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Industrial Automation Lab Experiments

Develop / test ladder program for pulse counting using limit switch/proximity sensor



Aim

Develop / test ladder program for pulse counting using limit switch/proximity sensor.

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.

Ladder diagram:

Explanation:

Observations:

Sr. no. Switch positions Up Counters (starts/stops) LED Status (ON/OFF)
1 SW ‘A’ pressed 10 times
2 SW ‘B’ pressed

Conclusion

  1. The PLC counters range from------------------------------------(C0 to C250/ C0 to C255).
  2. Maximum value of reset in PLC counters is------------------------------------

Viva Questions

  1. Develop a ladder diagram that will latch ON an output B 20 seconds after input A has been turned ON. After A is pushed, there will be a 10 second delay until A can have any effect again. After A has been pushed 3 times, B will be turned OFF.
  2. List applications of PLC counters.
  3. What the reset bit in PLC counter indicates?
  4. State the function of accumulator with reference to PLC counter.
  5. How Up Down counter works?
  6. State range of presser in PLC counter.