PLC glossary
Comparison
A test that compares two values and gives TRUE or FALSE. Level > 90 asks whether the level exceeds 90.
- Also called
- compare
- On site
- The controller compares the measured tank level with its filling limit.
- Siemens
- SCL comparison operators; CMP boxes in graphical languages.
- Rockwell
- ST comparison operators; v38 Ladder uses LT/GT/EQ/NE/LE/GE.