The first of the family introduce was the Micrologix 100, PLC that was made with several different I/O combinations. The Micrologix family used the RSLogix 500 for programming purpose. Must Read : Plc inputs and outputs Allen Bradley PLC : Micrologix family Must Read : Types of plc used in industry
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. 
This processor was used in a rack with power supply.
The 5/05 had a serial port but also was the first to provide Ethernet communications. The 5/04 had even more memory and a faster communications platform called DH+ (“Data Highway Plus”). 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 5/02 and 5/03 platforms had DH485 (“Data Highway”) communications. The first rack-based SLC was the SLC5/01. with 1K of memory and was used in small i/o application The first SLC, Known simply as an SLC500, was an integrated platform containing the CPU, power supply, and IO all in one package. SLC full name is “Small Logic Controller”. This platform was physically smaller than the PLC5, with a reduced instruction set. SLC500: In 1991 Allen-Bradley released the first SLC500. Must Read : 5 Most Popular PLC programming languages nowdays Must Read : Top 15 best Advantage of plc over relay Allen Bradley PLC : SLC family first large/wide rack system, with about twice the horizontal dimension of the SLC500. 
PLC3s were released in the 1980s also, followed by the PLC5, which is still used today, not widely. PLC2, which was made in the 1980s and is now obsolete. The first Allen Bradley PLC in the market was PLC5 family. Allen Bradley PLC5, SLC500, Micrologix : Software Details. Allen Bradley PLC : Controllogix family. Must Read : Top 15 best Advantage of plc over relay. Allen Bradley PLC2 / PLC3 / PLC5 family.
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