M91-2-T1 Unitronics M91 Textual display and keyboard HMI and PLC onboard I/Os expands up to 150 I/Os

Why Choose the Unitronics M91-2-T1 Micro PLC with Integrated Text HMI?

The Unitronics M91-2-T1 is a compact micro PLC with integrated text-based HMI from the Unitronics M90/M91 series. Designed for small to medium industrial automation systems, it combines programmable logic control, operator interface and onboard I/O in a single controller, reducing wiring, panel space and system complexity.

The controller features a built-in two-line LCD display capable of showing 16 characters per line along with a 15-key operator keypad. This allows operators to monitor machine status, navigate menus and adjust parameters directly from the device without requiring a separate HMI panel.

The M91-2-T1 provides 12 digital inputs and 12 transistor outputs, making it suitable for controlling sensors, actuators and automation equipment. Several inputs can operate as high-speed counters or shaft-encoder inputs, while two outputs support PWM functionality for high-speed control applications.

Key Features

• Integrated PLC and text HMI in a single compact controller.
• 2-line LCD display with 16 characters per line.
• 12 digital inputs including high-speed counter capability.
• 12 transistor outputs including PWM outputs.
• High-speed counter inputs supporting encoder and frequency measurement.
• RS232 and RS485 communication supporting Modbus protocols.
• I/O expansion capability for additional modules.
• Compact design suitable for panel or DIN-rail mounting.

Technical Specifications

• Manufacturer: Unitronics
• Series: M90 / M91
• Model: M91-2-T1
• Controller type: Micro PLC with integrated text HMI
• Display: STN LCD monochrome display
• Display size: 2 lines × 16 characters
• Keypad: 15 operator keys
• Supply voltage: 12 / 24 V DC (10.2 to 28.8 V DC)
• Digital inputs: 12 inputs (including 2 high-speed counters)
• Digital outputs: 12 transistor outputs (PNP)
• High-speed outputs: 2 PWM / high-speed outputs
• Communication ports: RS232 and RS485
• Program capacity: approx. 36 kB ladder logic
• Expansion capability: supports local I/O expansion modules
• Protection rating: IP65 / NEMA 4X when panel mounted
• Operating temperature: 0 °C to 50 °C

Typical Applications

• Machine automation and OEM equipment.
• Packaging and material handling systems.
• Water treatment and pump control.
• Industrial process monitoring.
• Standalone automation systems requiring local operator interface.

Trusted by Machine Builders

Unitronics M90 and M91 PLCs are widely used in industrial automation because they combine programmable control and operator interface in a compact and cost-effective platform for small and medium control systems.