CN201047911Y

CN201047911Y - Remote IO analogue quantity module with Profibus-DP bus interface

Info

Publication number: CN201047911Y
Application number: CNU200520045096XU
Authority: CN
Inventors: 奚培锋; 殷君; 薛吉
Original assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Current assignee: Shanghai Electrical Apparatus Research Institute Group Co Ltd
Priority date: 2005-09-19
Filing date: 2005-09-19
Publication date: 2008-04-16
Anticipated expiration: 2015-09-19

Abstract

The utility model relates to a remote IO analogue module with a Profibus-DP bus interface, and comprises an input module, an output module and a power supply, wherein, the input module consists of an analogue input element, an amplification circuit, an AD conversion circuit and a single-chip computer; the output module consists of a single-chip computer, a DA conversion circuit, an amplification circuit and an analogue output element. The utility model is characterized in that a Profibus-DP network transmitting data element, a Profibus-DP protocol chip and a Profibus-DP network are additionally arranged; the power supply is specially designed and is provided with control software. The signal transmission includes the following steps: the analogue input element transmits a signal to the signal amplification circuit; after converted into a digital signal by the DA conversion circuit, the signal is transmitted into the single-chip computer via an optocoupler; the single-chip computer sends out the received data to data receiving and sending elements on the Profibus-DP protocol chip and the Profibus-DP network, the data being protected through optocoupler isolation; after transmitted by the Profibus-DP network transmitting data element to the Profibus-DP protocol chip, the signal is transmitted into the single-chip computer via the optocoupler and then converted into an analogue signal by the DA conversion circuit; then the single is amplified and the analogue signal is output. The remote IO analogue module is used for detecting and controlling various field arrangements.

Description

A kind of remote I analog module with the Profibus-DP bus interface

Technical field

The utility model relates to a kind of remote I analog module with the Profibus-DP bus interface, belongs to fieldbus remote control technology field.

Background technology

Along with the development of progress of science and technology, modernization industry, people have higher requirement to the control of industrial processes.The main flow direction intelligent, networked, microminiaturized, that the contemporary automated control technology of decentralized representative develops, and field bus technique impels automated system to comply with the advanced technology of this demand for development just.

The Profibus-DP agreement is a kind of general purpose language that is applied on the electronic controller, is one of at present general in the world standard for Fieldbus, and this agreement is divided three parts:

1), PROFIBUS-DP: adopt the communication modes of repeating query between main website and the slave station, be mainly used in the automated manufacturing system cell level and communicate by letter with field level.

2), PROFIBUS PA: power supply and communication data transmit by bus parallel, are mainly used in cell level and field level communication in the procedure-oriented automated system.PROFIBUS FMS: defined the communication model between main website and the main website, be mainly used in the process data exchange of system-level and workshop level in the automated system.

3), PROFIBUS is a general open standard in IEC 61158 and IEC 61784, uses the application apparatus that is in upstream flow journey (comprising raw-material transportation and storage) and the downstream process flow process (comprising logistics and packing) widely.It is that the device of unifying for all Departments of Automation of process plant provides point-to-point, compatible conforming communication platform and fieldbus networks.

The long-range input/output module of VI1TP, be the slave station module of a PROFIBUS-DP, the various field devices that are used for detecting and control industrial control system are as input, the output of digital quantity such as sensor, button, pilot lamp, valve, transmitter or analog quantity type.According to the application scenario of digital quantity signal, product is divided into digital quantity input and digital quantity output type by model; The way of output is divided transistor PNP output, the output of transistor NPN type, relay output type or the like.

PROFIBUS-DP slave station module need be the NPO of Profibus international organization registration ID number, registration GSD block configuration file, and behind the Profibus uniformity test, the popularization that could sell as the certified product of Profibus tissue.

By this agreement, controller each other, controller be via communicating by letter between network and the miscellaneous equipment, and it has become a kind of universal industrial standard.It has been arranged, and the opertaing device that different vendor produces can be linked to be industrial network, carries out Centralized Monitoring.

