CN202126468U

CN202126468U - Highway addressable remote transducer (HART) loop testing diagnostic instrument

Info

Publication number: CN202126468U
Application number: CN201120223748XU
Authority: CN
Inventors: 翁思健; 顾庆进
Original assignee: Shanghai Institute of Process Automation Instrumentation
Current assignee: Shanghai Institute of Process Automation Instrumentation
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-01-25
Anticipated expiration: 2021-06-29

Abstract

The utility model relates to a highway addressable remote transducer (HART) loop testing diagnostic instrument, which is in parallel connection with at least one assembly in the HART loop or replaces one or more assemblies to be in series connection to the HART loop. Performance testing and fault diagnosis to the HART loop and on-site instruments can be achieved. A microprocessor unit can analyze data received by a handheld device and located on a communication interface, controls on and off of each functional switch in a functional selecting circuit, and sends or receives data to each functional circuit which is connected with HART loop testing points through switches corresponding to functional selecting circuits. Therefore, performance testing and fault diagnosis to the HART loop can be achieved. Accordingly to communication data formats conventionalized by the microprocessor unit and the handheld device, testing results are arranged to be established formats. The HART loop testing diagnostic instrument provides every function required by the HART loop testing and diagnosis, can guide engineers to operate according to instructions and provide diagnosis conclusion, and improves convenience and accuracy of performance testing and fault diagnosis of the HART loop.

Description

A kind of HART loop-around test diagnostic equipment

Technical field

The utility model relates to a kind of industrial control technology, particularly a kind of HART loop-around test diagnostic equipment.

Background technology

At present, in industrial control system, occupy sizable share based on the control loop of HART field bus protocol, and demonstrate the trend of quick growth.This mainly be since the HART loop both compatible the signal transmission form of traditional analog control loop, many field bus protocol functions peculiar are provided, for example to the Remote configuration of field instrument, fault diagnosis functions or the like again.

Yet consider the complicacy of industry spot environment, the HART loop various faults possibly occur and can't accomplish normal detection and control task in practical work process.The reason that causes loop fault possibly be that certain parts (field apparatus, controller, cable etc.) lost efficacy, and also possibly be that stronger electromagnetic interference (EMI) causes some parts can't operate as normal or the like.

Generally speaking, the field engineer tends to when each assembly carries out performance test and fault diagnosis in to the HART loop by plurality of devices (digital multimeter, tester, oscillograph or the like), and combines the experience of oneself to judge.This way is often more loaded down with trivial details, the shortage convenience, and diagnostic result correctness and slip-stick artist's experience has much relations.The diagnostic result that the problem that the slip-stick artist occurs on judging leads to errors probably, thereby queueing problem in time.

Summary of the invention

The utility model be to the control loop of the complicated HART of the causing field bus protocol of present industrial control system environment for use can't operate as normal problem; A kind of HART loop-around test diagnostic equipment has been proposed; Through the one or more assemblies in itself and the HART loop are in parallel; Or alternative one or more component string are linked in the HART loop; The portable set that can test and diagnose the various assemblies in the HART loop and the various fault that possibly occur, thus help the user to improve the convenience and the accuracy of test of HART loop performance and fault diagnosis.

The technical scheme of the utility model is: a kind of HART loop-around test diagnostic equipment; Comprise a portable equipment, a test module and a test interface; Test module comprises functional circuit, communication interface, function selector circuit, microprocessor unit, power supply unit; Microprocessor unit in portable equipment and the test module is realized data transmission through communication interface; Microprocessor unit input/output port connection function circuit; Microprocessor unit outputs a control signal to function selector circuit, and functional circuit connects test interface through function selector circuit, and test interface is connected to HART loop-around test point in test and diagnostic procedure; Power supply unit is each circuit supply, and functional circuit comprises HART communication main station circuit, HART communication slave station circuit, constant voltage outputting circuit, constant current output circuit, dc voltage measurement circuit, alternating current voltage measuring circuit, dc current measuring circuit, resistance measurement circuit.

Said communication interface can be RS-232, USB, blue tooth interface.

Said portable equipment can be mobile phone, palm PC, panel computer.

The beneficial effect of the utility model is: the utility model HART loop-around test diagnostic equipment; Be used to help the field engineer accurately and timely the HART loop to be tested and diagnostic operation; This equipment provides HART loop-around test and the needed each item function of diagnosis; Can instruct the slip-stick artist to operate and provide diagnosis set by step, improve the convenience and the accuracy of test of HART loop performance and fault diagnosis, its advantage is that other equipment can't match in excellence or beauty.

Description of drawings

Fig. 1 is a representative HA RT loop synoptic diagram;

Fig. 2 is the utility model HART loop-around test diagnostic equipment structural representation;

Fig. 3 is a test module structural representation in the utility model HART loop-around test diagnostic equipment.

Embodiment

Representative HA RT as shown in Figure 1 loop synoptic diagram; Connect through connecting lead 108 comprising system power supply 101, field apparatus 102,250 Ω resistance 103; Main website of DCS system 104 (mainly comprising analog quantity I/O105 and controller 106), HART communication

main station

107 and 103 parallel connections of 250 Ω resistance, field apparatus 102 earth points 109.

