1. Programming PLCsProgramming PLCs
using LADDER Logicusing LADDER Logic

2. Presentation OutlinePresentation Outline
Review of Ladder ProgrammingReview of Ladder Programming
Keyence PLC Ladder BuilderKeyence PLC Ladder Builder
Example 1: Motor ControlExample 1: Motor Control
Example 2: Drill ControlExample 2: Drill Control
Example 3: Traffic LightExample 3: Traffic Light

3. Programming the PLCProgramming the PLC
Ladder Logic DiagramsLadder Logic Diagrams
Function Block DiagramsFunction Block Diagrams
Sequential Function ChartsSequential Function Charts
Instruction ListInstruction List
Structured TextStructured Text
High-Level LanguageHigh-Level Language

4. PLC Scan CyclePLC Scan Cycle
ReadRead
InputsInputs
ExecuteExecute
ProgramProgram
UpdateUpdate
OutputsOutputs

5. Ladder Logic ExecutionLadder Logic Execution
 Rungs of Ladder diagram are solved fromRungs of Ladder diagram are solved from
Left to right and top to bottomLeft to right and top to bottom
 Branches within rungs are solved top left toBranches within rungs are solved top left to
bottom rightbottom right
PP SS
RR
AA
BB
DD EE
FF GG HH
II JJ KK
Left Power RailLeft Power Rail
BranchBranch
Right Power RailRight Power Rail
Ladder RungLadder Rung

6. Basic LadderBasic Ladder
ProgrammingProgramming

7. Basic LadderBasic Ladder
ProgrammingProgramming

8. Basic LadderBasic Ladder
ProgrammingProgramming

9. Basic LadderBasic Ladder
ProgrammingProgramming
TimerTimer
OutputOutput
Input TriggeredInput Triggered
Timer SettingTimer Setting

10. Keyence Ladder BuilderKeyence Ladder Builder
 http://www.keyence.com/products/plc.htmlhttp://www.keyence.com/products/plc.html
-> PLC Library-> PLC Library
 Free evaluation version – up to 50 timesFree evaluation version – up to 50 times
 KV -> PLC Series from KeyenceKV -> PLC Series from Keyence

11. Keyence Ladder BuilderKeyence Ladder Builder
StartStart ->-> ProgramsPrograms ->-> Keyence ApplicationsKeyence Applications ->->
Ladder Builder for KV Sample Ver.Ladder Builder for KV Sample Ver.

12. Keyence Ladder BuilderKeyence Ladder Builder
Create a new file. Select the KV10Create a new file. Select the KV10
model.model.

13. Keyence Ladder BuilderKeyence Ladder Builder
ToolbarToolbar
LadderLadder
EditorEditor

14. Keyence Ladder BuilderKeyence Ladder Builder
Basic Table of I/OBasic Table of I/O
KV-10KV-10
InputInput
RelaysRelays
OutputOutput
RelaysRelays
InternalInternal
RelaysRelays
Timers/Timers/
CountersCounters
DataData
MemoryMemory
0000 –0000 –
00050005
0500 –0500 –
050305031000 –1000 –
19151915T/C 000 –T/C 000 –
063063
DM 0 –DM 0 –
0999

15. Example 1 – Motor ControlExample 1 – Motor Control
K1K1
~~
StartStart
StopStop
K1K1
~~
~~
~~
M1M1
K1K1
* The overload relay has been omitted in order to* The overload relay has been omitted in order to
simplify the circuitsimplify the circuit

16. Example 1 – Motor ControlExample 1 – Motor Control
 Stop -> Input Relay 0000 (X000)Stop -> Input Relay 0000 (X000)
Normally Closed (NC)Normally Closed (NC)
 Start -> Input Relay 0001 (X001)Start -> Input Relay 0001 (X001)
Normally Open (NO)Normally Open (NO)
 Motor -> Output Relay 0500 (Y050)Motor -> Output Relay 0500 (Y050)

17. Example 1 – Motor ControlExample 1 – Motor Control
ENDHENDH
ENDEND
Ladder Diagram:Ladder Diagram:
StartStart StopStop MotorMotor
MotorMotor

18. Example 1 – Motor ControlExample 1 – Motor Control
Add a normally open contactAdd a normally open contact
SelectSelect
relayrelay
00010001

19. Example 1 – Motor ControlExample 1 – Motor Control
Add a normally closed contactAdd a normally closed contact
SelectSelect
relayrelay
00000000

20. Example 1 – Motor ControlExample 1 – Motor Control
Add horizontal connection linesAdd horizontal connection lines

21. Example 1 – Motor ControlExample 1 – Motor Control
Add an output relayAdd an output relay
SelectSelect
relayrelay
05000500

22. Example 1 – Motor ControlExample 1 – Motor Control
Connect the circuit to the right power lineConnect the circuit to the right power line

23. Example 1 – Motor ControlExample 1 – Motor Control
Place the cursor below the contact of relay 0001Place the cursor below the contact of relay 0001
Add a Branch with a NO contact (OR logic)Add a Branch with a NO contact (OR logic)
SelectSelect
relayrelay
05000500

24. Example 1 – Motor ControlExample 1 – Motor Control
Place the cursor below the NO contact of relay 0500.Place the cursor below the NO contact of relay 0500.
TypeType ENDEND -> for end of routine . Click-> for end of routine . Click OKOK..

