Product Overview
The Allen-Bradley 1766-L32AWAA is a compact Programmable Logic Controller (PLC) from the MicroLogix 1400 family, engineered for micro and small-scale automation. This controller integrates digital and analog I/O, multiple communication ports, and a built-in real-time clock, making it a versatile solution for manual or automatic control systems.
With 120VAC / 240VAC external supply, the 1766-L32AWAA delivers reliable performance in industrial environments. Its embedded I/O includes twenty (20) 120VAC discrete inputs, two (2) voltage analog inputs, twelve (12) relay outputs, and two (2) voltage output channels—offering a balanced mix for various applications.
Technical Specifications
Below are the key technical specifications for the Allen-Bradley 1766-L32AWAA:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Part Number |
1766-L32AWAA |
| Product Type |
MicroLogix 1400 Controller |
| Number of I/O |
32 |
| Digital Inputs |
20 x 120VAC (79-132VAC range) |
| Analog Inputs |
2 x Voltage (0…10.0VDC) |
| Relay Outputs |
12 (operating range: 5-125VDC / 5-264VAC) |
| Analog Outputs |
2 x Voltage |
| Operating Frequency |
47-63 Hz |
| Power Consumption |
100 VA |
| Inrush Current (120VAC) |
25 A for 8 ms |
| Inrush Current (240VAC) |
40 A for 4 ms |
| Communication Ports |
1 isolated RS232/RS485 combo, 1 non-isolated RS232, 1 Ethernet |
| Supported Protocols |
Serial: DF1, ASCII, MODBUS RTU, DNP3, DH485; Ethernet: Ethernet I/P, DNP3, MODBUS TCP/IP |
| Memory |
20 KB |
| Built-in RTC |
Yes |
| UPC |
10612598518125 |
Real-World Applications
The 1766-L32AWAA excels in applications requiring mixed discrete and analog control. Common use cases include:
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Packaging machinery – managing conveyor systems with relay outputs and monitoring sensors via 120VAC inputs.
-
HVAC control – using analog inputs for temperature sensors and relay outputs for fan or damper actuation.
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Water treatment – controlling pumps and valves with the 12 relay outputs, while the Ethernet port enables remote SCADA monitoring.
For example, in a small bottling line, the 1766-L32AWAA can coordinate filling and capping stations, using its 20 digital inputs to track limit switches and its analog channels to adjust flow rates—all while communicating status via Modbus TCP/IP to a central HMI.
Installation & Setup Guidance
Mount the 1766-L32AWAA on a standard DIN rail or panel using the integrated slots. Ensure the enclosure is open and the environment is clean and dry, with circuits not exceeding Over Voltage Category II. Connect the 120/240VAC supply to the designated terminals, observing proper grounding. For serial communication, use the 9-pin sub-D connector for RS232 and the 8-pin mini-DIN for RS485. The Ethernet port accepts an RJ45 cable for network integration. Always verify input voltage ranges before powering up.
Maintenance & Reliability
Routine inspection of the 1766-L32AWAA involves checking for dust accumulation on the enclosure and ensuring all connectors remain tight. The battery-backed RAM preserves user programs during power loss; replace the battery every 2-3 years as part of preventive maintenance. Operating within the specified 47-63 Hz frequency range and keeping ambient temperatures within limits ensures long-term reliability. Since the controller has no moving parts, wear is minimal, reducing downtime and maintenance costs—a key factor in total cost of ownership.
Compatibility & Integration
The 1766-L32AWAA supports up to seven (7) 1762 expansion I/O modules, allowing you to scale I/O counts as needed. Its communication ports support multiple protocols, making integration straightforward with existing systems. Use the Ethernet port for EtherNet/IP, DNP3, or Modbus TCP/IP to connect to HMIs, SCADA, or other PLCs. The serial ports handle DF1, ASCII, Modbus RTU, DNP3, and DH485, ensuring compatibility with legacy devices. This flexibility reduces integration effort and future-proofs your installation.
Buying Guide
Before purchasing the 1766-L32AWAA, confirm that your application requires 120VAC inputs and relay outputs, and that the 20 KB memory is sufficient for your program. Verify the availability of 1762 expansion modules if you anticipate future I/O expansion. PLC Source PRO offers genuine Allen-Bradley products with reliable sourcing and competitive pricing, ensuring you receive authentic components for your automation projects.