CN202420662U

CN202420662U - Weight acquisition module

Info

Publication number: CN202420662U
Application number: CN201220033783XU
Authority: CN
Inventors: 陈跃新
Original assignee: CHANGSHA DAHENG INTELLIGENT TECHNOLOGY Co Ltd
Current assignee: CHANGSHA DAHENG INTELLIGENT TECHNOLOGY Co Ltd
Priority date: 2012-01-17
Filing date: 2012-01-17
Publication date: 2012-09-05
Anticipated expiration: 2022-01-17

Abstract

The utility model discloses a weight acquisition module comprising a signal amplifying circuit, an AD conversion circuit, a CPU (central processing unit), an LED (light-emitting diode) driving circuit, a crystal oscillation reset circuit, an RS485 driving circuit and a power circuit, wherein the input weight signal is amplified by the signal amplifying circuit and then is output to the AD conversion circuit; the AD conversion circuit converts the weight analog signal to the digital signal and then outputs the digital signal to the CPU; the CPU performs data processing and data storage; and the output is connected with the LED driving circuit and is connected with the crystal oscillation reset circuit and the RS485 driving circuit to perform digital information communication; the RS485 driving circuit is connected with a PLC (programmable logic controller) interface externally; the power supply circuit provides working voltage for system hardware. The weight acquisition module can record PLC system data, has strong data processing ability, is high in concentration, low in cost, convenient and quick, and has high reliability and excellent technical performance.

Description

A kind of Weight acquisition module

Technical field:

The utility model relates to electronic measuring technology field, is specifically related to a kind of Weight acquisition module, is widely used in weighing and burden, mixing plant etc. and needs high-precision multi-path weight measurement place.

Background technology:

Traditional PLC system uses for data recording to design; In order to satisfy the demand that data are preserved; Need fill up this blank to the PLC system by means of the computing machine that connects standard; So, just need be added in the original system and to add additional hardware and software module, thereby make and often be difficult in narrow and small workspace originally to make up, to debug and safeguard complication system.

The data recordin module of some main flow PLC manufacturers releases mainly contains two big types at present: the one, and adopt communication interface to be connected with PLC; PLC gives data recordin module through the data distributing that external communication interface will be preserved, thereby realizes data recording, and these logging modles all are to be independent of the PLC system basically; The speed of data recording is slower; Real-time is relatively poor, is difficult to satisfy the real-time requirement of high-speed record, and cost is higher usually; Another kind of is the data recordin module of using to some specific industry specially; Like vehicle carried driving registering instrument, steamer drive recorder, crane logout appearance, industry data recording requirement under this type satisfies usually, but all belong to tailor-made product; Versatility is not strong; And carry data acquisition function usually, be independent of the PLC system, additional data acquisition function has improved the cost of product.

Summary of the invention:

The utility model technical matters to be solved is: solve the problem that above-mentioned prior art exists, and a kind of PLC of aiming at system data record is provided and the low cost of design, convenient fast, high reliability Weight acquisition module.

The technical scheme that the utility model adopts is: this Weight acquisition module comprises signal amplification circuit, A/D convertor circuit, CPU, led drive circuit, crystal oscillator reset circuit, RS485 driving circuit and power circuit; The weight signal of input circuit after signal amplifies amplifies output and connects A/D convertor circuit; A/D convertor circuit converts the weight simulating signal digital signal output into and connects CPU, and CPU carries out data processing and data storage; Output connects led drive circuit; And being connected communication with crystal oscillator reset circuit, RS485 driving circuit, the external PLC interface of RS485 driving circuit, power circuit are that each hardware of system provides WV.

In the technique scheme, described CPU adopts 16 MSP430F1611 single-chip microcomputers, and running frequency 8MHz, chip integration become the data-carrier store of 10K * 8its and the program storage of 48K * 8its.

In the technique scheme; Described power circuit uses the LM7805 and the LM7905 of ST brand, and LM7805 is the integrated IC of voltage stabilizing output+5V, and LM7905 is the integrated IC of voltage stabilizing output-5V; The maximum current 1.5A that they can provide, working temperature can reach-45 and spend+125 degree.

In the technique scheme; Described RS485 driving circuit adopts the photoelectricity isolation method; Realize the interface between data recordin module and the PLC, data recordin module can connect data in the logging modle of on PLC, fetching data through the RS485 interface of stube cable and PLC.