In general, product all reckons without the consistance that product versatility (consistance of product design) and software relate to both at home and abroad, and this makes troubles just for product up-gradation, seriation, variation.

The utility model content

The purpose of this utility model is to provide a kind of existing product performance that is better than, and considers the remote I analog module of the band Profibus-DP bus interface of product versatility, upgrading.

In order to achieve the above object, the technical solution of the utility model is: hardware comprises analog quantity input and two modules of analog quantity output and power supply; Wherein IO analog quantity load module comprises: the input of IO analog quantity, signal amplification circuit, A/D convertor circuit, single-chip microcomputer; The IO analog output module comprises: single-chip microcomputer, DA change-over circuit, signal amplification circuit, the output of IO analog quantity is characterized in that:

Described analog quantity load module has been set up Porfibus-DP protocol chip (SPC3), Porfibus-DP network; Analog output module has been set up Porfibus-DP network transmission data, Porfibus-DP protocol chip (SPC3).

The mode that IO analog quantity input/output module power supply adopts is the switch vibration that RC adds the field effect pipe, and output power is big, and consumed power is little, output two-way 5V and positive and negative 14V, and one the tunnel is the host CPU power supply, another road is the metering circuit power supply.Other has one road power supply to be got through the DC-DC conversion by 24V, is the communication interface circuit supply.Three-way power is isolated fully.

Software solidification of the present utility model is in hardware CPU single-chip microcomputer.

The beneficial effects of the utility model: input, output signal in the analog quantity of field devices such as the various field devices that are used for connecting industrial control system such as sensor, button, pilot lamp, valve, transmitter can produce useful effect.

Description of drawings

Fig. 1 is the theory diagram of IO analog quantity input of the present utility model and output module;

Fig. 2 is that IO analog module of the present utility model (comprising Fig. 2-1, Fig. 2-2, Fig. 2-3) is host CPU and peripheral circuit schematic diagram among Fig. 1;

Fig. 3 is the concrete schematic circuit of simulated measurement input circuit among Fig. 1;

Fig. 4 is the concrete schematic circuit of analogue quantity output circuit among Fig. 1;

Fig. 5 is IO analog quantity input of the present utility model and output module main program flow chart;

Fig. 6 is IO analog quantity input of the present utility model and output module interrupt routine process flow diagram.

Embodiment

Below in conjunction with accompanying drawing and a preferred embodiment the utility model is done more detailed explanation.

With reference to Fig. 1, this is the theory diagram of IO analog quantity input of the present utility model and output module.

As shown in the figure, IO analog quantity load module comprises: the input of IO analog quantity, signal amplification circuit, A/D convertor circuit, single-chip microcomputer, Porfibus-DP protocol chip (SPC3), Porfibus-DP network send data; The IO analog output module comprises: Porfibus-DP network transmission data, Porfibus-DP protocol chip (SPC3), single-chip microcomputer, DA change-over circuit, signal amplification circuit, the output of IO analog quantity.

Analog quantity input 1 reaches signal with signal and amplifies 2, through analog to digital conversion 3 differential mode is transferred to common mode, as the input of modulus conversion chip MAX1270, be digital quantity through analog to digital conversion after, import CPU single-chip microcomputer 4 into by the light lotus root.Single-chip microcomputer 4 receives that digital data sends to the data transmit-receive on Porfibus-DP protocol chip (SPC3), the Porfibus-DP network, adopts the insulation blocking of light lotus root.

In the analog quantity output, the Porfibus-DP network transmission data imports CPU single-chip microcomputer 4 into by the light lotus root after signal is reached Porfibus-DP protocol chip (SPC3), after process digital-to-analogue chip MAX525 is converted to analog quantity, carries out signal amplification, analog quantity output again.

