UNITRONICS M91-2-R1 12/24V PROGRAMMABLE LOGIC CONTROLLER

Description:

The Unitronics M91-2-R1 Programmable Logic Controller is a 12/24 VDC Micro-OPLC with an integrated text-based HMI, onboard digital and analog I/O, and relay outputs for industrial automation and machine control systems. Commonly installed in packaging equipment, material handling systems, pump stations, HVAC controls, and OEM machinery requiring compact PLC and operator interface functionality. Maintenance technicians, OEMs, and system integrators use this controller for replacement, retrofit, automation upgrades, and new control system installations.

Applications:

The Unitronics M91-2-R1 is designed for factory automation, conveyor systems, water and wastewater treatment, packaging machinery, building automation, and standalone machine control applications where integrated logic control, operator interaction, and scalable I/O capabilities are required. It supports small to medium automation tasks and can be expanded with compatible I/O modules to accommodate evolving system requirements. 

Technical Specifications:

• Brand: Unitronics
• Part Number: M91-2-R1
• Product Type: Programmable Logic Controller (Micro-OPLC with Integrated HMI)
• Supply Voltage: 12/24 VDC
• Digital Inputs: 10 configurable PNP/NPN inputs
• Analog Inputs: 1 onboard analog input
• Relay Outputs: 6 relay outputs
• Display: 2-line × 16-character LCD text display
• Keypad: Integrated 15-key operator interface
• Communication Ports: RS232 / RS485
• Supports MODBUS communication protocol
• Expansion Capability: Supports I/O expansion modules up to 150 I/O points
• High-Speed Inputs: Supports high-speed counter/shaft encoder functions on selected inputs
• Application Memory: 36K virtual ladder memory
• Designed for industrial automation and machine control applications
• Suitable for OEM equipment, retrofit, and maintenance installations

Common Replacements:

• Unitronics M91-2-R2C
• Unitronics JZ20-R31
• Unitronics Vision V130-33-R34