25. Example 1 – Motor ControlExample 1 – Motor Control
Place the cursor below on line 0004.Place the cursor below on line 0004.
TypeType ENDHENDH -> for end of program . Click-> for end of program . Click OKOK..

26. Example 1 – Motor ControlExample 1 – Motor Control
Run the simulatorRun the simulator

27. Example 1 – Motor ControlExample 1 – Motor Control
Execute the program for continuous scanExecute the program for continuous scan

28. Example 1 – Motor ControlExample 1 – Motor Control
Start the motorStart the motor
(turn on and then off the start button)(turn on and then off the start button)
Change the status here andChange the status here and
Then pressThen press Write Current ValueWrite Current Value……
……oror
doubledouble
click withclick with
the mousethe mouse
left buttonleft button

29. Example 1 – Motor ControlExample 1 – Motor Control
Stop the motorStop the motor
(watch the status of the motor – relay 0500)(watch the status of the motor – relay 0500)

30. Example 1 – Motor ControlExample 1 – Motor Control
Stop the simulation and return to the editorStop the simulation and return to the editor

31. Example 1 – Motor ControlExample 1 – Motor Control
Using labelsUsing labels

32. Example 1 – Motor ControlExample 1 – Motor Control
Right click with the mouse button on the deviceRight click with the mouse button on the device
and selectand select Change LabelChange Label

33. Example 1 – Motor ControlExample 1 – Motor Control
Type the label and press OK (or Enter)Type the label and press OK (or Enter)

34. Example 1 – Motor ControlExample 1 – Motor Control
Type all labels (save the program – optional)Type all labels (save the program – optional)
If you use labels you can enter the device by its labelIf you use labels you can enter the device by its label
(instead of its number)(instead of its number)

35. Example 2 – Drill ControlExample 2 – Drill Control
M1M1
M2M2
L1L1
L2L2
UpperUpper
Limit SwitchLimit Switch
LowerLower
Limit SwitchLimit Switch
Drill MotorDrill MotorVerticalVertical
MotorMotor
(up and down)(up and down)

36. Example 2 – Drill ControlExample 2 – Drill Control
 In the beginning of the drilling cycle the Upper LimitIn the beginning of the drilling cycle the Upper Limit
Switch (0001) is closedSwitch (0001) is closed
 The START button (0000) starts the drilling cycleThe START button (0000) starts the drilling cycle
 The drill motor M1 (0500) must start. At the sameThe drill motor M1 (0500) must start. At the same
time, the vertical motor M2 must start to descendtime, the vertical motor M2 must start to descend
the drill (0501)the drill (0501)
 The drill will stop at the Lower Limit Switch (0002).The drill will stop at the Lower Limit Switch (0002).
 At this time, the vertical motor start to ascend theAt this time, the vertical motor start to ascend the
drill (0502).drill (0502).
 The drill motor must stop just at the upper position.The drill motor must stop just at the upper position.
 Wait for a new drilling cycleWait for a new drilling cycle

37. Example 2 – Drill ControlExample 2 – Drill Control
Non-retentive contacts:Non-retentive contacts:

38. Example 2 – Drill ControlExample 2 – Drill Control
Go toGo to HelpHelp ->-> Instruction WordInstruction Word ->->
Instructions in Alphabetical OrderInstructions in Alphabetical Order ->-> DIFUDIFU

39. Example 2 – Drill ControlExample 2 – Drill Control
SET – RESET instructionsSET – RESET instructions

40. Example 2 – Drill ControlExample 2 – Drill Control
Go toGo to HelpHelp ->-> Instruction WordInstruction Word ->->
Instructions in Alphabetical OrderInstructions in Alphabetical Order ->-> SETSET
((RESRES))

41. Example 2 – Drill ControlExample 2 – Drill Control
Timing diagram:Timing diagram:
STARTSTART
LIMIT1LIMIT1
MOTORMOTOR
11
LIMIT2LIMIT2
M2-M2-
DOWNDOWN
M2-UPM2-UP

42. Example 2 – Drill ControlExample 2 – Drill Control

43. Example 3 – Traffic LightExample 3 – Traffic Light
 Start the operation with the switch S1Start the operation with the switch S1
(input 0000)(input 0000)
 The red signal must be ON for 5The red signal must be ON for 5
seconds (output 0500)seconds (output 0500)
 The green signal must be ON for 8The green signal must be ON for 8
seconds (output 0501)seconds (output 0501)
 The yellow signal must be ON for 3The yellow signal must be ON for 3
seconds (output 0502)seconds (output 0502)
 The cycle must continues until theThe cycle must continues until the
switchswitch
S1 is releasedS1 is released

44. Example 3 – Traffic LightExample 3 – Traffic Light
Go toGo to HelpHelp ->-> Instruction WordInstruction Word ->->
Instructions in Alphabetical OrderInstructions in Alphabetical Order ->-> TMRTMR

45. Example 3 – Traffic LightExample 3 – Traffic Light

46. Example 3 – Traffic LightExample 3 – Traffic Light
Place the cursor at the position you want toPlace the cursor at the position you want to
add a Timer. Then, double click with theadd a Timer. Then, double click with the
mouse left button and selectmouse left button and select InstructionInstruction ->->
TMRTMR

47. Example 3 – Traffic LightExample 3 – Traffic Light
Define the Timer number and the PresetDefine the Timer number and the Preset
value.value.
Timer numberTimer number
Preset valuePreset value

48. Example 3 – Traffic LightExample 3 – Traffic Light