CN202632075U

CN202632075U - Bus-based intelligent measurement and control module

Info

Publication number: CN202632075U
Application number: CN2012202213884U
Authority: CN
Inventors: 唐劲天; 蔡东阳; 卓子寒; 王婕; 武建安
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2012-05-15
Filing date: 2012-05-15
Publication date: 2012-12-26
Anticipated expiration: 2022-05-15

Abstract

The utility model discloses a bus-based intelligent measurement and control module and belongs to the field of industrial measurement control. The bus-based intelligent measurement and control module comprises a signal conditioning circuit, a bus communication module, an interface isolation protection circuit, a control acquisition unit and bus connectors. The bus-based intelligent measurement and control module is characterized in that the signal conditioning circuit transforms various signals into voltage signals through an instrument operational amplifier and a current voltage conversion chip, the control acquisition unit is centered around an automatic voltage regulation (AVR) single chip microcomputer and collects the voltage signals, the control acquisition unit revises and deals with results through an internal transducer electronic data sheet (TEDS), and then data is transmitted to an upper computer through the bus communication module. The interface isolation protection circuit is used to protect a bus, interconnection of equipment is achieved by the bus connectors, and the bus connectors are input and output physical interfaces of a power supply and a data bus of the measurement and control module. The bus-based intelligent measurement and control module has the advantages of reducing cost, achieving high-efficiency measurement control of industrial equipment, and being high in reliability and transparent in a communication protocol.

Description

The bus type intelligent control module

Technical field

The utility model belongs to commercial measurement control field, relates to bus communication formula survey control technology, signal condition and acquisition technique.

Background technology

Equipment such as industry or medical treatment have used various control modules owing to need demands such as real-time Information Monitoring, control in real time at device interior in a large number.Company's industry control modules such as wherein big producer such as Siemens are occupied the very big market share.In actual the use; Because company's industry control modules such as existing Siemens adopt the communications protocol and the data layout of intra-company's research and development more; Can't realize flexibly transparent data transmission,, cost an arm and a leg in case use this generic module then need buy package; Simultaneously the TT&C system volume is also uncontrollable, and the controller of different manufacturers and module can't realize interconnected.

For realizing the standardization of sensor and transmitter; IEEE technical committee has proposed the series of standards of Design of Smart Sensor; Wherein (Transducer Electronic Data Sheet TEDS) has realized the function of transmitter data storage, processing and plug and play to electronic data sheet.

Industry spot often need be gathered multiple signal, simultaneously like ac voltage signal, current signal, pulse signal etc.; And need carry out various control, like flow control, power control, spacing control etc.Adopt the module of simple function, can cause AM access module too many, equipment volume is difficult to control.

Patent 00221742.2 has been announced a kind of " the plug-and-play measurement and control module in the RS-485 bus type TT&C system ", and it has mainly realized the real-time response that module inserts, and can not realize Intelligent Recognition.

Patent 00112532.X has announced a kind of " plug-and-play method and the control module thereof of control module in the RS-485 bus type TT&C system "; It mainly is to have realized timely identification and the management that module inserts through self-designed communication mode and agreement; Owing to be not to adopt the puppy parc Standards and formats, can't realize interconnected with other equipment.

Patent 201020199340.9 is announced a kind of " integral intelligent control module "; It is to the Hall current sensor design; Communication adopts RS485, RS232 and wireless mode to carry out communication; Intellectuality is mainly reflected in and can makes analysis to the multichannel current changing signal, can not realize the simultaneously treated demand of multiple signal.

Patent 201010206443.8 has been announced a kind of " Fieldbus Based multifunctional measurement and control module "; It can realize the selection input of multiple signals; Cost with this step-down amplifier; And through Modbush or the output of Profibus-DP fieldbus, but this module does not relate to intelligentized design, can't realize plug and play.

Summary of the invention

For realizing above-mentioned purpose, the utility model provides a kind of bus type intelligent control module, comprises signal conditioning circuit, bus communication module, interface buffer circuit, control collecting unit, bus contact.Signal conditioning circuit is a core with the instrument amplifier, and the original signal of importing is treated to the signal that collecting unit can be gathered.The control collecting unit is the collection that core is accomplished power management, data with the single-chip microcomputer; And data transfer is gone out through bus communication module; Bus communication module adopts the CAN bus to realize transparent data transmission, has accomplished the mutual of interface microcontroller and EBI.The interface isolation module carries out protections such as surge, electrostatic prevention, short circuit to bus communication module, improve the reliability of system, prolongs the physical life of communication module.Bus contact has defined data line and power lead, realizes the access of control module.

The utility model is characterized in that; The control collecting unit is core with the single-chip microcomputer; Single-chip microcomputer is through transmitter electronic data sheet (Transducer Electronic Data Sheet; TEDS) realize plug and play, Intelligent Recognition, and give host computer with on-the-spot observing and controlling information through the CAN bus transfer through improved ModBus communications protocol.

