When you're wiring a compact control panel, the choice between a brick-style PLC and a modular rack often comes down to I/O count and power supply. If your machine needs a small number of discrete inputs and outputs, a unit like the Allen-Bradley MicroLogix 1000 controller module could be the fit. But is the 1761-L32BWB variant the right one? Let's break down what this listing tells you.
Quick verdict
If your application needs a 24V DC PLC with 20 digital inputs and 12 relay outputs, the Allen-Bradley MicroLogix 1000 1761-L32BWB is a compact brick controller that lists at USD 299.00. It comes described as unused and in perfect condition, though it's an open-box unit. The built-in RS-232 port and a single high-speed counter extend its usefulness beyond basic relay replacement.
What stands out from the listed details
The module offers a total of 32 I/O points: 20 sinking/sourcing 24V DC inputs and 12 relay outputs. That's enough for a small packaging machine, a simple conveyor, or a standalone process skid. The relay outputs can switch common AC/DC loads, and the inputs accept a wide 14-30V DC on-state range, making the controller flexible for sensors and switches.
Power input is 24V DC with an operating range of 20.4 to 26.4V DC, so it can run from a standard industrial power supply. Power consumption is 7W max, with a 30A inrush for 4ms - useful to know when sizing the supply. The 1KB EEPROM memory holds roughly 737 instruction words and 437 data words, which suits small ladder programs rather than dense motion or complex math.
The RS-232 communication port allows connection to a PC or HMI, and the built-in high-speed counter runs at 6.6 kHz - helpful for simple speed monitoring or counting pulses from a rotary encoder. These are the details that matter when you're deciding between this and a bare-logic relay.
Who it suits
If you're replacing a relay panel or building a small control system with moderate digital I/O, this PLC fits well. The 24V DC power input matches the majority of sensor and solenoid supplies in modern cabinets. The relay outputs give you direct switching capability for contactors, lamps, and small valves without needing external interface modules. It's also appropriate for maintenance teams already familiar with Rockwell Automation's MicroLogix family.
Meaningful trade-offs
The memory is limited to 1KB EEPROM, so you'll need to keep programs compact. There's no built-in Ethernet or analog I/O in this listing; you're getting just the processor with digital I/O and relay outputs. The high-speed counter is a single channel, so multi-axis encoder counting isn't in scope.
The price of USD 299.00 is for an unused, open-box unit. That means you may not have the original factory seal, but the description states it's in perfect condition, ready to be used. As with any open-box industrial gear, you'll want to confirm the exact state and included accessories before ordering, but the listing is clear about the condition.
Bottom line
For a compact 24V DC PLC with 32 I/O points, RS-232, and a high-speed counter, the Allen-Bradley 1761-L32BWB at USD 299.00 is a solid match for small machines and retrofit projects. Just be ready to work within the 1KB program memory and plan for the open-box condition.
Product note
UNUSED-Allen-Bradley Micrologix 1000 Controller Processor PLC Module 1761-L32BWB
Choose this module if you need a ready-to-use compact PLC with a mix of 20 DC inputs and 12 relay outputs, all in one brick. The limitation to keep in mind is the 1KB EEPROM memory, which restricts how much logic you can load into the controller.
