Industrial Engineer · phase 5 of 16

PROFIBUS

Industrial fieldbus maintained by PROFIBUS and PROFINET International for controller and field-device communication.

The Explain card

Plain English: PROFIBUS is the serial fieldbus that came before PROFINET. It runs on a shielded twisted pair with purple jackets, at speeds that trade off against cable length.
Example: A 2010 vintage line has a Siemens controller polling drives and remote I/O over a single PROFIBUS DP segment, with termination switched on at both ends.
Why it matters: Millions of nodes are still running on it, and most faults come from termination, cable length or a bad connector rather than from any device. Knowing the rules for a segment is the difference between a five minute fix and a day of swapping parts.
Hook: The purple cable that refuses to retire.

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

The technician checks the PROFIBUS address and termination before commanding the variable frequency drive from the PLC.

Letter by letter

Where it came from

Origin: German engineering coinage formed from PROcess FIeld BUS
Entered the language: 1989
What changed: The project abbreviation became the standardized name and later the umbrella name for related protocol variants.

How it is spelled

Capitalisation: Written PROFIBUS in all capitals, including mid-sentence; variant labels are written PROFIBUS DP and PROFIBUS PA.
Plural and possessive: Use PROFIBUS networks for the plural and PROFIBUS's configuration for the singular possessive.
Out loud: Said as a word, not spelled out.

Same family

Broken into chunks

What it sits beside

Same subject

Same shape

PROFIBUS variants

PI technology names

Phase 5: PLC Industrial Communications

The protocols that let controllers, drives and operator panels talk, plus the addressing and description files that make them agree on what was said.