CN204440065U

CN204440065U - A kind of SCM Based data collector

Info

Publication number: CN204440065U
Application number: CN201420730202.7U
Authority: CN
Inventors: 王永刚; 胡晶
Original assignee: Harbin Jindu Solar Energy Technology Co Ltd
Current assignee: Harbin Jindu Solar Energy Technology Co Ltd
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2015-07-01
Anticipated expiration: 2024-11-26

Abstract

The utility model relates to a kind of SCM Based data collector, comprises PC monitoring equipment, on-the-spot main control computer and intelligent acquisition point module, and described intelligent acquisition point module comprises data acquisition unit, data display unit and CAN communication unit; Described main control computer comprises I/V converter, A/D converter, primary controller, sound and light alarm and display, CAN controller, transmitting-receiving driving and CAN; The design philosophy that this system is taked " dividing and ruling ", has gone the intelligent processing unit that mechanical floor is given in data acquisition and partial data Processing tasks, and monitoring, diagnosing layer primary responsibility monitors and fault diagnosis.The utility model is by the result of each intelligent acquisition point acquisition process spot sensor and show current alarm condition according to setting alarming line, and to being transmitted the state of current collection point to on-the-spot main control computer by fieldbus, main control computer is according to respectively carrying out print result, the warning of ring sound from the state of machine, process accordingly to PC monitoring equipment transmission information etc.

Description

A kind of SCM Based data collector

Technical field

The utility model relates to a kind of device carrying out environmental data information acquisition, especially a kind of device adopting the environmental data information acquisition of CAN based on Single-chip Controlling.

Background technology

Field bus control system is an open communication network, is again a kind of full distributed control system.It is as the contact tie of smart machine, and being articulated in bus, the smart machine as network node connects for network system, and forms automated system further, realize basic controlling, compensation calculation, parameter modification, report to the police, display, the synthesis automation function of control and optimize and integrated control and management.This is a collection embedded system, controls, computing machine, digital communication, the complex art that network is integrated.

Fieldbus is alternatively the edge product of Industry Control and computer network.From rationalistic angle, it should belong to network category.But present network technology can not adapt to the requirement of industrial field control system completely.It is no matter the structure from network.Agreement, real-time, or adaptability, dirigibility, reliability and even cost etc., the bottom of Industry Control has its singularity.Its scale of fieldbus should belong to LAN (Local Area Network), bus type structure, and it is simple but can meet the requirement at scene.The information frame that fieldbus will transmit is all short and small, and require that real-time is very strong, reliability is high.But because the environmental interference factor at scene is many, some is very strong and with sudden, these factors all determine the characteristic of fieldbus.

Research emphasis about cruising inspection system concentrates in long-distance transmissions, and system in the past mainly utilize RS-232 serial and RS-485 or the two converge net, its advantage is cheap, easy to use.But main limitation is that transmission range is short, RS-232 only reach tens meters at most, and RS-485 also can only reach 1200 meters at most, can't meet the needs of long distance, interior communication on a large scale.

In recent years, fieldbus achieves significant progress, and field bus system (FCS) is also the basis of following networked development of enterprises.FCS does not need a central control unit to come centralized control and operation, but is controlled and communication task by smart devices.The network service of control and on-site signal in real time can be solved preferably.Because the China that is applied in of fieldbus is also in the starting stage, field bus device is also very expensive, cruising inspection system uses also unrealistic.But combined with single-chip microcomputer (MCU) by the device being exclusively used in communication in field bus technique, then can realize digital communication, thus make system have the series of advantages of FCS, the ratio of performance to price reaches optimum.

Utility model content

The purpose of this utility model is to design a kind of Distributed Control System (DCS) based on CAN.The design is by the result of each intelligent acquisition point acquisition process spot sensor and show current alarm condition according to setting alarming line, and to being transmitted the state of current collection point to on-the-spot main control computer by fieldbus, main control computer is according to respectively carrying out print result, the warning of ring sound from the state of machine, process accordingly to PC monitoring equipment transmission information etc.

The purpose of this utility model is achieved in that

A kind of SCM Based data collector, it is characterized in that: this device is made up of PC monitoring equipment, on-the-spot main control computer and intelligent acquisition point module, described on-the-spot main control computer comprises I/V converter, A/D converter, primary controller, sound and light alarm and display, CAN controller, transmitting-receiving driving and CAN; Described I/V converter connects A/D converter, and A/D converter is connected with controller, and described transmitting-receiving drives and is connected with CAN and CAN control, and CAN control linkage has primary controller, and primary controller connects sound and light alarm and display.

Described controller is made up of AT89C52 single-chip microcomputer and reset circuit thereof; Described data acquisition unit is made up of sensor.

