PLC glossary
Scan
One pass through reading inputs, running instructions and updating outputs. This academy normally repeats it every 20 milliseconds.
- Also called
- scan cycle
- On site
- While one bottle covers a sensor, the controller can read it many times.
- Siemens
- A cyclic organisation block, such as OB1, repeatedly runs the programme.
- Rockwell
- A task schedules routines; these lessons use a periodic task with buffered inputs.