Description The Automated Logic ZN551 is a programmable BACnet zone controller designed to provide intelligent control of HVAC equipment in commercial building automation systems. The Automated Logic ZN551 supports single-zone applications such as VAV boxes, heat pumps, unit ventilators, fan coil units, and packaged HVAC equipment while delivering distributed control through native BACnet communications. Technical Specifications Condition New/Never Used Surplus Brand Automated Logic Category PLCs/Machine Control Part Number ZN551 Subcategory PLC Module/Rack Product Type BACnet Zone Controller Controller Profile BACnet Advanced Application Controller (B-AAC) Communication Protocol BACnet MS/TP (EIA-485) Universal Inputs 5 (Thermistor, Dry Contact, 0–5 VDC on Inputs 1 and 2) Binary Outputs 5 Relay Outputs Analog Outputs 1 × 0–10 VDC Power Supply 24 VAC ±10%, 50–60 Hz or 26 VDC Power Consumption 15 VA Programming Software EIKON® Compatible System Automated Logic WebCTRL® Building Automation System Operating Temperature 0°F to 130°F (-17.8°C to 54.4°C) Operating Humidity 10% to 90% Non-Condensing Dimensions 5.06 × 5.69 × 1.50 in. (129 × 144 × 38 mm) Weight 0.45 kg Information About ZN551 The ZN551 is part of the Automated Logic WebCTRL® building automation platform and functions as a native BACnet Advanced Application Controller (B-AAC) for single-zone environmental control. It communicates using BACnet MS/TP over an EIA-485 network and integrates seamlessly with the WebCTRL building automation system for centralized monitoring and programming. The controller features five universal inputs, five binary outputs, and one analog output, allowing flexible integration with sensors, actuators, and HVAC equipment. Designed for commercial building automation, it supports EIKON® graphical programming, Automated Logic communicating sensors, remote firmware updates, and distributed control for energy-efficient HVAC operation. Key Features: Native BACnet Controller: Operates as a BACnet Advanced Application Controller (B-AAC) using BACnet MS/TP communications. Flexible I/O Configuration: Supports five universal inputs, five binary outputs, and one analog output for versatile control applications. WebCTRL Integration: Connects directly with the Automated Logic WebCTRL building automation system for centralized management. EIKON Programming Support: Compatible with EIKON graphical programming software for custom HVAC control sequences. Distributed Processing: Performs independent control without relying on other controllers across the network. Multiple HVAC Applications: Suitable for VAV systems, heat pumps, fan coil units, lighting control, and unit ventilators. Remote Firmware Updates: Supports firmware upgrades and commissioning through the WebCTRL platform. Communicating Sensor Compatibility: Works with Automated Logic room sensors and touchscreen interfaces for monitoring and adjustment. The ZN551 delivers the reliability and precision required for intelligent single-zone HVAC control within commercial building automation systems.
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