摘 要

本系統(tǒng)根據(jù)現(xiàn)實生產(chǎn)生活中的供水要求，以管道內(nèi)壓力為控制對象，對多個水泵的開關(guān)進行總體控制，設(shè)計了一套基于PLC的恒壓供水系統(tǒng), 使其能夠運行在合理、節(jié)能、高效的方式。

本系統(tǒng)主要是通過對供水泵的運轉(zhuǎn)狀態(tài)進行控制，系統(tǒng)內(nèi)包含四臺水泵。它們組成循環(huán)運行方式，運行切換采用“先啟先?！钡脑瓌t?？删幊踢壿嬁刂破饔糜诳刂聘魉玫拈_關(guān)切換來改變供水量，從而保證整個供水管道中的壓力維持在一個規(guī)定的范圍內(nèi)，可以可靠的實現(xiàn)對供水系統(tǒng)的自動化控制。

本論文首先就恒壓供水系統(tǒng)概念、PLC概念等做簡單介紹，然后分別對本系統(tǒng)的硬件部分和軟件部分的設(shè)計做重點分析，以現(xiàn)有理論成果為出發(fā)點，力求能解決現(xiàn)實生產(chǎn)生活中的恒壓供水問題。

關(guān)鍵詞：PLC，自動化，恒壓供水

ABSTRACT

In accordance to real life's request, this system uses the water pressure as its control object. It controls some switches of water pumps so that it can form a stable system. This system is based on PLC. We hope that it can run reasonable and efficient.

This system focuses on the running condition of the water pumps. The system contains four pumps. These pumps work in cycle operation. To start first stop is their running principle. PLC controls the switches of these pumps so that it can keep the balance of the volume of water. By this way, the pressure of water can be in a stable range. We can control the water system in the form of automation.

To begin with, this paper explains the concept of constant pressure water and PLC. Secondly, the paper explains the design of the hardware and software of the system. The system is based on existing theoretical basis. I hope that this system can make contribution to dealing with problems of the stable water system.

Key words: PLC, automation, constant pressure

目 錄

1引言 1

2恒壓供水系統(tǒng)概述 1

2.1恒壓供水系統(tǒng)介紹 1

2.2恒壓供水系統(tǒng)使用的領(lǐng)域 2

3 PLC概述 2

4恒壓供水系統(tǒng)整體分析 3

4.1 PLC應(yīng)用系統(tǒng)開發(fā)流程 4

4.2實現(xiàn)目標(biāo) 4

4.3解決思路 4

4.4控制需求分析與硬件設(shè)計 5

4.5邏輯分析與程序設(shè)計 5

4.6總結(jié)與評價 6

5恒壓供水系統(tǒng)硬件設(shè)計 6

5.1明確系統(tǒng)的控制要求 6

5.2分析I/O設(shè)備 7

5.3系統(tǒng)控制電路圖 7

6軟件設(shè)計 9

6.1 STEP 7-Micro/WIN編程軟件 9

6.2恒壓供水系統(tǒng)PLC控制程序 9

6.3程序編譯結(jié)果 11

7 S7-200 PLC仿真 12

7.1 S7-200 PLC仿真軟件簡介 12

7.2 S7-200 PLC程序仿真步驟 12

7.3恒壓供水系統(tǒng)仿真 13

8結(jié)束語 18

參考文獻 19

致 謝 20