Red Seal Electrician Practice
Signalling and communicationQuestion 122 of 1506

What does the name of a network such as Profibus cover?

  1. Only the colour of the cable and the type of its outer jacket on it
  2. Only the program that runs in the PLC at each node
  3. Only the style of connector that is used at each node
  4. A communications standard: wiring, voltage levels, timing and pinouts
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Correct answer: A communications standard: wiring, voltage levels, timing and pinouts

Two devices communicate only if they follow the same standard.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.2: Networks and Busses

Practice signalling and communication

Questions last reviewed: 18 October 2026