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Home Engineering Mechanics Industrial Automation Develop/ test ladder program for sequential control application of lamps/ DC motors
Industrial Automation Lab Experiments

Develop/ test ladder program for sequential control application of lamps/ DC motors



Aim:

Develop/ test ladder program for sequential control application of lamps/ DC motors.

Apparatus Required:

PLC software, NO and NC switches.

Procedure:-

  1. Load the RS Logix software to the PC.
  2. Open the RS Logix software.
  3. Switch On the PLC trainer.
  4. Open the New project and draw the ladder logic program.
  5. Compile the program.
  6. Run the Program.
  7. Give force and observe the output.

Concept structure: Sequential ON-OFF of lamps:

It is specific way of On-Off control of the lamps. Two lamps need to be controlled sequentially one after another. Two pushbutton switches and two lamps are required for this control. When Start button is pressed, lamp 1 will glow and after 10 seconds lamp 2 glows and lamp 1 will become off. One on delay timer (Ton) is used for generating a delay.

Ladder diagram:

Explanation:

Observations:

Readings for timer bits

Timer address
Time base
Preset
Accumulator

Conclusions:

  1. The processes that demand certain operations to be performed in a specific order need-------------------control (sequential/combination/automatic).
  2. If lamp 2 glows after turning ON lamp 1, then the type of control process involved is-------------------(sequential/combination/automatic).

Viva Questions

  1. Draw logic symbols for PLC timers.
  2. List two applications of timer.
  3. Explain timer instruction of PLC.
  4. State the PLC timer that needs reset instruction.
  5. What are numerical limits for typical 16-bit timers?
  6. Give applications of retentive timer.