PLCTrain Hands-on maintenance training

Photoeye troubleshooting practice for conveyor sensor and input faults

Photoeye troubleshooting.
Clear belt. Blocked input. What changed?

Actual Conveyor Rescue gameplay24-second preview
Watch without an account. Male AI coach narration with captions. Use full-screen to read the PLC tags. Open the video walkthrough.
Read what happens in the video
  1. The box won't move. Where would you look first?
  2. Compare the sensor signal with the ladder logic.
  3. Adjust the virtual sensor. Stopped does not mean safe.
  4. Should it run or stop?
  5. Now test your fix. Watch the conveyor and logic respond together. Finish every check in the free trial.

This is an excerpt from the real simulation, recorded with a local test account. It does not show a completed assessment. Full verification continues in the trial. Practice maintenance is not real LOTO.

Separate the beam from what the program reports. PLCTrain offers photoeye troubleshooting practice in a browser-based conveyor simulator, without physical equipment. Compare the receiving space, simulated sensor input, PLC tag mapping, and ladder condition. Find where the evidence disagrees, then test a supported correction.

  • Three conveyor fault investigations
  • Live PLC signals and moving sensors
  • Optional coaching and saved progress
Start the free Conveyor Rescue demoSee an example skills report

No card. No equipment. Confirm your email and sign in to play. Watching this recording does not open the trial.

3 connected conveyor zones

3 fault investigations

Your pace hints, replay, and saved progress

For maintenance managers and trainers

More useful than
a completion badge.

Could they follow the evidence? Did they need help? Did they prove the repair? Those are the questions that make a practice session useful for coaching.

ILLUSTRATIVE SAMPLE / NOT LIVE LEARNER DATA

Troubleshooting practice review

Example learner A Conveyor Rescue

Example data only.
Not a qualification or work authorization.

Example evidence and coaching decisions
SkillWhat the practice record showsCoaching decision
Gather evidenceCompared the receiving station, photoeye input, and motor command before adjusting the sensor.Demonstrated in practice
Trace the PLC signalNeeded a coaching prompt to distinguish the physical input from the tag used by the program.Practice next
Manage temporary forcesRemoved the temporary force and disabled forcing before attempting final verification.Demonstrated in practice
Verify the repairChecked clear and occupied receiving conditions and completed the box transfer.Demonstrated in practice

The next useful conversation

Can you trace the input without a hint?

Ask the learner to explain which physical sensor drives the PLC tag, then repeat an input-mapping exercise with a different fault. A correct repair with help is a starting point for coaching, not proof of independent skill.

Coaching prompts
1 example
Unnecessary component changes
1 example
What is available today? The trial includes individual practice records. This is a sample manager-report layout with made-up data, not an available live team dashboard or a result from the video above.

Try the investigation yourself. See which decisions you would want your team to explain.

Try it as a manager

Free guides / No account needed to read

Make the signals make sense.

The belt is clear. Why does the photoeye say blocked?Understand a blocked photoeye input on a clear conveyor. Compare the sensor, physical input, PLC tag, and ladder logic using PLCTrain simulation examples.XIC vs XIO. Read the bit, not the name.Learn when XIC and XIO instructions are true, why green does not mean a sensor is healthy, and how a blocked photoeye affects a conveyor rung.Run command: ON. Conveyor: STOPPED. Both can be true.Understand the difference between a PLC run command, output command, and actual conveyor motion. Learn to explain why a requested start may not move a belt.

Explore PLC troubleshooting training, Industrial PLC training. Browse the free PLC troubleshooting guides

What is PLCTrain?

Practice finding the first photoeye signal mismatch.

A reported blocked input does not prove that a box occupies the receiving station. In Conveyor Rescue, a sensor adjustment, an incorrect input mapping, or a logic condition can produce the same stopped-belt complaint. Compare the virtual space and physical input before following the named tag into the rung. A temporary force can also conceal what the sensor reports. The linked photoeye guide explains these layers in detail; this practice page helps you decide what to investigate in the simulator.

Inside the free trial / Sign-in required

"The box will not feed."

Your callout
Operator report
"There is a box waiting on belt 1. The section ahead looks empty, but it will not move on. Can you take a look?"

Where would you look first?

