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The language has two variants: ''Plex-C'' used for the AXE Central Processor (CP) and ''Plex-M'' used for Extension Module Regional Processors (EMRP).<ref name=Execution>{{cite web|url= http://www.mrtc.mdh.se/publications/0802.pdf|title= The Execution Model of APZ/PLEX - An Informal Description|accessdate= 2009-03-07|author= Johan Erikson and Bo Lindell|date= |publisher= Mälardalen University|archive-date= 2009-09-04|archive-url= https://web.archive.org/web/20090904215757/http://www.mrtc.mdh.se/publications/0802.pdf|url-status= dead}}</ref>
Ericsson started a project in the mid-1980s to create a successor language, which resulted in [[Erlang (programming language)|Erlang]]. According to co-creator [[Joe Armstrong (programmer)|Joe Armstrong]], "Erlang was heavily influenced by PLEX and the AXE design."<ref name=ErlangHistory/> Erlang did not replace PLEX, but was used alongside it.
==Execution model==
A system is divided into separately compiled and loaded units of code called "blocks." A block waits for one or more signals sent from elsewhere in the system, which triggers code execution.<ref name=Execution/>
==Pre-compilers==
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