BASIC COMPONENTS OF PLC NEW.ppt
- 47. NC & NO
- 48. NC & NO
- 58. A discrete input also referred as digital input is an input that is either ON or OFF are connected to the PLC digital input. In the ON condition it is referred to as logic 1 or a logic high and in the OFF condition maybe referred to as logic o or logic low. Discrete Input Normally Open Pushbutton Normally Closed Pushbutton Normally Open switch Normally Closed switch Normally Open contact Normally closed contact
- 59. Classification of PLC Input and Output Modules
- 60. 1. Digital I/O Module • The digital module is also called Discrete Module. • It is useful in the ON or OFF condition. • Based on Input and Output, the digital module is of two types. 1. Digital Input Module • Examples: Push switch, Toggle switch, Rocker switch, Selector switch, Proximity switch, Limit switch and etc are the example of the Digital Input Signal. 2. Digital Output Module • Examples: Lamp, Coil, Buzzer, Relay, Motor, Fan, Heater, Actuator, Solenoid Valve and etc are the example of the Digital Output Signal.
- 61. 2. Analog I/O Module • The analog module is called a Continuous Module. • Usually, the voltage or current is given to the input module in the form of an analog signal. • Analog I/O modules are also of two types. 1.Analog Input Module • Examples: Temperature detection switch, Pressure detection switch, Flow detection switch, Level detection switch, Limit detection switch, Position detection switch, PH Level detection switch are the best example of the Analog Input Signal. 2.Analog Output Module • Examples: Temperature Transmitter, Thermocouples, Pressure Transmitter, Flow Transmitter, Level Transmitter, etc., are the example of the Analog Output Signal.
- 65. PLC Programming
- 67. PLC Programming • STL - Structured Text / Statement List • LAD - Ladder Diagram • FBD - Function Block Diagram • SFC - Sequential Function Chart
- 70. Rails
- 71. RUNG
- 72. Inputs & Outputs
- 74. Basic Important Parts of Ladder Diagram in PLC Programming • Rungs • Branches • Inputs and Outputs for PLC programming • Addressing Inputs and Outputs • Instructions
- 75. Rungs & Rails • In Ladder diagram, the horizontal lines called Rungs. You can put as many numbers of rungs as per your project requirements. • The vertical lines show the power supply or flow.
- 76. 1. Series Branch: • In the series branch, inputs or outputs are connected in the series.
- 77. 2. Parallel Branch: • In the parallel branch, inputs or outputs are connected parallelly.
- 78. 3. Nest Branch: • The combination of series and parallel branches in the same or different rungs are called as Nest Branch.
- 79. Inputs and Outputs for PLC Programming: • Inputs refer to the switch or Push Button (PB). • Output referred to the Coil or Lamp or Load. • Input modules are represented by the ‘I‘ or ‘X‘ and • Output modules are presented by the ‘Q‘ or ‘Y‘. • For the Ladder Diagram (LD) programming language, normally open and normally closed contact is used in the form of input.
- 80. Input and output in PLC LD programming,
- 81. Addressing Inputs and Outputs ABB PLC • Input Address: I0, I1, I2,…………, In. • Output Address: Q0, Q1, Q2, Q3, ………….., Qn. Siemens PLC • Input Address: I0.0, I0.1, I0.2, I0.3,……. I0.7. • Output Address: Q0.0, Q0.1, Q0.2, Q0.3,……. Q0.7. AB PLC • Input Address: I:0.0/0, I:0.0/1, I:0.0/2, I:0.0/3, ……….., I:0.0/7. • Output Address: O:0.0/0, O:0.0/1, O:0.0/2, O:0.0/3, ……., O:0.0/7. Delta PLC & Mitsubishi PLC • Input Address: X0, X1, X2, X3……….., Xn. • Output Address: Y0, Y1, Y2, Y3, ……….., Yn.
- 87. 87 INPUT MODULE WIRING DIAGRAM LADDER PROGRAM I:0.1 0 I= Input Module slot # in rack Module Terminal # Siemens S7-1200 Address I:0.1
- 88. N. O C L2 L1 L2 OUTPUT MODULE WIRING MOTOR CONTACTOR Q:0.1 0 CONTACTOR LADDER PROGRAM L1 L2 FIELD WIRING •SOLENOID •VALVES •LAMP •BUZZER L1
- 89. Advantage of the Ladder Diagram PLC Language • The ladder diagram (LD) is a simple logic construction and more reliable than an electronic circuit controller. • Easy to learn and read the program. • Every programming symbol performs specific actions. • LD having good representation for discrete logic. • Easy to troubleshoot. • Shut down the power without the switch (i.e. hardware devices).
- 91. 1. Inputs can be used in Series as well as Parallel to form a connection
- 92. 2. Outputs (or coil) can be used only in Parallel
- 93. 3. One Input can be used in multiple times in one program Single Input with a different form of Outputs
- 94. 4. One Output cannot be used multiple times in one program, except in Set/Reset and Latch/ Unlatch functions • In the function set/reset, the same output address is used. And it can be connected to the same or different inputs. • Different inputs (I1 and I2) are linked with the single output (Q1) using the set and reset function. • When the Input (I1) is pressed, the output coil will be set ( i.e. Q1 on activate mode). And when the input (I2) is pressed, the output coil will be reset ( i.e. Q1 on deactivate mode).
- 95. • In latch/unlatch function, working is the same as set/reset function. The only difference is, the first input (I1) is normally opened (NO) and the second input (I2) is normally closed (NC). • The latch/unlatch function is useful for the cycling process.
- 96. 5. Input Address cannot be used as an Output Address • The same input address can be used as multiple inputs. And it can not be used as output.
- 97. 6. Outputs Address can be used as Inputs Address
- 113. AND LOGIC GATE & PLC LADDER DIAGRAM
- 114. OR LOGIC GATE & PLC LADDER DIAGRAM
- 115. NAND LOGIC GATE & PLC LADDER DIAGRAM
- 116. NOR LOGIC GATE & PLC LADDER DIAGRAM
- 117. XOR LOGIC GATE & PLC LADDER DIAGRAM