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M91-2-R1 Unitronics M91 Textual display and keyboard HMI and PLC onboard I/Os expands up to 150 I/Os
Unitronics M91-2-R1 Micro PLC with integrated text HMI, featuring 10 digital inputs, 1 analogue input, 6 relay outputs, RS232/RS485 communications and expandable I/O capability.
£419.49
Why Choose the Unitronics M91-2-R1 Micro PLC with Integrated HMI?
The Unitronics M91-2-R1 is a compact and cost-effective Micro PLC with integrated text-based HMI, designed for small to medium industrial automation applications. As part of the reliable Unitronics M91 series, it combines programmable logic control, operator interface functionality and onboard I/O into a single unit, helping reduce wiring, panel space and overall system costs.
Featuring a built-in 2-line, 16-character LCD display and a durable 15-key keypad, the M91-2-R1 allows operators to monitor machine status, adjust parameters and troubleshoot processes directly from the controller without requiring a separate HMI terminal.
With 10 digital inputs, 1 analogue input and 6 relay outputs, along with integrated communication capabilities and I/O expansion support, the M91-2-R1 provides a practical automation solution for OEM equipment, process control systems, water treatment installations and standalone machinery.
Key Advantages
- Integrated PLC and operator interface in a single compact unit.
- 2-line LCD text display with built-in keypad.
- 10 digital inputs and 1 analogue input.
- 6 relay outputs for industrial control applications.
- Built-in RS232/RS485 communications.
- Supports MODBUS networking and remote communications.
- Expandable I/O capability for growing automation systems.
- Reduces installation and maintenance costs.
Key Features
- Unitronics M91 Micro-OPLC platform.
- 2-line × 16-character LCD display.
- 15-key sealed membrane keypad.
- 10 configurable PNP/NPN digital inputs.
- 1 analogue input (0-10V, 0-20mA, 4-20mA).
- 6 relay outputs.
- 3 high-speed counter/shaft encoder inputs.
- RS232/RS485 communication port.
- Real-time clock with battery backup.
- MODBUS and OPC server compatibility.
- DIN rail or panel mounting options.
- I/O expansion capability up to 150 I/O points.
Compact PLC and HMI Solution for Industrial Control
The Unitronics M91-2-R1 is engineered for applications where space, simplicity and reliability are essential. By integrating a PLC, operator interface and communication capabilities into one device, it eliminates the need for separate control and display hardware while simplifying installation and maintenance.
Its support for analogue inputs, high-speed counters, MODBUS communications and I/O expansion makes it suitable for a wide range of automation applications, from standalone machinery to distributed control systems. The integrated HMI enables operators to access system information and perform adjustments directly from the controller.
Typical Applications
- Water and wastewater treatment systems.
- Packaging and labelling machinery.
- Material handling and conveyor systems.
- Pump and booster control stations.
- HVAC and building automation systems.
- Standalone industrial machines.
- OEM equipment and process control systems.
- Small to medium industrial automation projects.
Technical Specifications
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| Device Type | HMI + PLC | |
|---|---|---|
| Product Series | Unitronics M91 | |
| Touch Technology | Keypad (non-touch) | |
| Communication | RS232, RS485 | |
| IP Rating | IP65 | |
| Series | M91 | |
| Product type | Micro PLC with integrated HMI | |
| Power supply | 12/24 V DC | |
| Digital inputs | 10 configurable PNP/NPN | |
| Analogue inputs | 1 | |
| Relay outputs | 6 | |
| High-speed counter inputs | 3 | |
| Display | STN LCD, 2 lines × 16 characters | |
| Keypad | 15 keys | |
| Communication ports | RS232 / RS485 | |
| Expansion capability | Up to 150 I/O points | |
| Program memory | 36K virtual ladder memory | |
| Database | 1024 integers | |
| Protection rating | IP65 when panel mounted | |
| Operating temperature | 0°C to 50°C | |
| Weight | Approx. 310 g | |
| Mounting type | DIN rail or panel mounting |
Frequently Asked Questions
What is the Unitronics M91-2-R1 used for?
The M91-2-R1 is used for industrial automation applications requiring compact PLC control with an integrated operator interface and onboard I/O.
How many inputs and outputs does the M91-2-R1 provide?
The controller includes 10 digital inputs, 1 analogue input and 6 relay outputs.
Does the controller include an HMI?
Yes. The M91-2-R1 includes a built-in 2-line LCD display and a 15-key keypad for local operation and monitoring.
Can additional I/O modules be added?
Yes. The controller supports expansion modules and can be expanded up to approximately 150 I/O points depending on system configuration.
What communication protocols are supported?
The controller supports RS232/RS485 communications, MODBUS networking and OPC server connectivity for integration with industrial automation systems.
Trusted by Industrial Automation Professionals
Unitronics M91 Micro-OPLC controllers are widely used in industrial automation, OEM machinery and process control applications where compact design, integrated operation and dependable performance are essential requirements.
