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M91-2-R2C Unitronics M91 Textual display and keyboard HMI and PLC onboard I/Os expands up to 150 I/Os
Unitronics M91-2-R2C Micro PLC with integrated text HMI, 10 digital inputs, 2 analogue inputs, 6 relay outputs, CANbus, RS232/RS485 communications and expandable I/O capability.
£535.52
Why Choose the Unitronics M91-2-R2C Micro PLC with Integrated HMI?
The Unitronics M91-2-R2C is a compact and highly capable Micro PLC with integrated text-based HMI, designed for industrial automation applications that require reliable control, operator interaction and analogue signal processing within a single device. As part of the proven Unitronics M91 series, it combines PLC functionality, an operator interface and onboard I/O to reduce hardware requirements and simplify installation.
Featuring a built-in 2-line, 16-character LCD display and a robust 15-key keypad, the M91-2-R2C enables operators to monitor machine status, adjust process parameters and access diagnostics directly from the controller. This eliminates the need for a separate HMI terminal while reducing panel space requirements.
With 10 digital inputs, 2 analogue inputs and 6 relay outputs, along with integrated communication ports and expansion capabilities, the M91-2-R2C is ideal for machine builders, OEMs and industrial automation engineers seeking a cost-effective all-in-one control solution.
Key Advantages
- Integrated PLC and operator interface in one compact controller.
- 2-line LCD display with built-in keypad.
- 10 digital inputs and 2 analogue inputs.
- 6 relay outputs for industrial control applications.
- Supports MODBUS, CANbus and serial communications.
- Expandable up to 150 I/O points.
- Reduces wiring, panel space and installation costs.
- Suitable for OEM equipment, process control and machine automation.
Key Features
- Unitronics M91 Micro-OPLC platform.
- 2-line × 16-character LCD display.
- 15-key operator keypad.
- 10 digital inputs.
- 2 analogue inputs supporting voltage and current signals.
- 6 relay outputs.
- 3 high-speed counter/shaft encoder inputs.
- RS232 and RS485 serial communications.
- Integrated CANbus connectivity.
- Real-time clock with battery backup.
- MODBUS networking support.
- DIN rail and panel mounting capability.
- Expansion support up to 150 I/O points.
Reliable Automation with Integrated Analogue Inputs
Unlike standard digital-only Micro PLCs, the M91-2-R2C includes two onboard analogue inputs capable of accepting voltage and current signals. This allows direct connection of sensors, transmitters and process instruments without requiring additional analogue modules, helping reduce system costs and complexity.
The controller also supports high-speed counting, encoder feedback, CANbus networking and MODBUS communications, making it suitable for a broad range of automation applications. Its integrated display and keypad allow operators to view process information and perform system adjustments directly from the controller.
Typical Applications
- Water and wastewater treatment systems.
- Pump and pressure booster stations.
- Packaging and labelling machinery.
- Material handling equipment.
- Building management and HVAC systems.
- Industrial process monitoring.
- OEM machine automation.
- Standalone control systems.
Technical Specifications
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| Supported Protocols | CANopen | |
|---|---|---|
| Product Series | Unitronics M91 | |
| Touch Technology | Keypad (non-touch) | |
| Communication | CANopen, RS232, RS485 | |
| Device Type | HMI + PLC | |
| IP Rating | IP65 | |
| Series | M91 | |
| Product type | Micro PLC with integrated HMI | |
| Power supply | 12/24 V DC | |
| Digital inputs | 10 | |
| Analogue inputs | 2 | |
| Relay outputs | 6 | |
| High-speed counter inputs | 3 | |
| Display | STN LCD, 2 lines × 16 characters | |
| Keypad | 15 keys | |
| Communication ports | RS232 / RS485 / CANbus | |
| Program memory | 36 KB virtual ladder memory | |
| Database capacity | 1024 integers | |
| Expansion capability | Up to 150 I/O points | |
| 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-R2C used for?
The M91-2-R2C is used for industrial automation applications requiring PLC control, analogue signal processing and operator interaction within a single compact controller.
How many inputs and outputs does the controller provide?
The controller includes 10 digital inputs, 2 analogue inputs and 6 relay outputs.
Does the M91-2-R2C include a built-in HMI?
Yes. The controller features a 2-line LCD display and a 15-key keypad for local monitoring and operation.
Can the system be expanded?
Yes. The M91-2-R2C supports expansion modules and can be expanded up to approximately 150 I/O points depending on the application.
Which communication protocols are supported?
The controller supports RS232, RS485, CANbus and MODBUS communications for integration into industrial automation networks.
Trusted by Industrial Automation Engineers
Unitronics M91 controllers are widely used throughout manufacturing, utilities and OEM machinery sectors, delivering dependable control, integrated operator interaction and flexible communications within a compact and cost-effective automation platform.
