/services/b/weblog/posts/migrating-legacy-plc-5s-to-deltavWay back in the mid-1980’s, when I was a newly-minted engineer working oil & gas production projects offshore in the Gulf of Mexico, a new series of PLCs came on the scene to replace the Allen-Bradley PLC-2’s we had been using. They were the PLC-5 seriesen-USTelligent Community 13