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M91-2-UA2 Unitronics M91 Textual display and keyboard HMI and PLC onboard I/Os expands up to 150 I/Os
Unitronics M91-2-UA2 Micro PLC with integrated text HMI, featuring 10 digital inputs, configurable analogue and thermocouple inputs, 10 transistor outputs, 2 analogue outputs and RS232/RS485 communications.
£734.85
Why Choose the Unitronics M91-2-UA2 Micro PLC with Integrated HMI?
The Unitronics M91-2-UA2 is a highly capable Micro PLC with integrated text-based HMI, designed for industrial automation applications requiring digital control, analogue processing, temperature monitoring and analogue output functionality within a single compact controller. As part of the proven Unitronics M91 series, it combines PLC control, operator interface capabilities and onboard I/O, helping reduce panel space, wiring complexity and installation costs.
Featuring a built-in 2-line, 16-character LCD display and a robust 15-key keypad, the M91-2-UA2 enables operators to monitor processes, adjust operating parameters and perform diagnostics directly from the controller. This integrated design eliminates the need for a separate HMI while maintaining a simple and cost-effective automation platform.
With 10 digital inputs, 2 configurable analogue/temperature inputs, 10 transistor outputs and 2 analogue outputs, the M91-2-UA2 is ideally suited to process automation, temperature control, OEM machinery, water treatment systems and industrial monitoring applications. The controller also supports PID control, MODBUS communications and local I/O expansion for enhanced flexibility.
Key Advantages
- Integrated PLC and operator interface in one compact controller.
- 2-line LCD display with built-in keypad.
- 10 digital inputs and 2 configurable analogue/temperature inputs.
- 10 transistor outputs including PWM functionality.
- 2 analogue outputs for process control applications.
- Supports thermocouple temperature measurement.
- Built-in RS232 and RS485 communications.
- Supports MODBUS networking and industrial integration.
- Expandable up to 150 I/O points.
Key Features
- Unitronics M91 Micro-OPLC platform.
- 2-line × 16-character STN LCD display.
- 15-key membrane keypad.
- 10 digital inputs.
- 2 configurable analogue / thermocouple inputs.
- 10 PNP transistor outputs.
- 2 analogue outputs (0-10 V, 4-20 mA).
- 1 high-speed counter input up to 10 kHz.
- 2 PWM outputs.
- RS232 and RS485 serial communications.
- Auto-tune PID control with up to 4 loops.
- Real-time clock with battery backup.
- MODBUS RTU protocol support.
- I/O expansion support up to 150 points.
Ideal for Process and Temperature Control
The Unitronics M91-2-UA2 is specifically designed for applications requiring both measurement and control functions. Its configurable analogue inputs can be used for standard process signals or thermocouple temperature monitoring, while the integrated analogue outputs allow direct control of drives, valves, actuators and process equipment.
Combined with PID control, transistor outputs and communication capabilities, the controller delivers a complete automation platform for industrial systems. The integrated display and keypad provide local monitoring and control without requiring additional operator interface hardware.
Typical Applications
- Temperature control systems.
- Water and wastewater treatment plants.
- Industrial process automation.
- HVAC and environmental control systems.
- Pump and pressure management applications.
- Food and beverage processing equipment.
- OEM machinery and equipment.
- Building management systems.
Technical Specifications
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| Supported Protocols | Modbus RTU | |
|---|---|---|
| Touch Technology | Keypad (non-touch) | |
| Communication | RS232, RS485 | |
| Device Type | HMI + PLC | |
| Product Series | Unitronics M91 | |
| IP Rating | IP65 | |
| Series | M91 | |
| Product type | Micro PLC with integrated HMI | |
| Power supply | 24 V DC nominal | |
| Operating voltage | 20.4 to 28.8 V DC | |
| Digital inputs | 10 | |
| Analogue / temperature inputs | 2 configurable inputs | |
| Thermocouple support | Types B, E, J, K, N, R, S, T | |
| Digital outputs | 10 transistor outputs | |
| Analogue outputs | 2 | |
| PWM outputs | 2 | |
| High-speed counter | 1 × 10 kHz, 32-bit | |
| Display | STN LCD, 2 lines × 16 characters | |
| Keypad | 15 keys | |
| Communication ports | RS232 / RS485 | |
| Protocol support | MODBUS RTU, OPC | |
| Program memory | 36 KB virtual ladder memory | |
| Database capacity | 1024 integers | |
| Protection rating | IP65 / NEMA 4X when panel mounted | |
| Operating temperature | 0°C to 50°C | |
| Mounting type | Panel or DIN rail mounting |
Frequently Asked Questions
What is the Unitronics M91-2-UA2 used for?
The M91-2-UA2 is used for industrial automation applications requiring machine control, analogue processing, temperature monitoring and analogue output control.
Does the controller support thermocouple inputs?
Yes. The configurable analogue inputs support multiple thermocouple types including J, K, T, E, N, R, S and B.
How many outputs are available?
The controller provides 10 transistor outputs and 2 analogue outputs for machine and process control applications.
Does the M91-2-UA2 support PID control?
Yes. The controller includes auto-tune PID functionality supporting up to four independent control loops.
Can the controller be expanded?
Yes. The M91-2-UA2 supports local I/O expansion modules and can be expanded up to approximately 150 I/O points depending on system requirements.
Trusted by Industrial Automation Professionals
Unitronics M91 Micro-OPLC controllers are widely used across industrial automation, utilities, OEM machinery and process control sectors, delivering reliable PLC functionality, integrated operator interaction and flexible control capabilities within a compact platform.
