Develop/ test ladder program to blink LED/lamp.

Aim:

Develop/ test ladder program to blink LED/lamp.

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:

1. ON time of LED is seconds and OFF time of LED is seconds.

Conclusions:

1. On-delay timer counts time based intervals when the rung condition is-------------------(true/false).
2. Off-delay timer counts time based intervals when the rung condition is-------------------(true/false).

Questions:

1. Draw ladder diagram to make LED ON after 15 seconds when switch is pressed.
2. What is the preset bit in PLC timer indicate?
3. State the meaning of ON delay timer and OFF delay timer in PLC.
4. State the range of preset in PLC timer.
5. State function of accumulator with reference to PLC timer.
6. How the retentive PLC timer works?