PEN are created and maintained by the Internet Assigned Number Authority (IANA) in a public registry, including a publicly revealed email address and contact name. Through the SMT-CONFIURATOR (software), the computer is ready to read and write the programs contained in iSmart and oversee on line operation in iSmart. Compare TECO SG2 to other PACs, PLCs and Programmable Relays. Expansion modules with independent power supply.