1761-L32BBB | Allen-Bradley MicroLogix 1000 Logic Controller

The Allen-Bradley 1761-L32BBB is a compact fixed-configuration programmable logic controller belonging to the MicroLogix 1000 family. This unit integrates 20 digital DC inputs, 10 solid-state MOSFET sourcing outputs, and 2 relay outputs, operating on a 24 VDC power supply to manage dedicated machine control tasks.

Technical Specifications

Controller Architecture and I/O Configuration

The 1761-L32BBB features a fixed I/O density designed for small-scale automation applications where panel space is constrained. It combines high-speed DC sinking inputs with a hybrid output structure comprising fast-switching solid-state MOSFET channels alongside electromechanical relay contacts. This configuration allows the controller to interface directly with low-voltage sensors, solid-state actuators, and independent load circuits.

Power Requirements and Operational Conditions

The controller operates on an external 24 VDC power source, which also powers the internal logic circuitry and field-side input points. The unit's embedded layout requires appropriate dc power regulation and fusing to protect the internal circuitry against voltage spikes and transient currents common in industrial control environments.

Frequently Asked Questions

Q: What power supply voltage does the 1761-L32BBB require? A: The controller requires an external 24 VDC power supply for operation and I/O coordination.

Q: What type of outputs are equipped on this controller? A: It features a hybrid output configuration consisting of 10 MOSFET sourcing outputs and 2 relay outputs.

Q: How many total digital inputs does the controller provide? A: The unit provides 20 digital 24 VDC input channels.