CN2901383Y

CN2901383Y - Programmable controller for CAN bus

Info

Publication number: CN2901383Y
Application number: CN 200520047891
Authority: CN
Inventors: 王智; 马性辉; 王峰
Original assignee: PAIEN SCIENCE AND TECHNOLOGY Co Ltd SHANGHAI
Current assignee: PAIEN SCIENCE AND TECHNOLOGY Co Ltd SHANGHAI
Priority date: 2005-12-23
Filing date: 2005-12-23
Publication date: 2007-05-16
Anticipated expiration: 2015-12-23

Abstract

The utility model relates to a CAN-bus programmable controller, comprising a master-control section, an input section, an output section and a communication section, wherein the master-control section consists of microcontroller MCU and memory module, the input section comprises an analog variable input module, a counter module, a switch variable input module and a pulse-width modulation signal acquisition module, the output section consists of a switch variable output module and a PWM output module, the communication section consists of USB programmable interface module and CAN-communication interface module. Relative to the current technology, the utility model has the advantages of that it has rich programming languages, reliable communication, flexible speed, various interfaces, strong adaptability and nice performance.

Description

The CAN bus programmable controller

Technical field

The utility model relates to industrial Programmable Logic Controller PLC, relates in particular to a kind ofly to support with the CANOPEN protocol networking, defer to the controller of IEC61131-3 standard.

Background technology

The English of programmable controller is Programmable Controller, abbreviates PC as in the twentieth century 70-80 age always.To the nineties, because personal computer also abbreviates PC as, the scope that programmable notion contained is too big in addition, is programmable logic controller (PLC-Programmable Logic Controller) so American AB company names programmable controller first.For convenience, being called for short PLC again is programmable controller.The system that programmable controller is made of the people calls the PCS programmable control system, and what emphasize that programmable controller production firm provides to people has been complete system.

International Electrotechnical Commission (IEC) has passed through the definition to PLC in February, 1987:

Programmable Logic Controller is the electronic system of a kind of digital operation operation, aims in industrial environment to use and design.It adopts a class programmable memory, is used for its internally stored program, the actuating logic computing, and sequential control, regularly, counting and user oriented instruction such as arithmetical operation, and control various types of machineries or production run by numeral or analog I/O.Programmable Logic Controller and relevant external unit thereof all by being easy to be unified into an integral body with industrial control system, are easy to expand the principle design of its function.

Programmable Logic Controller be one it be to aim at that industrial environment is used and the microcomputer that manufactures and designs.It has abundant input/output interface, and has stronger driving force.But the Programmable Logic Controller product is not at a certain concrete commercial Application, and when practical application, its hardware need be selected configuration according to actual needs for use, and its software needs to require to carry out design compilation according to control.

Divide from structure, PLC is divided into fixed and two kinds of combined types (modular).Fixed PLC comprises CPU board, I/O plate, display panel, memory block, power supply etc., and these element set are synthesized a non-removable integral body.Modular PLC comprises CPU module, I/O module, internal memory, power module, base plate or frame, and these modules can be according to certain principle combinations configuration.

The Programmable Logic Controller of traditional existing techniques in realizing often uses RS232, RS422, RS485 as the physical layer communication agreement, and programming language generally uses ladder diagram.By analyzing existing implementation, can find that it has following technological deficiency:

1) adopt existing communication modes speed low, the networking difficulty does not have unified upper-layer protocol yet.

2) programming language is single, can not satisfy the diversified demand of programming personnel.

Summary of the invention

The purpose of this utility model is exactly the CAN bus programmable controller that provides for the defective that overcomes above-mentioned prior art existence.

The purpose of this utility model is achieved in that the CAN bus programmable controller, it is characterized in that, comprise main control part, importation, output and communications portion, main control part is made up of microcontroller MCU, memory module, the importation is made up of analog quantity load module, counter module, switching input module and pulse-width signal sampling module, output is made up of switching value output module and PWM output module, and communications portion is made up of USB DLL (dynamic link library) module and CAN communication interface modules.

Described memory module comprises command memory, two parts of data-carrier store.

Described microcontroller MCU and memory module, USB DLL (dynamic link library) module, CAN communication interface modules sum counter two-way connection of module, receive and send data and instruction, with analog quantity load module, switching input module with the pulse-width signal sampling module is unidirectional is connected, acquired signal, be connected output data with the switching value output module with the PWM output module is unidirectional.

