Industrial Engineer · phase 4 of 16
Bit / BOOL
Single Boolean value that is either false or true.
The Explain card
- Plain English
- A BOOL is a single bit that is either true or false, on or off, one or zero. It is the smallest thing a controller stores and the thing most of its decisions are made from.
- Example
- Motor_Running is a BOOL. So is every contact and coil in a ladder program, and every discrete input and output on a card.
- Why it matters
- Bits pack together into bytes and words in memory, which is why a badly aimed word move can wipe thirty two of them at once. Keep bits in named tags rather than in slices of an integer unless you enjoy that kind of surprise.
- Hook
- The atom of control.
Where it sits in the deck
Phase 4: PLC Memory, Tags, and Instructions
The data a program moves and the instructions that move it, from a single true or false value up to a structured array.
