Krmiljenje zalivanja s krmilnikom Simatic S7-222 prek SMS sporočil

ORAŽEM, JANEZ (author), Nedeljković, David (mentor)

V diplomskem delu je predstavljen projekt, ki sem ga izdelal v podjetju Energetika Ljubljana, enota Termoelektrarna Toplarna Ljubljana (TE-TOL). Cilj projekta je bila izdelava uporabniškega krmilnega programa za krmilnik Siemens S7-222, ki uporabniku omogoča daljinsko krmiljenje procesa zalivanja trate na dislociranem območju podjetja TE-TOL. Uporabniški krmilni program skrbi za pravilno delovanje krmilnega sistema ter ustrezno komunikacijo med GSM modemom Siemens TC35i, krmilnikom in uporabnikovim GSM aparatom. Sistem deluje tako, da krmilnik ciklično pregleduje pomnilnik GSM modema. Če GSM modem prejme novo SMS sporočilo, ga krmilnik ob naslednjem pregledu zazna in ustrezno obdela. Kadar se niz v sporočilu ujema s katerim od ukaznih nizov v krmilni kodi, se izvede akcija, ki je temu nizu določena. V nasprotnem primeru se SMS sporočilo izbriše iz pomnilnika GSM modema. V uporabniškem krmilnem programu je zapisana tudi funkcija, ki skrbi, da krmilnik uporabniku pošlje opozorilno SMS sporočilo, ko se odpro vrata omarice, v kateri je nameščen krmilni sistem. Tako je uporabnik obveščen, če pride do poskusa neavtoriziranega posega v krmilni sistem. V diplomski nalogi so predstavljene tehnične lastnosti uporabljenih komponent, izdelava uporabniškega krmilnega programa s programskim orodjem Step 7 Microwin ter njegovo delovanje. Krmilni sistem vzdrževalcem v podjetju prihrani čas, saj eliminira potrebo po ročnem zalivanju trate. Za to lahko poskrbijo s poslanim SMS sporočilom, ne glede na to, kje se nahajajo.

• Language: Slovenian
• Keywords: uporabniški krmilni program, krmilni sistem, Siemens S7-200, GSM modem
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-80081
• Publication date in RUL: 15.01.2016

Secondary language

• Language: English
• Title: SMS-Controlled Irrigation using Simatic S7-222 PLC

Abstract

The thesis presents the project I developed in Termoelektrarna Toplarna Ljubljana (TE TOL) unit of the company Energetika Ljubljana. The goal of the project was to design a program for Siemens S7-222 controller that would enable remote operation of watering lawns at location separate from TE-TOL. The user control program ensures correct functioning of the control system and adequate communication between the Siemens TC35i GSM modem, the controller and the user's GSM device. The controller scans the memory of the GSM modem cyclically. If the GSM modem receives a new SMS text message, the controller detects it during the next scan and processes it accordingly. When the string in the message matches one of the command strings in the control code, the action required by this string is carried out. Otherwise, the SMS text message is deleted from the memory of the GSM modem. Moreover, the control code contains a function which ensures that the controller sends an SMS text message to the user as a warning when the control system cabinet door is opened. Thus the user can be informed about any unauthorised access to the control system. The thesis presents the technical characteristics of the used components, describes the process of creating the user program with the Step 7 Microwin software and provides insight into its functioning. The control system can save considerable amounts of time for maintenance workers because they no longer have to water the lawn manually. They can take care of it by sending an SMS text message, regardless of their location.

• Keywords: user control program, control system, Siemens S7-200, GSM modem