Basic overview of Programmable Logic Controller(PLC),HMI,SCADA
- 1. Programmable Logic Controller MADE BY: ASIF ADNAN RASHID
- 2. What is PLC(Programmable Logic Controller) PLC may be defined as micro-controller based controlling device that used to store instructions in programmable memory to implement logic, sequencing, timing, counting and arithmetic function through digital/analog input/output modules for controlling device or process. Why PLC is used over microcontroller?: I. PLC has more input/output than microcontroller. We can also extend input and output module in PLC. II. PLC processing capacity is lot more higher and faster than microcontroller. III. We can change PLC module or restore data if it is problematic. IV. PLC can work on high voltage but microcontroller faces some discrepancies while operating in high voltage. V. PLC has display unit and observe the current condition, but in microcontroller we can use display as an add-in service.
- 3. Components of PLC PLC consists of the following units: 1)Processor 2)I/O unit 3)Memory unit 4)Power Supply 5)Programming Unit
- 4. PLC Operating Cycle PLC automate a process by I. Read Input II. Program Scan III. Energize the Output IV. Continue the cycle PLC can be divided into 3 parts: I. CPU II. Input/Output III. Programming Device When box reaches at the end of the conveyor, sensor send a signal to PLC to stop the motor as well as stop the conveyor.
- 5. PLC INPUT and OUTPUT Module
- 6. Signal of Input and Output Module
- 7. SIEMENS PLC
- 13. Peripheral devices of PLC Input Devices: 1. Limit Switches 2. Proximity Sensors 3. Sensors 4. Relay 5. Solenoid 6. Photoelectric sensors Output Devices: 1. Actuators 2. Lamps 3. Valves 4. Motors etc Different Brand PLC
- 14. PLC Programming Language International Standards for PLC specifies Three graphical and Two text-based languages for programming PLC. Language Abbreviation Type Application best suited for Ladder Logic Diagram LD Graphical Discrete Control Function Block Diagram FBD Graphical Continuous Control Sequential Function Chart SFC Graphical Sequencing Instruction List IL Textural Similar to Ladder Logic Structured Text ST Textural Complex Logic , Computational etc
- 16. Motor Connection Motor that is run by PLC is controlled in 2 ways. 1)Power Ckt (AC current) 2) Control Ckt (PLC )
- 17. PLC Ladder Diagram To On/Off a motor it should follow the undermentioned ladder diagram with latching:
- 19. HMI Function
- 20. HMI setup procedure Steps -Browse PLC -Continue up to finish(Untick select item) -Take start, stop, load -Set properties of elements, object -Match with PLC tag table -Simulation -Download HMI
- 22. HMI…. Add memory block in program main block
- 23. HMI….
- 25. HMI setup procedure…. Press Start – Stop Switch
- 26. HMI Download Press Right Button On HMI Download Hardware and Software Finish and check HMI screen
- 27. What is SCADA?
- 28. Advantages
- 29. Traffic Control with 2 roads
- 30. Ladder Diagram for Traffic Control for 2 roads
- 31. SCADA SIMULATION FOR TRAFFIC SIGNAL
- 32. THANK YOU FOR YOUR ATTENTION