PLC glossary
State machine
A programme that remembers which part of a job it is in. It defines commands and permitted changes for each part.
- Also called
- state-machine
- On site
- A batch can be Running, Held or Complete, with different commands in each state.
- Siemens
- Often written with CASE and a stored state value in SCL.
- Rockwell
- Often written with CASE and a state tag in ST.