Described microcontroller MCU accepts the instruction of command memory, and sampling is from the signal of each load module with from the data and the instruction of each communication module, according to the control algolithm computing, and to the output module output data, by the communication module echo reply.

Described analog quantity load module can be imported the voltage signal of 0-5V, the perhaps current signal of 0-25mA, described switching input module is gathered the high-low level of input signal, described counter module adopts hardware counter, realization is to counting, incremental encoder step-by-step counting and the frequency measurement of common input pulse, described pulse-width signal sampling module is the analog current input channel, gathers width modulation and adds current signal.

Described USB DLL (dynamic link library) module and CAN communication interface modules are that program is downloaded and the interface of debugging, the CAN communication interface modules under built-in CANOPEN agreement is supported and other support the external device communication of CANOPEN agreement.

Described switching value output module output low level is 0V, high level is the level signal of supply voltage, can be used for driving relay, and described pwm signal output module output duty cycle is the pulsed power signal of 0-100%, can be used for drive motor, electromagnetic proportional valve.

Described Programmable Logic Controller is supported the IEC61131-3 standard, supports instruction list (IL), ladder diagram (LD), order functional diagram (SFC), FBD (function block diagram) (FBD), structured text (ST), six kinds of language of continuous function figure (CFC) to programme.

Described Programmable Logic Controller is powered by system power supply.

The utility model has overcome the defective of prior art owing to adopted above technical scheme.Compared with prior art, the utlity model has that programming language is abundant, reliable communications, speed flexibility, interface is various, adaptability is strong, performance is high characteristics.

Description of drawings

Fig. 1 is the utility model CAN bus programmable controller PLC system chart.

Embodiment

The utility model is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

Referring to Fig. 1, be the system chart of the utility model CAN bus programmable controller PLC.Comprise main control part, importation, output and communications portion, main control part forms 2 by microcontroller MCU1, memory module, the importation is made up of analog quantity load module 3, counter module 4, switching input module 5 and pulse-width signal sampling module 6, output is made up of switching value output module 7 and PWM output module 8, communications portion is made up of USB DLL (dynamic link library) module 9 and CAN communication interface modules 10, and system is by system power supply 11 power supplies.

As an embodiment of the present utility model, main control part microcontroller MCU1 can adopt XC167, data-carrier store can adopt K6R4016, and program storage can adopt AM29F800, and address bus provides the access address for data-carrier store, program storage by address latch.Data bus directly links to each other with memory module 2.In the analog quantity load module 3; analog input signal connects the input end of analog signal mouth of microcontroller MCU1 through NMOS field effect transistor ZVN4106F; in the switching input module 5; field effect transistor NDS335N is as the conversion and the input of negative sense switching signal of voltage and current measurement, and the input of forward switching value is directly connected to the input port of microcontroller MCU1 by protective resistance.Counter module 4 can adopt CPLDXC95108, does counting and frequency measurement by downloading counter code.In the pulse-width signal sampling module 6, input current is through resistance sampling, and the RC filter network is done to be connected to microcontroller MCU1 analog input port after signal amplifies by TLC2274I again.In the USB DLL (dynamic link library) module 9, USB and RS232 bridging chip CH341T are adopted in the USB communication, and the usb data that up-computer sends links to each other with the asynchronous serial port of microcontroller MCU1 through CH341T.CANBUS passes through CANBUS interface chip PCA82C251 at first through the AD4C331 overvoltage protection in the CANBUS communication interface modules 10, is connected to the CANBUS interface of microcontroller MCU1 at last.The output driving power module BSP78 that switching value output module 7 adopts microcontroller MCU1 exports as the negative sense switching value.Pwm signal output module 8 adopts the PWM output driving power module BTS621L1 of microcontroller MCU1, carries out pwm power output.

Claims

1.CAN bus programmable controller, it is characterized in that, comprise main control part, importation, output and communications portion, main control part is made up of microcontroller MCU, memory module, the importation is made up of analog quantity load module, counter module, switching input module and pulse-width signal sampling module, output is made up of switching value output module and PWM output module, and communications portion is made up of USB DLL (dynamic link library) module and CAN communication interface modules; Described microcontroller MCU and memory module, USB DLL (dynamic link library) module, CAN communication interface modules sum counter two-way connection of module, receive and send data and instruction, with analog quantity load module, switching input module with the pulse-width signal sampling module is unidirectional is connected, acquired signal, be connected output data with the switching value output module with the PWM output module is unidirectional.

2. CAN bus programmable controller according to claim 1 is characterized in that, described memory module comprises command memory, two parts of data-carrier store.