Allen Bradley PLC Allen Bradley PLC

The first PLC of Allen Bradley PLCs was the Allen Bradley PLC in the PLC5 family market. PLC2, built in the 1980s, is now obsolete. PLC3s were also released in the 1980s, followed by PLC5, which is still in use today. The first system with a large, wide rack was about twice the length of PLC in the SLC500 family.

SLC500: In 1991 Allen-Bradley introduced the first SLC500. This platform was smaller than PLC5 in terms of dimensions and had a simpler structure. The full name of the SLC is "Small Logic Controller". The first SLC was the prototype SLC500, which was an integrated platform including processor, power supply and IO all in one package with 1KB of memory for small applications and limited I / O.

The first type of rack mount SLC was SLC5 / 01. This processor was placed in a rack with a power supply. Also, I / O input and output cards were installed on the same rack next to the CPU. Various types of digital input and output cards, analog and special input and output cards such as thermocouples and High-Speed ​​Counters were produced for this PLC that could be installed next to the CPU, as well as processors with more memory, higher speeds and advanced communication capabilities.

PLC 5/02 and 5/03 series had DH485 ("high speed data") communication capability
PLC 5/03 series was the first processor that at that time had the ability to download and view Logic Control online.

The 5/04 PLC had more memory and a faster communication platform (DH +) (Data Highway Plus).

The 05/05 PLC had a serial port, but was the first Ethernet service provider.

Application of Allen Bradley PLCs

Micrologix family PLCs used the RSLogix 500 for programming. This software was usable for the SLC family. The first PLC to introduce this family was the Micrologix 100, which was built with a combination of several different inputs and outputs (analog and digital) similar to the SLC500 series.

The production of this product was a response to the need for a low-cost platform to compete with other manufacturers of automation products. Also, despite its resemblance to the SLC platform, it had newer changes and could be configured modularly. The Micrologix platform does not use a rack to hold PLC, but PLC and cards can be mounted on rails or trays.