MJ20-ET1 Ethernet communication port allows users to connect over TCP/IP as client/server, and communicate using Modbus master/slave over TCP/IP with other Jazz PLCs, Unitronics Vision PLCs and other third-party devices. Jazz 2 models feature 48 K (virtual) ladder logic memory, have 30 times faster performance as their Jazz series counterparts and contain a new, built-in mini USB programming port.