The Unitronics Vision120 is a palm-sized PLC with a built-in Operator Panel. The panel offers a graphic display screen and keypad. This small, powerful device supports up to 256 I/Os (on-board plus expansion modules). A rich range of embedded features include multiple auto-tuned PID loops, internal 120K structured data table, loadcell support, and communication options such as GSM/SMS, MODBUS, CANbus, function blocks that enable Vision to communicate with devices using proprietary COM protocols, plus remote access and data export software utilities. MODbus GSM support - enables SMS messages.