PLC glossary
Reset
A request to return a value or piece of logic to a chosen starting condition. What it clears depends on the programme.
- Also called
- reset request
- On site
- An operator clears the bottle total before counting the next group.
- Siemens
- Counter R input; chart reset and output clearing follow the chart's defined policy.
- Rockwell
- Ladder RES or the ST counter Reset member; chart output clearing is a separate programme policy.
Taught in: Count events, not scans
Practise it on a 3D rig
- Count the arrivalsCount each bottle once. Stop at three.
- Count with a one-shotOne bottle covers the sensor for many scans. Count it once.
- Count bottles as they leaveCount each bottle as it clears the sensor, not as it arrives.
- It never reaches threeSomething keeps clearing the count. Find it.
- Review the AI: One bottle, one countCheck a bottle that stays under the sensor.