Fig. 2 is the general structure synoptic diagram of the utility model.The utility model is made up of a portable equipment 201, a test module 202 and a test interface 203.Realize data transmission through wired or wireless communication mode such as RS-232, USB, bluetooth between portable equipment 201 and the test module 202.Test interface 203 the test with diagnostic procedure in be connected to positions different in the HART loop.Portable equipment has communication interface and man-machine interface.Can be mobile phone, palm PC, panel computer etc., communication interface be used to realize the data transmission between portable equipment and the test module.Man-machine interface makes the user to operate the testing and diagnosing appearance, and checks conclusion and some intermediate informations of test and diagnosis.Portable equipment need be installed the upper computer software that is used to realize to test with diagnostic function.This software guides the user to accomplish associative operation on the one hand, in diagnostic procedure, also need generate diagnosis according to information that obtains and the diagnosis criterion of self on the other hand.

Fig. 3 is the structural representation of test module part in the utility model, and this module is made up of HART communication main station circuit 301, HART communication slave station circuit 302, constant voltage outputting circuit 303, constant current output circuit 304, dc voltage measurement circuit 305, alternating current voltage measuring circuit 306, dc current measuring circuit 307, resistance measurement circuit 308, filtering circuit 309, function selector circuit 310, (and between portable equipment) communication interface 311, microprocessor unit 312, power supply unit 313.Wherein:

HART master station communication circuit 301 is realized the Physical layer of HART communication protocol main website; HART slave station communication circuit 302 is realized the Physical layer of HART communication protocol slave station.The core of this two parts circuit all is the modem chip that meets the HART physical layer specification, can shared a part of circuit.

Constant voltage outputting circuit 303 can be exported constant voltage or electric current as required with constant current output circuit 304.The design of isolating be can adopt, security and the fault-tolerance used improved with the test module internal electric source.

Dc voltage measurement circuit 305, alternating current voltage measuring circuit 306, dc current measuring circuit 307, resistance measurement circuit 308 are used to measure various electrical quantities.These circuit also can shared as required a part of circuit.

Function selector circuit 310 has comprised the on-off element of some level controls, can between various communications, output, metering circuit, carry out switching combining according to different tests and diagnostic requirements and be connected on the test interface.

Communication interface 311 need be corresponding with the communication interface of portable equipment, thereby realize data transmission between the two.

Microprocessing unit 312 is cores of whole test module.The embedded software that moves on the microprocessor need be realized following function: the data to receiving on the communication interface 311 are resolved, and the break-make of each switch in the Data Control function selector circuit 310 that obtains according to parsing; Cooperate the hardware circuit of communication, measurement, output to realize function corresponding; According to and portable equipment between for the agreement of communication data form, the finish message that needs are sent becomes set form.

Power supply unit 313 mainly comprises battery and some voltage conversion circuits, and effect is for the various electron devices in the test module suitable electric energy to be provided.

Portable equipment is selected the iPAQ112 of Hewlett-Packard palm PC for use, and Chinese WinCE operating system has bluetooth communication interface.Test module is independent research, and wherein core components and parts and chip comprise: a slice AMIS A5191 HART modulation module (HART communication main station and slave station circuit are shared); A MORNSUN IA0512KS-1W isolates voltage stabilizing output module (adopting in the constant voltage outputting circuit); A slice AD421 modulus conversion chip (adopting in the constant-current circuit); A slice AD7799 analog-digital chip (adopting in the metering circuit); A bluetooth communication (adopting in the communication interface) of producing by Chongqing golden goblet-national territory company; A slice Freescale MC9S12E64 microprocessor of 16 bit (microprocessor unit employing); One group of 6V, 10000mA/h rechargeable battery (power supply unit employing).Test interface adopts a subband that the multimeter table rod of banana plug is arranged.

Claims

1. HART loop-around test diagnostic equipment; It is characterized in that; Comprise a portable equipment, a test module and a test interface; Test module comprises functional circuit, communication interface, function selector circuit, microprocessor unit, power supply unit; Microprocessor unit is realized data transmission through communication interface in portable equipment and the test module, microprocessor unit input/output port connection function circuit, and microprocessor unit outputs a control signal to function selector circuit; Functional circuit connects test interface through function selector circuit; Test interface is connected to test point in the HART loop in test and diagnostic procedure, power supply unit is each circuit supply, and functional circuit comprises HART communication main station circuit, HART communication slave station circuit, constant voltage outputting circuit, constant current output circuit, dc voltage measurement circuit, alternating current voltage measuring circuit, dc current measuring circuit, resistance measurement circuit.

2. according to the said HART loop-around test of claim 1 diagnostic equipment, it is characterized in that said communication interface can be RS-232, USB, blue tooth interface.

3. according to the said HART loop-around test of claim 1 diagnostic equipment, it is characterized in that said portable equipment can be mobile phone, palm PC, panel computer.