Chapter 2 ladder
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Ladder diagrams are a type of graphic language used to represent logic systems for industrial control. They resemble a ladder, with two vertical power rails and circuits connected horizontally in rungs. Standard symbols are used to represent components like switches, relays, and outputs. Logic functions like AND, OR, and NOT can be depicted using these symbols. Ladder diagrams are used to program PLCs and show control circuits for machines, depicting inputs, logic functions, and outputs.
![Ladder Diagram ,[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Chapter 2 ladder
- 1. Chapter 2 FUNDAMENTALS OF PLC PROGRAMMING Industrial Electronics DEK 3113
- 7. Normally Open Schematics (NO)-Input Schematics
- 8. Normally Closed Schematics (NC)-Input Schematics
- 12. Logic Function…cont - AND
- 16. Logic Function…cont - NOR
- 18. Logic Function…cont - NAND
- 19. Logic Function…cont - NOT
- 21. Combination of AND , OR , and inverter (NOT) gates
- 23. Vibrating/Jog circuit -When, PB is pressed, output IR is activated. -But after several microsecond, the normally closed IR is open then will stop the output IR. -This applicable to move an object which need to locate at precise location.
- 25. Control circuit has Overload Protection Device
- 26. Control circuit in ladder diagram. -When PB is pushed(forward/reverse),motor will move according to the command. -But, when there is an overcurrent,CB will stop the current flow by blow the fuse. -Means, NC of CB will open and stop the current flow to the circuit. -The circuit can be recovered by change the fuse. -If there is thermal overload, TOR will cut the current flow. -Lamp,L3 will turn on and TOR need to be reset.
- 27. Two wire control -only has one contact for switching device either ON or OFF state. -When ON state, M will energize and activate three phase motor. -Heater will heat if there is over current and open the circuit.
- 28. Three wire control -the connection almost the same as two wire circuit except has an extra set of contact connected in parallel as the pilot switch. -this extra contact provide extra third wire. -this auxiliary contact keep coil M energize even after start push button release.
- 30. Thank You & Have A Nice Day