Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1761-L32AAA/A (MicroLogix 1000) |
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Product Status | Discontinued (Legacy Product) |
| Total I/O Points | 32 Points |
| Digital Inputs | 20 × 120V AC (79–132V AC, 47–63 Hz) |
| Digital Outputs | 10 × Triac (AC) + 2 × Relay (Dry Contact) |
| Relay Output Rating | 2A @ 24V DC / 120V AC (per point) |
| Power Supply | 120/240V AC (85–264V AC, 47–63 Hz) |
| User Memory | 1 KB EEPROM (Non‑volatile, no battery needed) |
| Communication Port | 1 × RS‑232 (DF1 Full/Half Duplex, DH‑485) |
| Programming Software | RSLogix 500, Connected Components Workbench (CCW) |
| Operating Temperature | 0 °C to 55 °C (32 °F to 131 °F) |
| Dimensions (H×W×D) | 70 mm × 170 mm × 87 mm (approx.) |
| Mounting | DIN Rail or Panel Mount |
Main Features and Advantages
Fixed I/O Architecture for Rapid Deployment: Unlike modular PLCs, the 1761‑L32AAA comes with a fixed set of 32 I/O points that cannot be expanded. This limitation is also its strength in simple applications—it reduces hardware selection time, eliminates the need for configuring I/O modules, and simplifies wiring. The inclusion of both Triac outputs (for high‑speed, wear‑free AC switching) and relay outputs (for flexible voltage control) provides a balanced solution for mixed loads without requiring external interposing relays.Cost‑Effective AC Integration: This controller is optimized for environments where the control circuitry runs on 120V AC. The inputs accept 120V AC directly from pushbuttons, limit switches, and selector switches, eliminating the need for external AC‑to‑DC conversion modules. This “direct‑connect” capability significantly reduces the bill of materials and cabinet space for small machines and control panels that operate on standard line voltage.Robust Legacy Platform: Despite being discontinued, the MicroLogix 1000 remains a workhorse due to its non‑volatile EEPROM memory (no battery maintenance) and rugged design. It supports a wide range of ladder logic instructions, including timers, counters, and basic math, making it suitable for straightforward sequential control and relay replacement projects that do not require advanced networking or data handling.
Application Field
The 1761‑L32AAA is primarily used in small‑scale industrial automation where simplicity and direct AC voltage compatibility are key. In material handling, it controls small conveyors, sorting gates, and packaging machine feeders, utilizing its relay outputs for motor contactors and Triac outputs for indicator lamps. For commercial HVAC and building management, it serves as a standalone unit for controlling pumps, fans, and damper actuators, taking advantage of the 120V AC I/O to interface directly with thermostats and pressure switches.In manufacturing, it is commonly found in standalone workstations, jigs, and test fixtures that require basic sequencing and interlocking. It is also a popular choice for modernizing old relay‑based control panels in water treatment plants and small assembly lines, as the fixed I/O structure closely mirrors the discrete nature of relay logic, simplifying the migration path without the complexity of a modular system.
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