Industrial Engineer · phase 7 of 16

PAC

Programmable Automation Controller, an industry term for a PLC-class controller with broad integration, motion, networking, or computing capabilities.

The Explain card

Plain English
A programmable automation controller is what vendors call a PLC that has grown up. It runs the same kind of scan logic and adds motion, more networking, more memory, and often a general purpose language on the side.
Example
A ControlLogix or a Siemens S7 1500 is marketed as a PAC. It coordinates twenty servo axes, talks to the MES, and still solves ladder for the conveyors.
Why it matters
The word is mostly marketing, and the hardware is real. Knowing that a PAC is still a PLC underneath keeps you from expecting it to behave like a PC, and from being surprised when its scan and its I/O follow the same rules.
Hook
A PLC with a bigger business card.

Word knowledge

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

In a sentence

During commissioning, the engineer maps encoder feedback, motor interlocks, and EtherNet/IP drive tags into the PAC project before starting the conveyor.

Letter by letter
  • P Programmable the adjective opening the source phrase
  • A Automation the middle noun
  • C Controller the head noun
Where it came from
Origin
English industrial coinage formed from the initials of Programmable Automation Controller by ARC Advisory Group analyst Craig Resnick
Entered the language
2001
What changed
It began as a category label and later became a widely used vendor term whose boundaries sometimes overlap with PLC.
How it is spelled
Capitalisation
PAC is written in all capitals, including mid-sentence.
Plural and possessive
The plural is PACs, the singular possessive is PAC's, and the plural possessive is PACs'.
Out loud
Spelled out letter by letter.

Same family

  • PLC
  • DCS
  • RTU
  • IPC
Broken into chunks
  • program
    • programmable
    • programming
  • automat
    • automatic
    • automation
  • control
    • controller
    • controlling
What it sits beside

Same subject

Same shape

industrial controller initialisms

three-letter automation abbreviations

Where it sits in the deck

Phase 7: PLC Related Automation Systems

The neighbors a PLC lives beside on a plant floor, from operator panels and SCADA up to the motion and batch systems it hands work to.

Neighbours in this phase