Skip to main content

PLC Program for Traffic Light Control



PLC Program for Traffic Light Control



 

 


Control Purpose:
  • Enabling the traffic lights to work by Start button X0 and to stop by Stop button X1.
  • Setting the time of red light in East-West direction as 60 sec and North-South direction with a heavier traffic as 30 sec.
  • The time of red light in East-West direction equals to the time of “green light + green light flashing + yellow light” in North-south direction, and vice versa.
  • When yellow light is ON, cars and pedestrians should not cross the road, and yellow light will last for 5 sec for the crossing cars and pedestrians to pass safely.

     


·      
Timing diagram of traffic lights in East-West direction:





Timing diagram of traffic lights in North-South direction:




Devices:


Device

Function

X0

Start button

X1

Stop button

T0

60 sec timer. Time base: 100ms

T1

20 sec timer. Time base: 100ms

T2

5 sec timer. Time base: 100ms

T10

50 sec timer. Time base: 100ms

T11

5 sec timer. Time base: 100ms

T12

5 sec timer. Time base: 100ms

T13

30 sec timer. Time base: 100ms

S0

Initial step

S10 ~ S13

Controlling the Traffic lights in East-West direction

S20 ~ S23

Controlling the Traffic lights in North-South direction

Y0

Red light in East-West direction

Y1

Green light in East-West direction

Y2

Yellow light in East-West direction

Y10

Red light in North-South direction

Y11

Green light in North-South direction

Y12

Yellow light in North-South direction


 Ladder Program for Traffic Light Control:





 

 

Program Description:
  • WhenStart is pressed, X0 = ON. PLS instruction will be executed, and M0 will create a rising-edge pulse to set T0. The program will enter the step ladder process.
  • ·  When Stop is pressed, X1 = ON. PLS instruction will be executed, and M1 will create a rising-edge pulse to execute [ZRST S0 S127] instruction. All steps will be reset and all traffic lights will be OFF.
  • This example is designed by the application of the simultaneous divergence sequence. The two sequences running simultaneously are East-West direction and North-South direction.
  • When the red light of East-West direction is ON, the corresponding state of North-South direction will be the sequence of “Green ON”, “Green Flashing” and “Yellow ON.”
  •  When the East-West direction sequence is finished (the yellow light is OFF), the North-South direction sequence will be finished as well (the red light is OFF). The program will return to the initial step S0. 
  • When a step is transferred from one sequence to another sequence, the former sequence will be reset including the step and output point Y.
  • The time of yellow light in East-West direction (Y2) is not controlled by a timer because when the red light in North-South direction is OFF, the yellow light in North-South direction will be reset at the same time. In this case, T13 is ON to redirect the program to initial step S0, and the outputs (Y2 and Y10) corresponding to S13 and S23 will thus be reset.



http://news.chivindo.com/809/plc-program-for-traffic-light-control.html

Comments

Popular posts from this blog

BT-BASIC commands used

8.10     Some of the most frequently used BT-BASIC commands used are: msi                               Changes default working directory. Mass storage is            Same as “msi” cat                               Catalogs (list)the node names in the specified directory.             get                               Brings the contents of a file into the system workspace.             load                             Same as “get”.             msi$                            Returns the directory pathname of the current working directory.             msi “..”                       Backs up one directory level.             findn                            Locates the next occurrence of the a given sting in the workspace. 8.11           If you wish to invoke the HP Board Graphics Viewer, type board graphics at the BT-BASIC command line and press the “ENTER” key on the keyboard. 8.12           A HP Board Graphics Viewer window should now appear

Perhitungan & Cara Merubah Kumparan Blender Dari 220 V Menjadi 12 V

          Seperti yang telah dijelaskan pada buku “menggulung motor listrik arus bolak-balik, servis peralatan listrik rumah tangga kelompok penggerak dan perbaikan peralatan listrik pertukangan”, bahwa motor penggerak yang digunakan pada perlatan listrik rumah tangga dan pertukangan seperti blender, mixer, bor tembak, gerinda dsb menggunakan jenis motor universal. Motor universal adalah jenis motor listrik yang dapat disuplai dengan sumber listrik arus bolak-balik (AC) dan arus searah (DC). Jadi peralatan-peralatan listrik rumah tangga dan pertukangan tersebut yang biasanya kita suplai dengan sumber listrik AC dari PLN atau Genset sebesar 220 V sebenarnya dapat juga kita suplai dengan sumber listrik DC yang tentunya tegangan juga harus sama yakni 220 V.           Yang menjadi permasalahan bagaimana kalau peralatan listrik rumah tangga atau pertukangan tersebut, sebagai contoh misalkan blender yang ingin digunakan atau dioperasikan pada tempat yang tidak terdapat sumber listrik PLN ata

