PLC glossary
Tag
A name for a value in the programme. Start and PumpOn can name a button request and a pump command.
- Also called
- variable
- On site
- A tank level reading is stored under a name the engineer can watch.
- Siemens
- Local SCL references use #; global data can use named data-block members.
- Rockwell
- Tags can be controller-scoped or program-scoped; ST references do not use #.
Taught in: Know what a tag represents