Signal conditioning circuit can be handled simultaneously and exchange millivolt voltage signal, ac current signal, 4-20mA current signal, pulse voltage signal.Comprise that signal amplifies the rectification circuit of AC/DC, the isolation input function of pulse signal.Unified after the signal Processing is voltage signal, sends into the control collecting unit then and handles.AC signal adopts instrument amplifier AD620 or INA116 as amplifier, and enlargement factor 10-100 doubly; The 4-20mA current signal adopts RCV420 to change core as current/voltage, the voltage range 0-5V after the conversion; Pulse voltage signal is through high-speed isolated optocoupler 6N137 input control collecting unit;

The interface buffer circuit adopts the TVS pipe, common mode choke, and the PTC thermistor is as the protection core;

Bus communication module adopts UART to change the CAN mode, adopts Zhou Ligong CSM100 to transmit through the mode of industrial bus as the serial data of UART commentaries on classics CAN module with single-chip microcomputer, realizes the data reliable delivery, improves the stability that industry spot is used;

It is core that the control collecting unit adopts the AVR single-chip microcomputer, comprises power management, analog quantity and digital data acquisition, based on the electronic data sheet TEDS of single-chip microcomputer internal storage.The two-wire system serial line interface is given bus communication module with data transfer.

Bus contact adopts the DB9 joint, and data line and power lead all insert through joint.

The beneficial effect of the utility model is, when reducing cost, realizes the efficient measurement control of commercial unit, and reliability is high, and communications protocol is transparent, and volume is little.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute qualification of the present invention.In the accompanying drawings:

Fig. 1 is the synoptic diagram of the utility model.

Fig. 2 is the circuit theory diagrams of signal conditioning circuit.

Fig. 3 is bus contact and pinout.

Fig. 4 is an interface isolation protective circuit schematic diagram.

Embodiment

See also shown in Figure 1ly, the utility model bus type intelligent control module comprises signal conditioning circuit, bus communication module, interface buffer circuit, control collecting unit, bus contact.

Signal conditioning circuit can be handled simultaneously and exchange millivolt voltage signal, ac current signal, 4-20mA current signal, pulse voltage signal, and concrete function comprises, isolation, amplification, rectification.Bus communication module is accomplished bus communication, and the interface buffer circuit is protected EBI, and the control collecting unit is the core of data processing, communication, and bus contact adopts and defines each input and output pin like Fig. 2.

The control collecting unit is based on the AVR chip microcontroller, and the storage space of portion has designed the intellectuality of an electronic data sheet TEDS realization control module within it.Power management is realized with bus power source step-down output, for system provides positive-negative power.Single-chip microcomputer is digital quantity through analog quantity, digital data acquisition interface with the conversion of signals of conditioning, and proofreaies and correct through electronic data sheet TEDS, then the data of handling is transmitted through bus communication module according to the Modbus communications protocol.The information of control collecting unit electronic data sheet TEDS can be read through bus by host computer, realizes the automatic identification of module.

Preferably, said bus communication module adopts Zhou Ligong UART to change CAN product module CSM100;

Preferably, said control collecting unit serves as the control core with technical grade AVR single chip computer AT MEGA128;

Preferably, said signal conditioning circuit adopts instrument amplifier AD620/INA116 as amplifier.Precise rectification circuit is an amplifier with OP97, converts AC signal into direct current signal; The 4-20mA signal adopts the RCV420 chip to convert d. c. voltage signal into; The light-coupled isolation input adopts 6N137 to realize.

Claims

1. a bus type intelligent control module comprises signal conditioning circuit, bus communication module, interface buffer circuit, control collecting unit, bus contact; Signal conditioning circuit is the manageable signal of collecting unit with the original signal conditioning of input; The control collecting unit is accomplished power management; The collection of data; And through bus communication module data transfer is gone out, bus communication module has been realized transparent data transmission, has accomplished the mutual of interface microcontroller and EBI; The interface isolation module is protected bus communication module, and bus contact has defined data line and power lead, realizes the access of control module.

2. bus type intelligent control module as claimed in claim 1 is characterized in that: signal conditioning circuit is to exchanging millivolt voltage signal, ac current signal, 4-20mA current signal, four kinds of input signals of pulse voltage signal.

3. bus type intelligent control module as claimed in claim 2 is characterized in that: AC signal adopts instrument amplifier AD620 or INA116 as amplifier.

4. bus type intelligent control module as claimed in claim 2 is characterized in that: the 4-20mA current signal adopts RCV420 to change core as current/voltage.

5. bus type intelligent control module as claimed in claim 2 is characterized in that: pulse voltage signal is through high-speed isolated optocoupler input control collecting unit.

6. bus type intelligent control module as claimed in claim 1 is characterized in that: bus communication module adopts UART to change the CAN module.

7. bus type intelligent control module as claimed in claim 1 is characterized in that: the interface buffer circuit adopts the TVS pipe, common mode choke, and thermistor is as the protection core.

8. bus type intelligent control module as claimed in claim 1 is characterized in that: the control collecting unit is a core with the AVR single-chip microcomputer, and the electronic data sheet TEDS of single-chip microcomputer internal storage space design is as the core of Intelligent Recognition.