Allen-Bradley PLC

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Allen Bradley Programmable Controller with programmer


Allen-Bradley PLC installed in a control panel

Allen-Bradley is the brand-name of a line of factory automation equipment owned by Rockwell Automation. The company, with revenues of approximately US $6.4 billion in 2013, manufactures programmable logic controllers (PLC), human-machine interfaces, sensors, safety components and systems, software, drives and drive systems, contactors, motor control centers, and systems of such products. 
Rockwell Automation also provides asset-management services including repair and consulting. Rockwell Automation's headquarters is in Milwaukee, Wisconsin.

Types of AB PLC 


    The history of Rockwell Automation goes back to 1903.The Compression Rheostat Company was founded by Lynde Bradley and Dr. Stanton Allen and has an initial investment of $1,000.In 1904, Harry Bradley, 19 years old, and his brother joined the business. The Rockwell Automation factory equipment line brand name is Allen Bradley.

Allen Bradley PLC2 / PLC3 / PLC5  family

  • The first Allen Bradley PLC  in the market was PLC5 family.
  • PLC2, which was made in the 1980s and is now obsolete.
  • PLC3s were released in the 1980s also, followed by the PLC5, which is still used today, not widely. first large/wide rack system, with about twice the horizontal dimension of the SLC500.

 `    SLC full name is “Small Logic Controller”. The first SLC, Known simply as an SLC500, was an integrated platform containing the CPU, power supply, and IO all in one package. with 1K of memory and was used in small i/o application

The first rack-based SLC was the SLC5/01.

  • The 5/02 and 5/03 platforms had DH485 (“Data Highway”) communications
  • The 5/03 was the first processor where logic could be edited online in real time without having to place the processor in program mode and download.
  • The 5/04 had even more memory and a faster communications platform called DH+ (“Data Highway Plus”).
  • The 5/05 had a serial port but also was the first to provide Ethernet communications.

This processor was used in a rack with power supply.

The I/O cards also available in a rack.

  • Different type of i/o card having digital, analog and special purpose I/O such as thermocouples and High-Speed Counters. processors had more memory, faster speeds, and enhanced communication capabilities.

 Allen Bradley PLC : Micrologix family

The Micrologix family used the RSLogix 500 for programming purpose.

This software same for SLC Family.

The first of the family introduce was the Micrologix 100, PLC that was made with several different I/O combinations. Same as the SLC500.

Its creation was a response to the need for a less expensive platform to compete with other manufacturers.

Blog Posted By : J.Jagan Rupchand. M.E.,
                              Lecturer / EEE

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