Robotics and Automation · CHAPTER 4 / 5
Level: introductory undergraduate · Study session: 15–20 minutes including practice.
Learning outcome: Make transitions explicit instead of hiding them in nested conditions.
Before you begin: Complete earlier chapters in this discipline; revise algebra and units as needed.
1. Understand the idea
A finite-state machine names operating modes and the conditions for transitions. Outputs should be defined per state and exceptional conditions handled deliberately. Separate sensing, transition evaluation and actuator commands. Include reset behaviour, timeouts and sensor failure handling in a real implementation.
2. Write the model
Next state = f(current state, inputs)
Define the symbols from the worked case before substituting values. Keep units consistent, record the assumptions and round only after the calculation.
3. Follow a worked example
A teaching conveyor has Idle, Running and Fault states. Start moves Idle to Running; a detected jam moves Running to Fault; an authorised reset with the jam cleared returns Fault to Idle.
4. Explore the model
| Current state | Event | Next state |
|---|---|---|
| Idle | Start | Running |
| Running | Jam | Fault |
| Fault | Clear + reset | Idle |
Walk through Start, Jam, Start, Clear+Reset. In Fault, Start alone must not restart motion.
5. Reproduce it yourself
- Copy the input cases into Excel or a notebook and name each quantity and unit.
- Recalculate each result from the stated equation or rule. For qualitative cases, explain the state or partition decision instead.
- Change one input, predict the direction of change, then calculate again.
- Write one sentence explaining where the model stops being valid.
6. Check your understanding
Why should clearing a jam not automatically restart a machine?
Reveal the answer and check your work
Unexpected restart can expose people to motion; deliberate restart logic is needed.
Compare your result, units and reasoning. If they differ, return to the equation and test the worked case first.
7. Common mistake
This example is not a certified machine-safety design.
Further study and academic note
Explore the discipline reference and further learning resources. This is an original IIMEEE introductory teaching note with synthetic examples; it is not a peer-reviewed research result or a professional design specification. Figures were constructed from the listed teaching cases. Resource links support further study and do not imply endorsement.
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