The space ahead. The photoeye. The PLC input and rung. The motor output.

Choose your own starting point. Compare the machine with the signals, try a likely cause, and test what changed. A wrong lead is recoverable.

Moving once is not enough. Prove that the line feeds when clear and stops when the receiving station is full.

One complete investigation. Coach off until you ask.Training simulation only
01 / 03

Trace the photoeye signal through four layers.

  1. Compare the space and sensor.

    Check whether the modeled receiving station is clear or occupied and compare that with the photoeye input. Investigate the virtual beam and alignment when those two observations disagree.

  2. Compare the input and program tag.

    Follow the input mapping into the named photoeye tag. An apparently useful tag name can still read a different input, and a temporary force can override the value.

  3. Check the rung and repeat the transfer.

    If the input and tag agree, explain the condition the ladder instruction tests. Verify both clear and occupied receiving states after the correction, with temporary forces removed.

Inside Conveyor Rescue

One blocked indication.
More than one possible cause.

The Conveyor Rescue demo lets you investigate photoeye alignment, input mapping, and basic ladder conditions on a three-zone conveyor. Keep the free guide open for the concepts, then test your explanation against the simulated machine instead of assuming that every stopped belt needs a new sensor.

01

The box will not feed: call 1

Same initial complaint. Ask what changed, inspect the evidence, and explain the repair.

You practiceObserve. Diagnose. Prove.

02

The box will not feed: call 2

Same initial complaint. Ask what changed, inspect the evidence, and explain the repair.

You practiceObserve. Diagnose. Prove.

03

The box will not feed: call 3

Same initial complaint. Ask what changed, inspect the evidence, and explain the repair.

You practiceObserve. Diagnose. Prove.

You control the pace. Jump to a tool, ask the coach, or pause and step through the test.

Your demo progress is saved to your account.

Who is it for?

New to maintenance?
Already on the tools?
Start here.

Future technicians & students

See what troubleshooting involves. Connect unfamiliar PLC terms to a machine you can watch and control.

Working maintenance technicians

Practice checking the evidence before changing parts or code. Repeat a fault and see how your decisions affect the line.

Maintenance managers & trainers

Try the demo yourself and decide whether this approach fits your team. Use a scenario to talk through what a technician would check and why.

A clear starting point

Try the demo.
Tell us what comes next.

Available in the free demo: conveyor troubleshooting, photoeye alignment, input mapping, and basic ladder logic.

Our focus: realistic decisions, visible signals, proof of repair and repeat practice. The next lessons will be tested with technicians before we expand the library.

After trying a repair, you can optionally share your experience and interests to help shape the next lessons.

Your first callout is waiting

Try fixing it yourself.

Start with your email and a password. Confirm your email, then try a repair with optional step-by-step guidance. Background questions come later and are optional.

Start the free Conveyor Rescue demo

Create an account, confirm your email in the same browser, and start the demo. No approval needed.

Already have an account? Sign in
Why can a photoeye report blocked when the conveyor is clear?

In the simulation, compare beam alignment, the physical sensor input, the tag mapping, temporary forces, and the ladder condition. The blocked indication alone does not identify which layer disagrees with the clear space.

How do I distinguish a sensor issue from an input-mapping issue?

Compare the simulated physical input with the program tag. If the input responds correctly but the tag does not, investigate mapping and overrides. If the input itself disagrees with the modeled space, inspect the virtual sensor setup.

Does every photoeye use the same blocked and clear convention?

No. Real sensor behavior depends on sensing mode, output configuration, and equipment design. The demo defines its blocked tag for the exercise; do not treat that convention as a universal wiring rule.

Does this page replace the free photoeye troubleshooting guide?

No. The guide explains the sensor, input, mapping, and ladder concepts without an account. This page introduces the interactive practice where you compare those layers and test a correction.

Can I use the simulated settings on a real conveyor?

The settings and adjustments belong to an authored exercise. Real alignment, mounting, and work procedures must come from the equipment and sensor documentation and the site's authorized procedures.

How do I try the photoeye fault investigation?

Create a free account, confirm your email, and sign in to Conveyor Rescue. No card, physical photoeye, or PLC is required. Complete both clear and occupied verification conditions after trying a repair.