I/O Fundamentals

Inputs, outputs, digital, analog, sourcing, sinking this is how a PLC actually connects to the real world. Master this and you can wire a sensor, read a transmitter, and trace a signal from the field device to the PLC address.
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What You'll Learn

⚡️

Distinguish inputs from outputs

Identify real-world examples of each on any automated machine and instantly know where a signal is coming from and where it's going.


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Explain digital vs. analog I/O

Know when a discrete on/off signal is the right call and when you need a continuous analog signal and what happens if you mix them up.

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Interpret sourcing vs. sinking wiring

The #1 thing that trips up beginners. Wire it wrong and the PLC never sees the sensor. Wire it right and it just works. This ends the confusion for good.

🛡️

Perform analog scaling

Convert the raw integer the analog card spits out into a pressure temperature, or flow value a technician can actually use.

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Identify sensor types and when to use them

Proximity, photoelectric, limit switches, pressure transmitters what each one does and how to pick the right one for the application.

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Understand I/O addressing

Map physical field wires to PLC tag addresses across Allen-Bradley, Siemens, and Codesys naming conventions. All different, same concept.

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Troubleshoot I/O problems

Systematically diagnose why a sensor isn't being read, why an output isn't firing, and how to confirm your fix before you close the panel.

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Read an I/O wiring diagram

Trace a signal from field device to I/O card terminal, and spot the moment the wiring diagram doesn't match what's actually in the panel.

Who This Is For

Technicians

You're already working on machines but want to understand the hardware well enough to troubleshoot faster without calling an engineer every time.

Early-Career Engineers

You can write code but the panel hardware is still fuzzy. This fills in the physical layer — the stuff between the PLC and the motor.

Career Changers

Coming from electrical, mechanical, or IT? This module gives you the controls-specific hardware context that textbooks gloss over.

Course Lessons

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