UNITRONICS M91-T4-R6-ZK1 PLC controller

1. Product Description

The M91-T4-R6-ZK1 is a compact Programmable Logic Controller (PLC) featuring an integrated Operating Panel. This panel includes a 2-line text display and a 15-key keypad. It is designed to replace traditional "Relay-and-Timer" systems with a digital solution that offers sophisticated logic, communication, and human-machine interface (HMI) capabilities in a single, DIN-rail mounted unit.

2. Technical Specifications

3. Product Advantages

• Cost-Efficient: Combines a PLC, HMI, and I/Os in one device, significantly reducing hardware costs and wiring time.

• Space-Saving: The compact footprint is ideal for small electrical cabinets and machinery.

• User-Friendly Software: Uses U91 Configurator, a free, intuitive ladder logic programming environment.

• Integrated HMI: Allows operators to monitor data and enter parameters directly without needing an external screen.

• Robust Networking: Supports MODBUS (Master/Slave) and Unitronics' proprietary CANbus (with add-on) for networking multiple units.

4. Key Applications

This micro-PLC is widely used in standalone machinery and small automation projects, including:

• Pumping Systems: Water pressure control and level monitoring.

• HVAC Control: Managing fans, dampers, and temperature sensors in buildings.

• Packaging Machinery: Simple conveyors, labeling, and filling machines.

• Oven & Furnace Control: Temperature profiling and timing.

• Access Control: Managing gates, shutters, and security barriers.

5. Important Considerations (Usage Notes)

• Power Supply: Ensure a stable 24VDC power source. Using an unregulated supply may damage the internal electronics.

• Relay Lifespan: Since the outputs are mechanical relays, consider the switching frequency. For high-speed switching, external solid-state relays should be used to prevent premature wear.

• Environmental Protection: The front panel is rated IP65/NEMA4X when panel-mounted, but the rear of the unit must be protected from dust and moisture.

• Back-up Battery: Check the internal battery periodically if your application relies on data retention during power outages.

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