Uploaded August 2026 | Updated September 2026, 3 weeks ago
PLC Step 2: define the I/O. The full conveyor map — X1 Start, X2 Stop (NC), X3 left sensor, X4 right sensor, Y1 motor run, Y2 direction. Four inputs, two outputs.
⚡ QUICK ANSWER
Step 2 of PLC program development is defining the I/O — listing every input and output with its address and description before you write any logic. For this conveyor, the complete map is: X1 is Start, X2 is Stop (wired normally closed), X3 is the left sensor, and X4 is the right sensor. On the output side, Y1 is Motor Run and Y2 is Direction. That's four inputs and two outputs, with no analog I/O needed for this application — everything is simple on/off discrete signals. Notice how the two outputs split the job: Y1 decides whether the motor runs at all, and Y2 decides which way it turns, which is what makes the automatic reverse possible. Also worth noting is that X2, the stop button, is normally closed — the standard, safe wiring practice for a stop, so a broken wire stops the machine rather than leaving it running. In the simulator, the I/O map is already defined by the conveyor scene, so you can go straight to programming. The full conveyor build is in the guide below.
🎮 TRY IT FREE — BUILD THIS CONVEYOR IN THE ACC PLC SIMULATOR
3D scenes, no install, right in your browser: accautomation.ca/simulator
▶ WATCH THE FULL TUTORIAL
PLC Programming Tutorial: Build a Conveyor System: youtu.be/himbbHHZ6HM
📖 FULL STEP-BY-STEP + DOWNLOADS (the complete conveyor build)
accautomation.ca/plc-programming-tutorial-build-a-conveyor-system-acc-simulator
📚 WHAT YOU'LL LEARN
✅ Why you list every input and output with its address before programming
✅ The full conveyor I/O map: X1 Start, X2 Stop (NC), X3 left sensor, X4 right sensor
✅ How the outputs split the job: Y1 motor run, Y2 direction
✅ Why the stop button is wired normally closed
✅ Why no analog I/O is needed for this application
❓ FREQUENTLY ASKED
Q: What is the I/O list for the conveyor program?
A: Four inputs and two outputs — X1 Start, X2 Stop (normally closed), X3 left sensor, X4 right sensor, Y1 motor run, and Y2 direction. No analog I/O is needed. The full build is in the guide.
Q: Why is the stop button wired normally closed?
A: It's the standard safe practice — with a normally closed stop, a broken wire or lost connection stops the machine instead of leaving it running, so the circuit fails to a safe state.
👉 Full conveyor build: accautomation.ca/plc-programming-tutorial-build-a-conveyor-system-acc-simulator
🔗 MORE RESOURCES
🎮 Free ACC PLC Simulator (3D scenes, no install): accautomation.ca/simulator
▶ Step 1 — Define the Task: youtube.com/shorts/Oy310Nk3BNk
▶ Step 5 — Test the Program: youtube.com/shorts/slW0svgah9A
▶ PLC Beginners Guide: accautomation.ca/programming/plc-beginners-guide
▶ All Series: accautomation.ca/series
▶ Free eBooks: accautomation.ca (subscribe for download)
🛒 RECOMMENDED HARDWARE
▶ Shop: automationdirect.com
▶ Parts Guide: accautomation.ca/purchase-find-parts
💬 Questions? Drop a comment below.
🔔 New tutorials every Monday — Subscribe and hit the bell!
#PLC #LadderLogic #IndustrialAutomation #PLCProgramming #ACCAutomation #PLCBasics #LearnPLC #Conveyor #PLCSimulator #Shorts
Regards,
Garry
ACC Automation
accautomation.ca
PLC Step 2: define the I/O. The full conveyor map — X1 Start, X2 Stop (NC), X3 left sensor, X4 right sensor, Y1 motor run, Y2 direction. Four inputs, two outputs.
⚡ QUICK ANSWER
Step 2 of PLC program development is defining the I/O — listing every input and output with its address and description before you write any logic. For this conveyor, the complete map is: X1 is Start, X2 is Stop (wired normally closed), X3 is the left sensor, and X4 is the right sensor. On the output side, Y1 is Motor Run and Y2 is Direction. That's four inputs and two outputs, with no analog I/O needed for this application — everything is simple on/off discrete signals. Notice how the two outputs split the job: Y1 decides whether the motor runs at all, and Y2 decides which way it turns, which is what makes the automatic reverse possible. Also worth noting is that X2, the stop button, is normally closed — the standard, safe wiring practice for a stop, so a broken wire stops the machine rather than leaving it running. In the simulator, the I/O map is already defined by the conveyor scene, so you can go straight to programming. The full conveyor build is in the guide below.
🎮 TRY IT FREE — BUILD THIS CONVEYOR IN THE ACC PLC SIMULATOR
3D scenes, no install, right in your browser: accautomation.ca/simulator
▶ WATCH THE FULL TUTORIAL
PLC Programming Tutorial: Build a Conveyor System: youtu.be/himbbHHZ6HM
📖 FULL STEP-BY-STEP + DOWNLOADS (the complete conveyor build)
accautomation.ca/plc-programming-tutorial-build-a-conveyor-system-acc-simulator
📚 WHAT YOU'LL LEARN
✅ Why you list every input and output with its address before programming
✅ The full conveyor I/O map: X1 Start, X2 Stop (NC), X3 left sensor, X4 right sensor
✅ How the outputs split the job: Y1 motor run, Y2 direction
✅ Why the stop button is wired normally closed
✅ Why no analog I/O is needed for this application
❓ FREQUENTLY ASKED
Q: What is the I/O list for the conveyor program?
A: Four inputs and two outputs — X1 Start, X2 Stop (normally closed), X3 left sensor, X4 right sensor, Y1 motor run, and Y2 direction. No analog I/O is needed. The full build is in the guide.
Q: Why is the stop button wired normally closed?
A: It's the standard safe practice — with a normally closed stop, a broken wire or lost connection stops the machine instead of leaving it running, so the circuit fails to a safe state.
👉 Full conveyor build: accautomation.ca/plc-programming-tutorial-build-a-conveyor-system-acc-simulator
🔗 MORE RESOURCES
🎮 Free ACC PLC Simulator (3D scenes, no install): accautomation.ca/simulator
▶ Step 1 — Define the Task: youtube.com/shorts/Oy310Nk3BNk
▶ Step 5 — Test the Program: youtube.com/shorts/slW0svgah9A
▶ PLC Beginners Guide: accautomation.ca/programming/plc-beginners-guide
▶ All Series: accautomation.ca/series
▶ Free eBooks: accautomation.ca (subscribe for download)
🛒 RECOMMENDED HARDWARE
▶ Shop: automationdirect.com
▶ Parts Guide: accautomation.ca/purchase-find-parts
💬 Questions? Drop a comment below.
🔔 New tutorials every Monday — Subscribe and hit the bell!
#PLC #LadderLogic #IndustrialAutomation #PLCProgramming #ACCAutomation #PLCBasics #LearnPLC #Conveyor #PLCSimulator #Shorts
Regards,
Garry
ACC Automation
accautomation.ca










