Product Overview
The Allen-Bradley 1766-L32BXB is a MicroLogix 1400 Controller from the Bulletin 1766 family, engineered for demanding industrial automation applications. This compact controller integrates three communication ports—a combined RS232/RS485 port, an isolated RS232 port, and an Ethernet port—giving you flexible connectivity for diverse control networks.
With 32 embedded I/O points, the 1766-L32BXB handles mixed input voltages and mixed electrical loads efficiently. Its built-in real-time clock (RTC) supports time-based control, and the 20 KB memory (10 KB program + 10 KB data) accommodates recipes and log data. Designed for panel or DIN-rail mounting, this controller fits neatly into existing control cabinets.
Technical Specifications
Below are the key specifications for the Allen-Bradley 1766-L32BXB, sourced directly from the manufacturer's data:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1766-L32BXB |
| Module Type |
Controller |
| Product Family |
MicroLogix |
| Series |
MicroLogix 1400 |
| Inputs |
12 Digital Fast 24V DC, 8 Digital Normal 24V DC, 2 Analog |
| Outputs |
6 Relay, 3 Fast 24V DC, 3 Normal 24V DC |
| Number of I/O |
32 points |
| Operating Power |
24V DC |
| Memory |
20 KB |
| Communication |
EtherNet/IP |
| Operating Frequency |
47-63 Hz |
| Power Consumption |
50W; 7.5W (with no 1762 expansion I/O) |
| Power Supply Inrush Current (24V DC) |
15 A for 20 ms |
| Communication Ports |
1 RS232/RS485, 1 Ethernet, 1 RS232 |
| Supported Protocols |
Serial: DF1, ASCII, MODBUS RTU, DNP3, DH485; Ethernet: Ethernet/IP, DNP3, MODBUS TCP/IP |
| Shipping Weight |
2 lbs |
| Dimensions |
90 x 180 x 87 mm (3.5 x 7.087 x 3.43 in) |
| Mounting |
Panel Mounting / DIN Rail |
These specifications confirm the 1766-L32BXB is a robust controller suitable for a wide range of industrial tasks.
Key Features & Benefits
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Versatile I/O Configuration: Twelve fast 24V DC inputs, eight normal 24V DC inputs, six relay outputs, three fast DC outputs, and three normal DC outputs provide flexibility for mixed-load applications.
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Enhanced Communication: The Ethernet port supports EtherNet/IP, DNP3, and MODBUS TCP/IP, while serial ports handle DF1, ASCII, MODBUS RTU, DNP3, and DH485 protocols.
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Built-in Real-Time Clock: Enables time-based control for applications like HVAC and building management systems.
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High-Speed Counting: Supports up to six 100 kHz high-speed counters on DC controllers, ideal for counting and totalizing tasks.
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Memory Capacity: 20 KB total memory (10 KB program + 10 KB data) supports recipe and log data storage.
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Flexible Mounting: Panel or DIN-rail mounting options simplify installation in existing cabinets.
Industry Applications
The 1766-L32BXB excels in applications that require mixed discrete I/O and reliable communication. Typical use cases include:
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HVAC and Building Management: The built-in RTC and time-based control logic make it ideal for scheduling equipment setpoints and automatic mode changes.
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Water and Wastewater Treatment: Its robust I/O and protocol support (DNP3, MODBUS) enable seamless integration with SCADA systems.
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Simple Motion Control: The high-speed outputs and counters support pulse train output (PTO) and PWM for basic motion applications.
In each scenario, the 1766-L32BXB delivers dependable performance, reducing downtime and improving process efficiency.
Installation & Setup
Mount the 1766-L32BXB on a standard DIN rail or directly to a panel using the integrated mounting slots. Ensure the enclosure is clean and dry, and that circuits do not exceed Over Voltage Category II. Connect 24V DC power to the designated terminals, observing correct polarity. For communication wiring, use the isolated RS-232/485 port for noisy environments and the Ethernet port for network integration. Configure the controller using Rockwell Automation's programming software, setting IP address and protocol parameters as needed.
Maintenance & Reliability
Regular inspection of the controller's connections and environment is recommended. Check for loose wiring, dust accumulation, and proper ventilation. The battery-backed RAM ensures memory retention during power loss; replace the battery every 2-3 years or as indicated by the controller status. Avoid exposure to excessive vibration, moisture, or extreme temperatures to maximize service life.
Compatibility & Integration
The 1766-L32BXB integrates seamlessly with other MicroLogix 1400 components and supports expansion via 1762 I/O modules. Its Ethernet/IP capability allows direct connection to Rockwell Automation PLCs and HMIs, while serial protocols like Modbus RTU and DH485 enable communication with legacy devices. This versatility makes it a valuable addition to existing control systems.
Buying Guide
Before purchasing, verify that the 1766-L32BXB meets your I/O count and communication requirements. Confirm the operating power (24V DC) and mounting preference. For genuine, ready-to-ship parts, PLC Source PRO offers reliable sourcing and fast delivery. Ensure you order the correct part number to avoid compatibility issues.