In the technique scheme, described led drive circuit expansion IO mouth direct and CPU drives output, provides power supply status, running status and the fault of data recordin module to show.The corresponding LED light of each weight passage, if passage has fault, or then corresponding LED lamp is normal bright often to go out, if passage is normal, then corresponding LED lamp is with the frequency scintillation of 1HZ.

In the technique scheme, described A/D convertor circuit has used 24 AD conversion chip ADS1248, carries out the AD conversion after inner integrated AVG amplifies signal again, and inside can provide reference power source, and peripheral circuit is simple, and the AD inversion frequency is adjustable, good stability.

In the technique scheme, described crystal oscillator reset circuit uses the ADM809 integrated IC that resets, and crosses when low automatically when detecting supply voltage that low level of output let MCU reset, and makes system can be operated in the state of stability and safety for a long time.

Advantage and good effect:

1, use the isolation RS 485 communication, communication speed is faster, and is more reliable, or when communication cable ran into moment forceful electric power thunderbolt, CPU still can gather weight data normally;

2, integrated with the PLC system height, rely on the Mai Ge MC200 of Mitt USA Corporation series of PLC technology, can read the weight data of Weight acquisition module through the instruction of PLC, easy to connect quick;

3, the Weight acquisition module has adopted the one-board structure, and all hardware circuit is integrated on the circuit board, advantages of small volume, and anti-seismic performance is good, water proof and dust proof;

4, adopt the inner Flash storage of CPU data, storage space is near the program storage of 48K, and up to 10K byte data storer, data-handling capacity is more reliable sooner.

Description of drawings:

Fig. 1 is the utility model structural principle block diagram;

Fig. 2 is the utility model principle of work process flow diagram.

Embodiment:

Referring to Fig. 1, Fig. 2, the utility model comprises signal amplification circuit A/D convertor circuit, CPU, led drive circuit, crystal oscillator reset circuit, RS485 driving circuit and power circuit, and the output after signal amplification circuit amplifies of the weight signal of input connects A/D convertor circuit; A/D convertor circuit is a digital signal with the weight analog signal conversion, and output connects CPU, and CPU carries out data processing and data storage; Output connects led drive circuit, and is connected with crystal oscillator reset circuit, RS485 driving circuit, carries out numerical information communication; The external PLC interface of RS485 driving circuit, power circuit are that each hardware of system provides WV, and above-mentioned CPU adopts 16 MSP430F1611 single-chip microcomputers; Running frequency 8MHz, chip integration become the data-carrier store of 10K * 8its and the program storage of 48K * 8its, and above-mentioned power circuit uses the LM7805 and the LM7905 of ST brand; LM7805 is the integrated IC of voltage stabilizing output+5V; LM7905 is the integrated IC of voltage stabilizing output-5V, the maximum current 1.5A that they can provide, and working temperature can reach-45 and spend+125 degree; Described RS485 driving circuit adopts the photoelectricity isolation method; Realize the interface between data recordin module and the PLC, data recordin module can connect data in the logging modle of on PLC, fetching data through the RS485 interface of stube cable and PLC; Described led drive circuit expansion IO mouth direct and CPU drives output, provides power supply status, running status and the fault of data recordin module to show.The corresponding LED light of each weight passage, if passage has fault, or then corresponding LED lamp is normal bright often to go out; If passage is normal, then corresponding LED lamp is with the frequency scintillation of 1HZ, and described A/D convertor circuit has used 24 AD conversion chip ADS1248; Carry out the AD conversion after inner integrated AVG amplifies signal again, inside can provide reference power source, and peripheral circuit is simple; The AD inversion frequency is adjustable, and good stability, above-mentioned crystal oscillator reset circuit use the ADM809 integrated IC that resets; Cross when hanging down and low level of automatic output to let MCU reset when detecting supply voltage, make system can be operated in the state of stability and safety for a long time.

Claims

1. Weight acquisition module; It is characterized in that: comprise signal amplification circuit, A/D convertor circuit, CPU, led drive circuit, crystal oscillator reset circuit, RS485 driving circuit and power circuit, the weight signal of input circuit after signal amplifies amplifies back output and connects A/D convertor circuit, and A/D convertor circuit is a digital signal with the weight analog signal conversion; Output connects CPU; CPU carries out data processing and data storage, and output connects led drive circuit, and is connected communication with crystal oscillator reset circuit, RS485 driving circuit; The external PLC interface of RS485 driving circuit, power circuit are that each hardware of system provides WV.