With reference to Fig. 2 (comprising Fig. 2-1, Fig. 2-2, Fig. 2-3), this is the utility model host CPU circuit, interface circuit, power circuit.

Host CPU circuit described here, refer to single-chip microcomputer 4, after receiving data on the Porfibus-DP network 6, send on the mainboard by parallel port again, isolate digital-to-analogue chip MAX525 through the light lotus root and receive the data that CPU sends, after converting analog quantity to, after amplifier LM348 amplification, by analog quantity output 12 outputs.

Described Porfibus-DP network, the communication modes of employing repeating query is used for system's cell level and on-scene communication between main website and the slave station.

Dial SW is used to measure the switching of electric current and voltage.The range of voltage switches by software control.

The mode that power circuit adopts is the switch vibration that RC adds the field effect pipe, and the input of 24V direct current exports two the tunnel by transformer, isolates fully, and one road 5V is the CPU power supply; Another road is positive and negative 14V, and+14V becomes 5V by 7805, is the device power supply of input port.Another road be 24V through DC-DC change 5V, this road is the power supply of upper layer communication interface.

Add filtering circuit before the amplifier input of analog quantity load module, parameter is selected accurately can provide measuring accuracy, makes the data of analog-to-digital conversion beat very little.

The output area of analog output module is realized by hardware.

With reference to Fig. 3, this is the schematic diagram of simulated measurement input circuit 1 of the present utility model.It comprises that No. four input circuits, analog to digital conversion circuit, photoelectricity isolates several parts.

With reference to Fig. 4, this is the schematic diagram of analogue quantity output circuit 12 of the present utility model.It comprises that No. four output circuits, D/A converting circuit and light lotus root isolate several parts.

The development of analog quantity IO module is carried out on the basis of digital quantity IO module.Connection terminal based on analog module is few, reduces small product size as far as possible, and the profile of 14 terminal products is adopted in modulus, digital-to-analog conversion.The input of analog quantity IO module, output circuit, the direct supply of the positive and negative 14V of needs.Have improved on other power-supply system: on original DC-DC transformer, increase a winding, three taps, obtain positive and negative 14V power supply by filtering after utilizing self-sustained oscillation, one road 5V chip with power supply by 78L05 right+step-down of 14V power supply obtains, another road 5V is directly obtained by the DC-DC chip.

The device that analog quantity IO module adopts is more than digital quantity IO module, requires between each system to isolate each other.

With reference to Fig. 5, this is IO analog quantity input of the present utility model and output module main program flow chart.

As shown in the figure, its flow process is as follows: beginning 13, interrupt response 14 is set, the house dog time 15 is set, initialization 16, trigger house dog 17 to whether having new output data 18 to judge, if arrive equipment 20 to confirmation of receipt 19, output data; If not, write SPC3 input block 21, then, enter SPC3 input block 22, whether have new diagnostic data 23 to judge, if not, turn back to whether new output data 18 is arranged to the input data that slave unit I/O obtains; If, just entering and send diagnostic data to SPC3 24, SPC3 diagnosis buffer zone upgrades 25, turns back to whether new output data 18 is arranged.

With reference to Fig. 6, this is IO analog quantity input of the present utility model and output module interrupt routine process flow diagram.

As shown in the figure, its flow process is as follows: have interrupt to produce 22 and judge to entering/leave data exchange phase 23, if, enter corresponding processing program 24, enter overall control command interruption again and judge 25; If not, then directly enter overall control command and interrupt judging 25, if, enter corresponding processing program 26, enter again and tributary address is set interrupts judging 27; If not, then directly enter and tributary address is set interrupts judging 27, if, enter corresponding processing program 28, enter the new argument data interruption again and judge 29; If not, then directly enter the new argument data interruption and judge 29, if, enter corresponding processing program 30, enter new configuration data again and interrupt judging 31; If not, then directly enter new configuration data and interrupt judging 31, if, entering corresponding processing program 32, interrupt routine finishes 33 again; If not, then directly interrupt routine end 33.

