Product Overview

The Allen-Bradley 1761-L32AAA/A​ is a MicroLogix 1000 Series fixed I/O programmable logic controller (PLC) manufactured by Rockwell Automation, designed as a compact, cost-effective, all-in-one control solution for small standalone machines and process skids. Unlike modular PLC systems, the Allen-Bradley 1761-L32AAA/A​ integrates the processor, power supply (accepting 100–240V AC mains directly), and 32 points of digital I/O onto a single DIN-rail-mountable unit—eliminating the need for separate power modules, expansion racks, or external power wiring for the I/O commons. The unit provides twenty (20) 120V AC discrete inputs, ten (10) 120V AC triac (solid-state) outputs, and two (2) mechanically isolated relay outputs (SPDT, rated for AC/DC load switching), making it well suited to applications where both AC-controlled loads (pilot lights, small contactors, solenoid valves) and mixed AC/DC relay-driven devices coexist.Program memory on the Allen-Bradley 1761-L32AAA/A​ consists of 1 Kword (737 instructions / 437 data words) of EEPROM-based non-volatile user memory, sufficient for typical ladder logic programs involving sequencing, timing, counting, simple math, and bit manipulation. The controller communicates via a built-in RS-232 (DF1 protocol, mini-DIN 8-pin) port for programming with RSLogix 500 / RSLogix Micro Starter Lite and for peer-to-peer messaging. Through an optional 1761-NET-AIC Advanced Interface Converter, the Allen-Bradley 1761-L32AAA/A​ can also participate in a DH-485 network for multi-drop communication with PanelView terminals, other MicroLogix controllers, or SLC 500 processors. The “/A” revision denotes the standard hardware production version of this AC-powered variant.The Allen-Bradley 1761-L32AAA/A​ occupies a minimal footprint—approximately 110 mm wide × 90 mm high × 80 mm deep—and mounts directly on a 35 mm DIN rail or via panel screws, with clearly labeled screw-clamp terminals for field wiring. Its built-in real-time clock (in later firmware), Master Control Relay (MCR) safety function support, and forced-I/O capability during commissioning make it a practical choice for OEM machine builders and facility maintenance teams maintaining legacy small-machine controls. By consolidating power, processing, and I/O in one unit, the Allen-Bradley 1761-L32AAA/A​ reduces panel space, component count, and wiring labor while delivering the proven Rockwell ladder-logic programming environment familiar to thousands of automation professionals worldwide.

Technical Specifications

Product Model | 1761-L32AAA/AManufacturer | Rockwell Automation / Allen-BradleyProduct Type | MicroLogix 1000 Fixed I/O Programmable Logic Controller (AC-Powered)Number of Digital Inputs | 20 (120V AC, 79–132V AC range, 47–63 Hz)Number of Digital Outputs | 12 total: 10 Triac (120V AC, 0.5A/pt) + 2 Relay (SPDT, 2A @ 120/240V AC / 30V DC)User Program Memory | 1 Kword EEPROM (737 instruction words / 437 data words), non-volatileData File Capacity | Timers/Counters: 128 each; Integer: 256; Bit: 4096; etc. (per MicroLogix 1000 memory map)Built-in Communication Port | 1 × RS-232 (DF1 half-duplex, mini-DIN 8-pin), 300–19200 bps; supports DH-485 via 1761-NET-AICSupply Voltage (Controller Power) | 100–240V AC (50/60 Hz), typical 120V AC; inrush < 15 A for 4 msPower Consumption (Controller Only) | Approx. 30 VA @ 120V ACInput Threshold (ON / OFF) | ON: 79V AC min; OFF: 20V AC max @ 60 HzTriac Output Leakage | Max 2.5 mA @ 132V ACRelay Output Contact Rating | 2 A resistive @ 120/240V AC; 2 A @ 30V DCScan Time (Typical) | 1–10 ms typical for average program (depends on instruction mix)Real-Time Clock | Yes (firmware dependent, typically present in /A rev)Indicators | PWR (power), RUN, FAULT, FORCE, I/O point LEDs per channel groupMounting Method | 35 mm DIN rail (EN 60715) or panel mount with screwsOperating Temperature | 0 °C to +55 °C (32 °F to 131 °F)Storage Temperature | –40 °C to +85 °CRelative Humidity | 5 % to 95 % non-condensingDimensions (W × H × D) | 110 × 90 × 80 mm (4.33 × 3.54 × 3.15 in.)Wire Size (Screw Terminals) | 14–22 AWG solid or stranded copperCertifications | cULus Listed, CE marked, C-Tick, Class I Div 2 (with proper enclosure)Programming Software | RSLogix 500 / RSLogix Micro Starter Lite (free from Rockwell)