Logic to Ladder Diagram


There are some methods to do PLC programming. The programming methods can be with Logic Ladder Diagram, mneumonic (statement list), and / or function block diagram.

One of the PLC programming methods that are very commonly used programming using PLC ladder diagram. The method is practical and easy to understand. The programmer in charge of writing a program should describe an electronic switch circuit. It can be designed to perform the conversion of electronic circuits that already exist, then replace the switch function according to the functions available to software programmers.

A ladder diagram consists of a downward line on the left side with lines branching to the right. Existing line on the left side is called the bus bar, whereas the branching lines are lines of instructions or steps. Instructions are placed along the line of a variety of conditions linked to the other instructions on the right side. Logic combination of the conditions stated when and how the existing instructions on the right side is done.

Example of ladder diagram
Figure 1. Example of ladder diagram


As shown in Figure 1 is, along the lines of instructions can branch out again and then joined again. The lines of vertical pairs (such as capacitors symbol) is called the condition. The pair of vertical lines no diagonal line called the Normal Open - Normally Open or NO and related instruction LOAD (LD), AND or OR. While the couple have a vertical line was a diagonal line called the Normal Closed - Normally Close or NC, and related instructions LD NOT, AND NOT or OR NOT.

PLC is still used mostly as a strand of logic, as generally in strings of logic / digital solutions to these problems will be easier if each input and output components are presented in digital logic, involving the truth table, set the output equation in the table are based on binary numbers, then simplify the equation by using Karnaugh Map.

Here are some examples of conversion from basic logic gates in the Ladder Diagram. (Example given has 2 inputs and 1 output).


Logic AND
The truth table of logic AND is as follows,
Logic Diagram AND Conversion to Ladder Diagram,
Ladder Diagram AND

Logic OR
The truth table of logic OR is as follows,
Logic Diagram OR Conversion to Ladder Diagram,
Ladder Diagram OR

Logic NOT
The truth table of logic NOT is as follows,
Logic Diagram NOT Conversion to Ladder Diagram,
Ladder Diagram NOT

Logic NAND
Logic NAND is a development of logic AND, OR and NOT. The truth table is as follows,
Logic Diagram NAND The truth table above have the following equation,
O = (A.B) '= A' + B '
So the conversion to Ladder Diagram,
Ladder Diagram NAND

Logic NOR
This logic is also the development of the logic AND, OR and NOT. The truth table is as follows,
Logic Diagram NOR The truth table above have the following equation,
O = (A + B) '= A'. B '
So the conversion to Ladder Diagram,
Ladder Diagram NOR

Logic XOR
Similarly, the logic of the previous ones. This logic is also the development of AND, OR and NOT. This logic is widely used in summing strand (adder). The truth table is as follows,
Logic Diagram XOR The truth table above have the following equation,
O = A o B = A '. B + A. B'
So the conversion to Ladder Diagram,
Ladder Diagram XOR

Hopefully this article can add your insights.
Please follow me:

ShareTo
Share on Facebook Tweet this Share to Google Plus Stumble this article
CLOSE

Enter Your Email Address




All Labels

  1. ABB PLC
  2. Allen Bradley PLC
  3. Analog Input
  4. Android
  5. Android and PLC
  6. Android Bluetooth
  7. Automatic Gates using PLC
  8. Baldor PLC
  9. Battery Level Indicator using PLC Analog
  10. BMS
  11. Building Management System
  12. Car Ticketing Machine using PLC
  13. CIMON PLC
  14. Click Series PLC
  15. Computer Vision
  16. Computer Vision and PLC
  17. Control Seven Segment Display with PLC
  18. Conveyor Control Using PLC
  19. CPU PLC
  20. CV and PLC
  21. CX-One
  22. DCS
  23. DDC
  24. DELMIA V5
  25. DeltaV
  26. Digital Input
  27. DirectLogic PLC
  28. DirectSOFT PLC
  29. Eaton PLC
  30. Elevator with PLC Program
  31. EPICS PLC
  32. Fatek PLC
  33. Festo PLC
  34. Fieldbus
  35. Forex Trading and PLC
  36. FPGA PLC
  37. GE Fanuc PLC
  38. GP proface
  39. GX Developer
  40. Heater Controller with PLC
  41. Hitachi PLC
  42. HMI
  43. Honeywell PLC
  44. IDEC PLC
  45. Keyence PLC
  46. Koyo PLC
  47. LG PLC
  48. Lock Unlock Door Using PLC
  49. Logixpro PLC
  50. Maple OIT
  51. Matsushita PLC
  52. MELSEC A
  53. MELSEC Q
  54. Memory PLC
  55. Micro PLC
  56. MicroSmart PLC
  57. Mitsubishi PLC
  58. Mobile Application
  59. Modbus
  60. Modicon PLC
  61. Momentum PLC
  62. Motion Control
  63. National Instruments PLC
  64. Omron PLC
  65. OPC
  66. PAC
  67. Panasonic PLC
  68. Parking Information using PLC
  69. Password Using PLC
  70. PLC
  71. PLC and CNC
  72. PLC and Computer
  73. PLC and Facebook
  74. PLC and PC
  75. PLC and Servo
  76. PLC Battery
  77. PLC Beginner Guide
  78. PLC Book
  79. PLC Cable
  80. PLC Codesys
  81. PLC Companies List
  82. PLC Computers
  83. PLC Design
  84. PLC for 3 Movement
  85. PLC for Assembly Line
  86. PLC for Automatic Welding
  87. PLC for Binding Machine
  88. PLC for Cutting Machine
  89. PLC for Filling Machine
  90. PLC for Fountain Application
  91. PLC for Injection Molding
  92. PLC for Marking
  93. PLC for Packing
  94. PLC for Rotary Bottle Washing
  95. PLC for Snack Vending Machine
  96. PLC for Sorter Machine
  97. PLC for Water Treatment
  98. PLC Hardware
  99. PLC Hybrid
  100. PLC Information
  101. PLC Knowledge
  102. PLC Language
  103. PLC Link Model
  104. PLC Mitsubishi Download
  105. PLC Model
  106. PLC Modules
  107. PLC Simulator
  108. PLC Software
  109. PLC Supplier
  110. PLC Types
  111. PLC Wiring
  112. PLC WorkShop
  113. PLC-ANALYZER
  114. PLCSIM
  115. Power Supply for PLC
  116. Profibus
  117. ProSafe PLC
  118. Push ON Push OFF with PLC
  119. Quickpanel Operator Interfaces
  120. RTU
  121. RTU and PLC
  122. SAS
  123. SCADA
  124. Schneider PLC
  125. SHARP PLC
  126. Siemens PLC
  127. SINUMERIK CNC
  128. Small Modular PLC
  129. Standard Sequence Programming for PLC
  130. Substation Automation System
  131. Teco PLC
  132. Telemetry
  133. TEP PLC
  134. Texas Instruments PLC
  135. Timer Countdown with PLC
  136. Toshiba PLC
  137. Touch Screen PLC
  138. Traffic Light with PLC
  139. TWIDO PLC
  140. Types of PLC
  141. Unitary PLC
  142. Unitronics PLC
  143. VIPA PLC
  144. Vision PLC
  145. Weighing Machine Using PLC
  146. Yokogawa PLC
  147. Zelio PLC

Search This Blog

Loading...
Copyright © 2009- All Rights Reserved