Description

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1. Product Overview

The Alerton VLC-853-E is a BACnet-compliant programmable field controller designed for building automation and HVAC control systems. Developed by Alerton (Honeywell Building Technologies), it belongs to the VisualLogic® VLC controller series, widely used in energy management and building management systems (BMS).

The controller is engineered to manage and monitor HVAC equipment such as air handling units (AHUs), central plant systems, clean rooms, fume hoods, and large terminal units. It communicates with other BACnet devices over an MS/TP network, enabling seamless integration with building automation systems.

Programming is performed using Alerton’s VisualLogic graphical programming environment, allowing engineers to create or modify control logic directly in the field. Configuration and operating data are stored in non-volatile flash memory, ensuring stable operation even after power loss.

 

2. Technical Specifications

Model: VLC-853-E

Manufacturer: Alerton (Honeywell)

Product Type: BACnet programmable field controller

Power Supply: 24 VAC, 50/60 Hz (minimum 15 VA)

Processor: 32-bit ARM Cortex-M4F, 80 MHz

Memory: Non-volatile flash memory for program storage

Input / Output Configuration

Universal Inputs: 8 (16-bit resolution)

Supports:

Thermistors (3k or 10k type II)

Dry contact

Pulse input (up to 100 Hz)

0–5 V / 0–10 V

0–20 mA or 4–20 mA (with resistor)

Binary Outputs: 5 triac outputs (24 VAC, 500 mA continuous)

Analog Outputs: 3 (0–10 V or 4–20 mA)

Communication

Protocol: BACnet MS/TP (Application Specific Controller)

Interface: RS-485 (EIA-485)

Communication speed: 9.6 kbps – 115.2 kbps auto-baud

Environmental

Operating Temperature: −17 °C to 70 °C

Humidity: 5–95% RH non-condensing

Dimensions: approx. 125 × 137 × 36 mm

3. Key Features and Advantages

BACnet Native Integration
The VLC-853-E communicates directly on a BACnet MS/TP network, enabling straightforward integration with building management systems and other BACnet devices.

Graphical Programming (VisualLogic)
The controller uses Alerton’s VisualLogic graphical programming platform, making control logic easier to develop, modify, and maintain compared with traditional code-based programming.

Flexible Universal Inputs
Eight universal inputs support multiple signal types—including temperature sensors, dry contacts, voltage, and current signals—allowing the controller to adapt to various HVAC applications.

High-Speed DDC Processing
The controller executes control logic with an internal loop time of approximately 100 ms, ensuring responsive control for dynamic HVAC systems.

Backward Compatibility
The VLC-853-E remains compatible with earlier VLC-853 and VLC-853C3 controllers, simplifying upgrades and system expansion.

4. Typical Applications

Air Handling Unit (AHU) Control
Controls fans, dampers, and temperature sensors for efficient airflow and climate regulation in commercial buildings.

Central Plant Equipment
Used in chiller plants or boiler systems to manage pumps, valves, and cooling equipment.

Clean Room and Laboratory Systems
Ensures precise environmental control in facilities requiring strict air quality and pressure regulation.

Large HVAC Terminal Units
Provides reliable monitoring and control for complex HVAC terminal equipment.

5. Frequently Asked Questions (FAQ)

Q1: What type of controller is the Alerton VLC-853-E?
It is a BACnet-compliant programmable field controller designed for HVAC and building automation systems.

Q2: How many I/O points does the controller support?
The controller provides 8 universal inputs, 5 binary outputs, and 3 analog outputs, allowing flexible integration with sensors and actuators.

Q3: What programming software is used for the VLC-853-E?
It is programmed using Alerton VisualLogic within the Alerton building automation software environment.

Q4: What network protocol does the controller use?
The VLC-853-E communicates via BACnet MS/TP over RS-485, enabling integration with BACnet-based BMS systems.