The long-range input/output module of VI1TP is mainly used in the various field devices that connect in the industrial control system as the digital quantity of field devices such as sensor, button, pilot lamp, valve, transmitter and input, the output signal of analog quantity, and can communicate by the Profibus-DP network.Principal feature is as follows:

Adaptive Profibus-DP communication speed is supported 9.6kbps-12Mbps.

Support the DPV0 function of Profibus-DP fully.

Module working power and port power are isolated fully;

The accessory power supply power supply is adopted in input and output, guarantees that bus communication is not subjected to load effect;

Have higher Electromagnetic Compatibility and reliability;

Modular design, compact conformation, easy to use;

Degree of protection IP20.

The long-range input/output module of VI1TP series comprises the analog quantity input/output module that difference is counted, but it but has only a kind of shell of identical size, product design consistance with height, and different module correspondences all is a cover software, so it is product has very high modularization, also very convenient for the production of product.

Claims

1. remote I analog module with the Profibus-DP bus interface, the various field devices that are used for connecting industrial control system are as sensor, button, pilot lamp, valve, transmitter, comprise that input of IO analog quantity and IO analog quantity export two modules and power supply;

Wherein IO analog quantity load module comprises: the input of IO analog quantity (1), signal amplification circuit (2), A/D convertor circuit (3), single-chip microcomputer (4); The IO analog output module comprises: single-chip microcomputer, DA change-over circuit, signal amplification circuit, the output of IO analog quantity is characterized in that:

Described IO analog quantity load module has been set up Porfibus-DP protocol chip SPC3 (5), Porfibus-DP network (6); The IO analog output module has been set up Porfibus-DP network transmission data (7), Porfibus-DP protocol chip SPC3 (8);

The signal transmission of foregoing circuit is: analog quantity input (1) reaches signal with signal and amplifies (2), through analog to digital conversion (3) differential mode is transferred to common mode, input as modulus conversion chip MAX1270, after the process analog to digital conversion is digital quantity, import CPU single-chip microcomputer (4) into by the light lotus root, single-chip microcomputer receives that digital data sends to the data transmit-receive on Porfibus-DP protocol chip SPC3 (5), the Porfibus-DP network (6), adopts the insulation blocking of light lotus root;

In the analog quantity output, after Porfibus-DP network transmission data (7) reaches Porfibus-DP protocol chip SPC3 (8) with signal, import CPU single-chip microcomputer (9) into by the light lotus root, after process analog-digital chip MAX525 conversion (10) is analog quantity, carries out signal again and amplify (11), analog quantity output (12);

Power supply is respectively to single-chip microcomputer and input/output module power supply.

2. the remote I analog module of band Profibus-DP bus interface as claimed in claim 1 is characterized in that:

Described IO analog quantity input comprises No. four input circuits, A/D convertor circuit, photoelectric isolating circuit.

3. the remote I analog module of band Profibus-DP bus interface as claimed in claim 1 is characterized in that:

Described IO analog quantity output comprises No. four output circuits, DA change-over circuit, photoelectric isolating circuit.

4. the remote I analog module of band Profibus-DP bus interface as claimed in claim 1 is characterized in that:

5. the remote I analog module of band Profibus-DP bus interface as claimed in claim 1 is characterized in that:

Described power circuit, the mode of employing are the switch vibrations that RC adds the field effect pipe, the input of 24V direct current, export two the tunnel by transformer, isolate fully, one road 5V is the host CPU power supply, another road is positive and negative 14V, and+14V becomes 5V by 7805, is the device power supply of input port; Other have a power supply by 24V through DC-DC change 5V, this road is the power supply of top plate communication interface.

6. the remote I analog module of band Profibus-DP bus interface as claimed in claim 1 is characterized in that:

Described analog quantity load module is provided with the worry wave circuit before its amplifier input.