Marine fuel boiler system design platform. Hou Ying-ying

Transcription

1 Advanced Materials Research Submitted: ISSN: , Vols , pp Accepted: doi: / Online: Trans Tech Publications, Switzerland Marine fuel boiler system design platform Hou Ying-ying Zaozhuang Vocational College of Science & Technology, TengZhou, Keywords: Signal interface, analog, digital, PLC Design Abstract. This design platform consists of a computer control, signal interface and PLC or IPC and other components. Signal interface consists of analog and digital input and output board composition, these boards are equipped with signal conditioning and terminal board, the input and output to meet industry standards, can be directly connected with the actual computer control system, this article will focus on the signal interface. Introduction There are a lot of marine fuel boilers and analog switches, when the boiler system simulation, it involves a lot of input and output analog switch status and size[1]. The design of the boiler simulation system made of industrial objects connected via simulation platform and actual PLC controller via analog input and digital input boards USB2832 card PCI2310 read control signal PLC controllers into the boiler simulation system, and calculate the corresponding action in the model, and then the switch state model and calculate the analog output board USB2833 and PCI2310 information to the PLC via analog controller as input PLC, constitutes hardware-in -the-loop (HIL) simulation systems. This HIL simulation platform can be used for a variety of test and validate the control system development process, but also as curriculum design, graduate design and other aspects of the control algorithm or the controlled object validation tools in teaching. Platform structure This design platform consists of a computer, signal interface and PLC or IPC and other controller. Signal interface consists of analog and digital input and output board composition, these boards are equipped with signal conditioning and terminal board, the input and output to meet the industry standard, you can connect directly with the actual computer control system, will be the focus of this chapter describes the signal interface[2]. To achieve the controlled object model and the controller signal via signal interface, can be composed of HIL simulation system. Figure1 Computer and PLC connection diagram Figure 1, for example in marine fuel boiler, analog and digital simulation model output signal is the output signal is regarded as the boiler pressure and temperature sensors as the input signal from the controller; analog simulation model inputs and switches semaphore signals seen as a controller for the water supply valve and fuel valve. All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-13/05/16,05:36:35)

2 Advanced Materials Research Vols Signal Interface Analog input data acquisition card. USB2832 is a USB bus-based data acquisition card, the computer is directly connected to the USB interface can be achieved. Can be used in the laboratory and product testing in areas such as data acquisition, waveform analysis and processing systems. USB2832 card with AD, DA, DI, DO, and CNT timer /counter functions, where it's used in the AD analog input function, the AD has the following characteristics[3]: 1) Converter Type: AD7321 2) Input Range: ±10V, ±5V, ±2.5V, 0~10V 3) Conversion Accuracy: 13 (Bit) 4) Sampling rate: Maximum switching frequency 500KHz chip 5) Physical Channels: 32 channels, 16 channels 6) Analog input: Single-ended and double-ended analog input 7) Sampling channels: The end of the channel - the first channel +1 8) Channel switching mode: The first end of the channel in order to switch 9) Acquisition mode: Continuous acquisition 10) Clock: Board internal clock 11) Non-linear error: ±1LSB 12) System Accuracy: 0.1% 13) Operating temperature range: 0 ~+50 Figure2 37-pin D-type connector pin definitions Figure Figure 2, the signal connector pin definitions: AI0 ~ AI31 as analog input pin, when a singleended input, to 32 analog channels; When is a double-ended input, the first 16 to the positive input terminal after 16 corresponding to the negative input terminal is a terminal. AGND analog signal common ground that the analog signal input and output regarded it as a reference. Is a single-ended input channel one signal when multiple signals, they use the same ground. When the number of channels required more environmental disturbance is relatively small and can be used single-ended mode. Figure 3 is a single-ended wiring methods[4].

3 1220 Energy Research and Power Engineering 2014 Figure3 AD single-ended input connection diagram Analog output data acquisition card. USB2833 data acquisition card with AD, DA, DI, DO, CNT timer / counter functions used here its DA analog output function, the DA features are as follows: 1) Converter Type: AD5724 2) Output Range: 0~5V, 0~10V, 0~10.8V, ±5V, ±10V, ±10.8V 3) Conversion Accuracy: 12Bit 4) Number of channels:4 5) Setup time: 10 ms 6) Non-linear error: ±1LSB 7) Operating Temperature: 0 ~+50 The design of the large ones due to be greater than the analog output of 4, used a two USB2833. In order to distinguish between two USB2833, their physical ID number will be set to 0 and 1 respectively. Figure4 37-pin D-type socket pins Figure5 Signal connection method DA analog output Pin defined in Figure 4, USB2833 is: AO0 ~ AO3 analog signal output pins. AGND analog signal, the input and output analog signals it as a reference. In this design does not use the rest of the pins will not repeat them. Figure 5 is a terminal connection methods. Connected to circuit design and PLC In order to match the PLC connection circuit in the switch input circuit and output circuits were added to the ULN2803, namely eight NPN Darlington[5]. ULN2803 internal circuit diagram is shown in Figure 11.

4 Advanced Materials Research Vols Figure 6 with the first switch output DO0 example, on the basis of the actual circuit of Figure 9 plus the external power supply and pull-up resistors, ULN2803 also added the external power supply and pull-up resistors. When the output bdosts [0] is high, the transistor is turned on, the voltage at the collector within PCI2310 low, Darlington is not conducting, DO0 is high. When the output bdosts [0] is low, transistor PCI2310 within the non-conducting, the collector voltage is high. Darlington conduction, DO0 at a low level. Figure6 Witch output adjustment circuit Figure7 Witch input adjustment circuit Figure 7 with the first switch input DI0 road for example, DI0 is high Darlington conduction, the output low emitting diode conduction, and thus the transistor conduction PCI2310 inside, bdists [0] is high. DI0 is low Darlington is not conducting, the output of the high level cannot make lightemitting diode conduction in the transistor PCI2310 have not turned on, bdists [0] is low. Conclusion Industrial object simulation platform in the joint action of the hardware and software of the computer simulation model and PLC control systems to connect and communicate. Complete hardware conditions, the correct tool for the entire design is to achieve security features, and software conditions are a function of the hardware design can be achieved. In connection with the PLC controller also take into account matching of both voltage and current, load capacity issues. Constitute a virtual simulation system with the actual PLC controller connected hardware loop simulation system. When the accuracy of the computer simulation model to reach a certain requirement, this system can be developed or validation controller. References [1] Nei xiu-jun.water control character analysis and design for marine boiler[j]. Journal of wuhan uniwersity of technology.2009(7): [2] Gan Hui-bing,Zhang Jun-dong. Design and realization of simulation system ofmarine boiler based on PLC[J]. Journal of Dalian Maritime University.2006(2):5-7 [3] HU Xian-fu, CHEN Ban-Zhang,XU zhi-de,et al.proceedings of Asian simulation conference[c], 2002: [4] S rensen K,Condra T. Modeling and Simulating Fire Tube Boiler Performance [C]. Proceedings of SIMS th Conference on Simulation and Modeling. Sweden: Malardalen University, 2003:9-12. [5] M E Flynn, M J O Malley. A Drum Boiler Model for Long Term Power System Dynamic Simulation [J]. IEEE Transactions on Power Systems (S ), 1999, 14(1):

5 Energy Research and Power Engineering / Marine Fuel Boiler System Design Platform /