Design feature of the present utility model and beneficial effect are: 1, this utility model is for the collection warning device of environmental data, adopt the Distributed Control System (DCS) of the communication modes of CAN, communication is simple, has the advantages that real-time is very strong, strong interference immunity, reliability are high; 2, the utility model has a wide range of applications, expansion is strong, suitable change is carried out to the interface circuit of sensor and watchdog routine, just can monitor the temperature of large granary, the monitoring of humidity, change the object that the concentration of toxic gases in factory's production room, the monitoring of humidity etc. are different; 3, control module and signals collecting but and between adopt CAN communication, ensure that the stability of Signal transmissions; 4, single-chip microcomputer and CAN controller SJA1000 share same reset circuit, simplify circuit design, reduce the volume and weight of whole device.

Accompanying drawing explanation

Fig. 1 is system principle structural drawing of the present utility model.

Fig. 2 is intelligent acquisition node principle assumption diagram of the present utility model.

Fig. 3 is the interface circuit schematic diagram of CAN of the present utility model and single-chip microcomputer.

Fig. 4 is CAN controller initialize routine process flow diagram.

Fig. 5 is the interface circuit schematic diagram of AD and single-chip microcomputer.

Embodiment

Below in conjunction with accompanying drawing, principle of the present utility model and concrete annexation are described in more detail:

Embodiment 1

Composition graphs 1, Fig. 1 is system principle structural drawing of the present utility model;

Described communication modes adopts CAN communication; Take the design philosophy of " dividing and ruling ", the intelligent processing unit that mechanical floor is given in data acquisition and partial data Processing tasks has gone by it, and monitoring, diagnosing layer primary responsibility monitors and fault diagnosis; Fieldbus Based distributing system is by the result of each intelligent acquisition point acquisition process spot sensor and show current alarm condition according to setting alarming line; Transmitted the state of current collection point to on-the-spot main control computer by fieldbus, main control computer is according to respectively carrying out print result, the warning of ring sound from the state of machine, process accordingly to PC monitoring equipment transmission information etc.

Single-chip microcomputer is the center processor of whole circuit in systems in which, is again the upper control machine of CAN node; CAN controller externally provides the interface with the physical circuit of microprocessor, and by the programming to CAN controller, CPU can arrange its working method, controls his duty, carries out transmission and the reception of data.

Embodiment 2

Fig. 2 is system program process flow diagram of the present utility model;

Intelligent acquisition point comprises data acquisition, display, CAN communication unit composition; Main control computer design comprises, sound and light alarm, CAN communication, serial communication, field data back up and PC monitoring unit; The result of collection point acquisition process spot sensor also shows current alarm condition according to setting alarming line, and to being transmitted the state of current collection point to on-the-spot main control computer by fieldbus.

Embodiment 3

Fig. 3 is the interface circuit schematic diagram of CAN of the present utility model and single-chip microcomputer;

SJA1000 is as independently CAN controller, and PCA82C250 is as transceiving driver; The AT89C52 single-chip microcomputer quartz oscillator of a 12MHz, the SJA1000 quartz oscillator of a 24MHz provides; The interrupt output of SJA1000 connects the interruption 1 of AT89C52, carries out exchanges data with single-chip microcomputer, CAN controller; TX1 does not use, floating, and RX1 is floating not; Bus two ends must connect two terminals and mate 200 Europe resistance RT; A pair smooth lotus root is added between SJA1000 and driver PCA82C250; The TX1 pin of SJA1000 is unsettled, and the current potential of RX1 pin must maintain on about 0.5Vcc; PCA82C250 is the interface between CAN controller and physical bus, TXD and RXD pin sends the transmission after overdriving and Received signal strength respectively, and its pin 8 (RS) adopts slop control mode.

Embodiment 4

Fig. 4 is CAN controller initialize routine process flow diagram;

Initialize routine mainly arranges the communications parameter of CAN, and system enters reset mode, to mode register, time-division register, accept code register, mask register, bus timing register, export control register carry out initialization.

Embodiment 5

Fig. 5 is the interface circuit schematic diagram of AD and single-chip microcomputer;

First send channel number address to ADDA, ADDB, ADDC, latch channel number address by ale signal, relief START is effective, starts A/D conversion.Both performed " MOVX@DPTR, an A " instruction and produced WR signal, and made ALE START effective, and latched channel number and start A/D conversion.

Claims

1. a SCM Based data collector, it is characterized in that: this device is made up of PC monitoring equipment, on-the-spot main control computer and intelligent acquisition point module, described on-the-spot main control computer comprises I/V converter, A/D converter, primary controller, sound and light alarm and display, CAN controller, transmitting-receiving driving and CAN; Described I/V converter connects A/D converter, and A/D converter is connected with controller, and described transmitting-receiving drives and is connected with CAN and CAN control, and CAN control linkage has primary controller, and primary controller connects sound and light alarm and display.

2. the SCM Based data collector of one according to claim 1, is characterized in that: described controller is made up of AT89C52 single-chip microcomputer and reset circuit thereof; Described data acquisition unit is made up of sensor.