BT-BASIC command line

8.8       At the BT-BASIC command line type the command  msi  and the directory path, then press the “ENTER” key on the keyboard.  Example:                   msi ‘/hp3070/boards/aspect/main’ 8.9       At the BT-BASIC command line type the command  get ‘testplan’ and press the   ENTER” key on the keyboard.  You should now see the body of the testplan file displayed in the work space of the BT-BASIC window. 8.10     Some of the most frequently used BT-BASIC commands used are:

Autodesk SketchBook Pro 2021 Full Version

BAGAS31 – Sesuai dengan namanya, Autodesk SketchBook Pro 2021 Full Version ini merupakan software digital sketching atau drawing terbaik yang bisa kamu gunakan. Pada versi terbaru kali ini, ada beberapa penambahan fitur yang sangat efektif. Dengan fitur baru tersebut, diharapkan mampu meningkatkan proses sketching maupun drawing kamu. Autodesk SketchBook sendiri sudah bisa kamu dapatkan secara gratis melalui website resminya. Namun untuk kamu yang mau download versi Autodesk Sketchbook Pro, maka bisa langsung download melalui link yang sudah saya sediakan di bawah ini. Download Autodesk SketchBook Pro 2021 Full Version Screenshot: System Requirements: Windows 10 2.5 – 2.9 GHz of Intel or AMD CPU 4 GB of Memory 256 MB Graphics card with OpenGL 2.0 support We recommend that you use a pressure-sensitive tablet and pen for basic features Download: Autodesk SketchBook Pro 2021 Full Version [ FileUp ][ Uptobox ][ UsersDrive ] Jamu Only [ FileUp ][ Uptob

Testhead

4.3         Testhead The testhead is that portion of the tester that supports the PIN, ASRU and Controller cards.   The testhead is divided into two BANKS and each BANK is divided into two MODULES, see figure 2 below.  Bank 1 contains modules 0 and 1, bank 2 contains modules 2 and 3.  The test fixtures are placed on the banks of the tester and locked down for board testing.  The testhead cards interface to the test fixture through the spring loaded pogo pin “nails” at the top edge on each of these card types. 4.4       Support Bay The support bay is a stand-alone cabinet that houses the power supplies for the Unit Under Test.  This bay also houses the test station power distribution unit and test station controller on earlier models. 4.5       Emergency Shutdown Switch The emergency shutdown switch is the large red button located at the lower left corner on the front of the testhead.  It turns off all AC power to the testhead, and is equivalent to turning off the m

Kelebihan dan Kekurangan Saluran Listrik Jenis Saluran Udara dan Saluran Bawah Tanah

Berdasarkan pemasangannya,   saluran distribusi dibagi menjadi dua kategori, yaitu : saluran udara (overhead line) merupakan sistem penyaluran tenaga listrik melalui kawat penghantar yang ditompang pada tiang listrik. Sedangkan saluran bawah tanah (underground cable) merupakan sistem penyaluran tenaga listrik melalui kabel-kabel yang ditanamkan di dalam tanah. 1.    Saluran Bawah Tanah (Underground Lines) Saluran distribusi yang menyalurkan energi listrik melalui kabel yang ditanam didalam tanah. Kategori saluran distribusi seperti ini adalah yang favorite untuk pemasangan di dalam kota, karena berada didalam tanah, maka tidak mengganggu keindahan kota dan juga tidak mudah terjadi gangguan akibat kondisi cuaca atau kondisi alam. Namun juga memilik kekurangan, yaitu mahalnya biaya investasi dan sulitnya menentukan titik gangguan dan perbaikannya. Kedua cara penyaluran memiliki keuntungan dan kerugian masing-masing. Keuntungan yang dapat diperoleh dari suatu jaringan bawah tanah adalah