The Unitronics Samba SM35 is an all-in-one, palm-sized programmable logic controller that integrates a full-function PLC with an elegant 3.5-inch color touch HMI. Purpose-built for small to medium-sized automation applications where panel space is limited and cost-effectiveness is critical, the Samba SM35 eliminates the need for separate PLC, HMI, and I/O modules. Its flat fascia design and IP66/IP65/NEMA4X environmental rating make it especially well-suited for industries with stringent hygiene and washdown requirements, including food and beverage processing, pharmaceutical manufacturing, and packaging machinery.

Under the hood, the Samba SM35 is equipped with a powerful 32-bit processor achieving a scan time of 15 microseconds per 1K of typical application code. Application memory includes 112KB of logic storage, 1MB for images, and 512KB for fonts. The controller supports up to 24 user-designed screens and 40 images per application. All memory sections and the real-time clock are backed by a replaceable battery with a typical service life of 7 years at 25 degrees Celsius. The controller operates on a 24VDC power supply with a permissible input voltage range of 20.4 to 28.8VDC.

The Samba SM35 is available in multiple I/O configurations to precisely match application requirements. The RA22 model provides 12 digital inputs, one of which can be configured as a 30kHz high-speed counter or shaft-encoder input. It also includes two 12/14-bit analog inputs (supporting 0-10V, 0-20mA, and 4-20mA signals), two PT100/thermocouple inputs (supporting types B, E, J, K, N, R, S, T), eight relay outputs (rated 3A per output, 8A per common), and two 12-bit analog outputs. The T20 model substitutes transistor outputs for relays and includes seven PWM/high-speed outputs at 0.5kHz. The TA22 model offers the most comprehensive I/O mix with 12 digital inputs, two analog/digital inputs, two TC/PT100 inputs, eight transistor outputs, and two 12-bit analog outputs.

Communication capabilities are designed for flexibility. The 3.5-inch models feature a built-in RS232 programming port. Users can add one or two optional expansion modules: a serial RS485 or Ethernet interface module, or a CANbus module. The controller supports an extensive array of industrial protocols including Modbus TCP/RTU, CANopen, SNMP, BACnet, KNX, M-Bus, DF1, and J1939. A Function Block protocol builder enables adaptation to virtually any third-party serial, TCP/IP, or CANbus protocol. For remote connectivity, Samba supports GPRS/GSM modems, email and SMS alerts, and 3G modem integration. Cloud-based monitoring and remote maintenance can be achieved by pairing an Ethernet module with a UniCloud-enabled router.

All aspects of the Samba SM35 are programmed using Unitronics' free VisiLogic software. This all-in-one development environment unifies hardware configuration, ladder logic programming, and HMI screen design into a single intuitive interface. VisiLogic includes a rich library of industrial images, a string library for instant multi-language HMI switching, and utilities for remote PC access and data export. The software also provides ready-to-use function blocks for common automation tasks. With its unmatched combination of compact form factor, powerful features, and integrated I/O, the Unitronics Samba SM35 delivers exceptional value for OEMs and system integrators seeking a reliable, space-saving control solution for countless standalone machine and process control applications.

Technical Specifications