit preprocessing part, level conversion, change after the voltage signal be suitable for after first the analog quantity at scene being transformed into A/D conversion.Voltage input signal by filtering 26 and voltage clamp 27 circuit, then carries out electric-level gain 28 conversion and is input to A/D interface; If the input of 4 ~ 20mA electric current, first carry out I/V conversion 29 and process again.The analog quantity output signals of PCF8591 keeps through inner retainer, so that before new output signal arrives, existing output signal can be maintained constant, thus topworks's drive singal is maintained, the output signal of retainer after filtering 30, gain transform 31 and power amplification 32 circuit deliver to topworks, export the voltage of 0 ~ 10V, control topworks's control law action on request.
As shown in Figure 7, described collaborative controller selects Linux-2.4.19 kernel version as embedded OS.Device, after powering on or resetting, first starts hardware check, when confirming intact, realizes serial ports, I
2the driving of C bus, system break and other hardware, successfully starts (SuSE) Linux OS, then performs the system plug-in be solidificated in CPU module.Complete the judgement of three kinds of states (download, run, stop) of PLC Collaborative Control device, realize different functions according to different situations.
As shown in Figure 8, described device selects U-Boot as Bootloader Boot loader 33, initiating hardware equipment also sets up the mapping graph of memory headroom, thus make the hardware environment of system reach a suitable state, to get out correct environment for final call operation system kernel.Then decompress(ion) kernel reflection, then jump to kernel reflection entrance.
Described (SuSE) Linux OS 34 comprises linux kernel and root file system two parts: linux system and various device drives, according to the actual hardware situation of this device, are transplanted by linux kernel.Linux kernel carries out recompile kernel for the target cpu plate of virtual PLC system, realizes the various device drives of CPU module, comprises network interface, RS232 serial ports, I2C bus driver, device three kinds of running status drives interrupts etc.; Root file system is used for depositing various instrument (Linux order etc.), application program, required chained library etc., device adopts RAMDISK as root file system, internal memory RAM and disk DISK connects by it, opens up a block space and use as disk in internal memory.Perform the init program of user, completion system initialization, work such as startup related service and leading subscriber login etc.
Described system service program 35 mainly comprises several part below: utilize lrz/lsz kit to compile rz, sz instrument of generation, realizes uploading and downloading of application program on serial ports; Utilize bftpd instrument to compile and generate ftp server client-side program, realize host computer game server and carry out uploading and downloading of application program; Writing unit state determining program, coming the download of implement device, operation and stopping by reading three kinds of different states.
Described user application 36 refers to the executable file compiling of the trapezoid figure program of PLC generated, because RAMDISK is carried in internal memory SDRAM to run, after power down, data are not preserved, therefore in order to preserve the data of the device executable file after download and some needs preservations, make Jffs2 file system, direct efficiently flash chip can be operated, take into full account the situation of accident power-off simultaneously, after linux system starts, Jffs2 file system automatic hanging is downloaded to certain file of RAMDISK, user can carry out establishment and the preservation of application program very easily.
As shown in Figure 9, described plant running mode is similar with traditional PLC scan round mode, after linux system starts, first judge self peripheral hardware on off state and PLC peripheral state, if download state, then can download and ftp tool server by initialization serial ports, now user can carry out the download of application program by serial ports 1 or ftp log in means from host computer; If not download state, then proceed to operation or halted state, system first reset all timers, output relay reset, check whether bus and I/O connect intact, then running status is determined whether, circulate and perform the application program of user, comprise and keeping the sampling of input, sequential execution of programmed, finally carries out the refreshing of output state; Otherwise be the halted state of device, now then can keep current I/O state and corresponding system information, shutdown runs application.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.Usable range of the present invention is not only confined to tobacco industry and controls, and can expand other functions and be applied to more complicated industrial control field.In non-precise hard_drawn tuhes field, also can use independent for the present invention as PLC.
Claims (3)
1., based on a PLC Collaborative Control device for ARM embedded technology, comprise hardware system (1) and software systems (2) two parts; It is characterized in that: described hardware system (1) comprises CPU module (3), power module (4), digital input module (5), digital output module (6), analog quantity I/O module (7) and base plate link block (12), CPU module (3), power module (4), digital input module (5), digital output module (6) are connected with base plate link block (12) respectively with analog quantity I/O module (7); Described CPU module (3) selects AT91RM9200 microprocessor (13) as control chip, and AT91RM9200 microprocessor (13) is connected with reset circuit (14), SDRAM chip (15), Flash chip (16), RS232 communication interface A(17), RS232 communication interface B(18), Ethernet interface (19) and I
2c bus interface (20), and reset circuit (14) is set for ensureing the stable of system cloud gray model; The SDRAM chip (15) of expansion 16MB capacity, the Flash chip (16) of 8MB capacity; RS232 communication interface A(17) as the supervision interface of whole device, simultaneously as debugging interface; RS232 communication interface B(18) be the core bus of whole collaborative controller; Ethernet interface (19) realizes the communication with host computer; I
2c bus interface (20) carries out communication with the external device based on agreement; Described digital input module (5) and the contact of digital output module (6) implement device and exterior I/O interface; Described analog quantity I/O circuit (8) selects PCF8591 chip (25), change after the voltage signal that analog quantity I/O circuit (8) is suitable for after first the analog quantity at scene being transformed into A/D conversion, voltage input signal is by filtering circuit (26) and voltage clamp circuit (27), carry out electric-level gain conversion (28) again and be input to A/D interface, if electric current input, first carry out I/V conversion (29) and process again;
Described software systems (2) comprise built-in Linux real time operating system (8), Bootloader boot (9), system service program (10), user application (11); Described built-in Linux real time operating system (8) selects Linux-2.4.19 kernel version as embedded OS, described Bootloader(33) using U-Boot as Boot loader, initiating hardware equipment also sets up the mapping graph of memory headroom; Described (SuSE) Linux OS (34) comprises linux kernel and root file system two parts, linux kernel is according to the actual hardware situation of this device, linux system and various device drives are transplanted, root file system is for depositing various instrument, application program, required chained library; Described system service program (35) provides the application program of service to user, the application program for user provides necessary service; User application (11) refers to the program code realizing virtual PLC function in this device, by the executable file that the compiling of the trapezoid figure program of PLC generates.
2. a kind of PLC Collaborative Control device based on ARM embedded technology according to claim 1, it is characterized in that: DIO (6) uses photoelectrical coupler, realize signal input by pull-up resistor (21) and photoelectrical coupler (22), realize signal by pull down resistor (23) and photoelectrical coupler (24) and export.
3. a kind of PLC Collaborative Control device based on ARM embedded technology according to claim 1, it is characterized in that: the analog quantity output signals of PCF8591 chip (25) keeps through inner retainer, circuit (30), gain conversion circuit (31) and power amplification circuit (32) deliver to topworks to the output signal of retainer after filtering, export the voltage of 0 ~ 10V, control topworks's control law action on request.
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| CN201510577971.7A CN105094021A (en) | 2015-09-11 | 2015-09-11 | PLC cooperative control device based on ARM embedded technology |
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| CN201510577971.7A CN105094021A (en) | 2015-09-11 | 2015-09-11 | PLC cooperative control device based on ARM embedded technology |
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| CN107861716A (en) * | 2017-11-09 | 2018-03-30 | 山东省计算中心（国家超级计算济南中心） | Software definition type control system and control method |
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