Programmable Logic Controls training day 2
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PLC ladder logic training guide
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Programmable Logic Controls training day 2
- 1. ROLAND NIWAREEBA CERIANO MBIIKA EPHRAIM MALINGA
- 2. PLC Training Day 2 Ladder Programming
- 3. Basics • Observe the diagram below
- 4. Other Symbols in Logic Diagrams Normally Open /Closed Contact Normally Open/ Closed Coil Timers
- 5. Normally Open/ Closed Contact
- 6. Normally Open/ Closed Coil
- 7. Basic AND & OR Gates AND Gate OR Gate
- 10. Ladder Diagrams
- 11. Outputs and Latches • These can be used as conditions for other actions • For instance, an output can actuate another sequence of events
- 12. Example
- 13. Example
- 14. Exercise Write a PLC program to implement the conditional logic statements (a), (b) and (c) below. a) A PLC output is to switch on if any of three inputs is switched on. b) A PLC output is to switch on if any one of three inputs is switched on but not two or more. c) A PLC output is to switch on if any two outputs are switched on, but not the third.
- 15. Exercise
- 16. Exercise
- 17. Implementing Latching • What does the term Latching mean ?
- 18. Timers • Timers are used to implement timing functionality in PLCs. • Most basic use is to introduce delays between processes
- 19. Timers
- 20. Pulse Generator
- 21. Pulse Generator
- 22. Pulse Generator
- 23. Counters
Editor's Notes
- The logic of the rung above is such:• If Input1 is ON (or true) - power (logic) completes the circuit from the left rail to the right rail - and Output1 turns ON (or true). • If Input1 is OFF (or false) - then the circuit is not completed and logic does not flow to the right - and Output 1 is OFF (or false).
- Lets Examine these slides together
- Various inputs can be organised together to give a set output. This is usually termed as conditional logic. Consider the diagram shown and lets examine the logic behind it
- Lets connect the circuit to a PLC as shown in the diagram above. Lets consider the implementation of that circuit in a PLC programming interface.
- Can we build this ladder diagram....Demonstrate the normally closed contact
- Lets take time to understand these exercises.
- For example, when a start push button is pressed, the pneumatic cylinder shown in extends, remains extended for 5 seconds and then returns. Draw the PLC wiring diagram and the appropriate ladder logic.
- Two counters can be combined to make a pulse generator. This is best illustrated by an example.
- When the Start button in Fig 2.24 is pressed the cylinder in Fig 2.23 oscillates,extending for 2 s and returning for 1 s until the Stop button is pressed.