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  • 标题:Remote acquisition: processing and generation of digital signals for a reversible counter through LabView environment.
  • 作者:Rancea, Irina ; Sgarciu, Valentin ; Stamatescu, Grigore
  • 期刊名称:Annals of DAAAM & Proceedings
  • 印刷版ISSN:1726-9679
  • 出版年度:2009
  • 期号:January
  • 语种:English
  • 出版社:DAAAM International Vienna
  • 摘要:Technological process supervision involves acquisition and monitoring of a large number of parameters. Using and Internet connection one can store these parameters in high performance data bases for future processing. This paper is focusing on a solution for acquisition, processing and generation of digital signals using reversible counters, designed for long distances.
  • 关键词:Circuit design;Counters (Circuits);Counters (Electronics);Data collection;Data entry;Signal processing

Remote acquisition: processing and generation of digital signals for a reversible counter through LabView environment.


Rancea, Irina ; Sgarciu, Valentin ; Stamatescu, Grigore 等


1. INTRODUCTION

Technological process supervision involves acquisition and monitoring of a large number of parameters. Using and Internet connection one can store these parameters in high performance data bases for future processing. This paper is focusing on a solution for acquisition, processing and generation of digital signals using reversible counters, designed for long distances.

2. SYSTEM ARCHITECTURE

2.1 Hardware Resources

The system uses a plug-in board for acquisition/generation of analogical and digital signals, KPCI-3102 provided by Keithley. Its schema (Fig. 1) contains:

* 16 Channel MUX--16 analogical inputs connected to the Gain Amp (amplifier with programmable scale).

* ADC--analogical-digital convertor with controlling the frequency of the conversion clock.

* Tri-state buffers--tri-state memories that allow selection of the analogical channels or their equivalent as digital inputs on two ports of 8 bits.

* Sample input FIFO--FIFO of 1k per each input sampling.

* Bidirectional 8-bit Latch--bidirectional programmable memories for the digital inputs/outputs, ports A and B.

* Multiplying DAC--digital-analogical convertors.

* Trigger Clock Logic; A/D counter 24-bitsl TScan counter 24-bits--digital circuits for extern synchronization of the analogical channels.

* CGL, Channel Parameter--registers.

[FIGURE 1 OMITTED]

[FIGURE 2 OMITTED]

[FIGURE 2 OMITTED]

[FIGURE 3 OMITTED]

[FIGURE 4 OMITTED]

2.2 Application Architecture

The acquisition/generation system is installed and configured on a local workspace; the access to the application server is done through an Internet connection as in Fig.2, Fig.3 and Fig.4. (Shirer, 2001) (Ahmad, 2003) The application has a communication module that is responsible with the remote data transmission. It was developed using NI DataSocket Server-Client communication. (Vlad et. al., 2005)

3. CASE STUDY

3.1 Acquisition of digital signals from a reversible counter

For the acquisition of digital signals two test cases have been taken into consideration--direct counting and reverse counting. The assembly schema is shown in Fig. 5, where:

* GS--TTL rectangular signal generator.

* PCL--board with logical circuits where the counter, the decoder for seven segments and the display with seven segments are mounted.

* SA--power supply 5 V and 1A.

* K--mono-polar switch for applying the TTL input to DC (direct counting) and RC (reverse counting).

* STP-68--board for extern connections, bind through 1:1 CAB-305 cable to the KPCI-3102 connector.

* Sample input FIFO--FIFO of 1k per each input sampling.

* Bidirectional 8-bit Latch--bidirectional programmable memories for the digital inputs/outputs, ports A and B.

The application's front panels are shown in Fig.6 and Fig.7.

[FIGURE 5 OMITTED]

[FIGURE 6 OMITTED]

[FIGURE 7 OMITTED]

3.2 Processing and generation of digital signals for a numerical display

The application consists in a structure of binary counter on four ranks, a decoder for seven segments and a display on seven segments that will command the seven segments display SN7545. The assembly schema is shown in Fig. 8, where:

* PCL--board with logical circuits where the counter, the decoder for seven segments and the display with seven segments are mounted.

* SA--power supply 5V and 1A.

* STP-68--board for extern connections, bind through 1:1 CAB-305 cable to the KPCI-3102 connector.

[FIGURE 8 OMITTED]

[FIGURE 9 OMITTED]

[FIGURE 10 OMITTED]

The application front panel is shown in Fig. 9.

The application block diagram for generating digital commands on B(1) port is shown in Fig. 10.

The both case studies presented are using the multifunctional board of analogical and digital inputs-outputs KPCI-3102 provided by Keithley compatible with the PC bus.

4. CONCLUSION

The applications were designed and developed to test the possibility of adding remote monitoring. It was used for a series of experiments between several laboratories. From one point of view one can process the experimental data gathered from a real process, but can also see the result of one remote command sent to industrial equipment in the real time. The main part is, as we mentioned at the beginning, the server with the KPCI-3102 board provided by Keithley. The server is able to manipulate multiple applications in the same time.

5. REFERENCES

Adao, A.S. (2004). Highly Digital, Low-Cost Design of Statistic Signal Acquisition in SoCs, Proceedings of Design Automation and Test in Europe, Vol. 3, ISBN 0-7695-20855-3

Ahmad, M.R.; Khan, N.; Hooong, C.C.; Abas, N. (2003). Remote data acquisition through Internet based telemetry, Research and Development. 2003. Scored 2003. Proceedings Student Conference, pp. 237-244, ISBN 07803-8173-4, August 2003

Thomson, E.A.; Acierto, J.; Chavis, A. (2003). Integration of data acquisition hardware into an undergraduate digital signal processing course via the capstone senior design project, Frontiers in Education, Vol. 2, November 2003, DOI 10.1109/FIE.2003.126493

Shirer, D. (2001). Labview 6i Adds Internet Features to Data Acquisition Environment. Computing in Science and Engineering, Vol. 3, No. 4, (July/August 2001), pp. 8-11, ISSN 152109615

Vlad, M.; Sgarciu, V.; Rancea, I. (2005). Acquisition and monitoring of process parameters using Internet, CSCS15 15th International Conference on Control Systems and Computer Science, Politehnica University Bucharest, Vol. 1, pp. 8-14
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