Overview
The Allen-Bradley 1761-L10BXB MicroLogix 1000 is a compact programmable logic controller designed for micro and small automation applications. This 10-point controller delivers reliable performance in distributed control environments where space constraints and cost efficiency are critical. The controller’s small form factor enables installation in confined panel spaces while maintaining robust digital I/O capabilities and RS232 communication support.
Key Features
- 10 Digital I/O Points: 6 discrete 24VDC inputs, 2 relay contact outputs, and 2 sourcing MOSFET outputs for mixed electrical load compatibility
- Compact Design: Supports DIN rail or panel mounting in space-restricted automation cabinets
- Multi-Language Programming: Supports up to 5 different programming languages for flexible development workflows
- High-Speed Processing: Program scan time of 2ms and I/O scan time of 0.21ms for responsive control
- RS232 Communication: Integrated 8-pin mini DIN port supporting DF1, MODBUS slave, DH-485, DeviceNet, and EtherNet/IP protocols via external interface converters
- Instruction Set: Over 65 instructions enabling high-speed counters, sequencers, and shift register operations
Technical Specifications
The controller operates on a nominal 24VDC power supply with an operating range of 20.4–26.4VDC, drawing 5W input power. Its memory configuration includes 1K EEPROM with 737 instruction words and 437 data words of allocation. Relay outputs support 5–125VDC and 5–264VAC loads with continuous current ratings of 2.0A at 24VDC, 1.0A at 125VDC, and 2.5A at 120/240VAC. MOSFET outputs source 1.5A at 30°C, derated to 1.0A at 55°C operating temperature. The unit maintains 1500V AC isolation voltage and integrates IP20 enclosure protection for industrial environments.
Typical Applications
- Bottling and packaging machinery control
- Distributed machine automation in manufacturing plants
- Process sequence management in food and beverage production
- Conveyor belt control and interlocking systems
- Equipment startup/shutdown and safety interlocking circuits
- Sensor-based counting and sorting applications
Compatibility & Replacements
The 1761-L10BXB integrates with Rockwell Automation’s Studio 5000 and RSLogix Micro software platforms. Communication expansion is supported through Allen-Bradley interface converters including 1761-NET-ENI for Ethernet, 1761-NET-DNI for DeviceNet, and 1761-NET-AIC for DH-485 networking. Similar controllers in the MicroLogix 1000 family (1761-L10BWB, 1761-L10AXB) offer alternative output configurations. This controller is suited as a replacement for obsolete Rockwell ControlLogix or PLC-5 distributed I/O modules in retrofit applications where compact, 24VDC-only operation is acceptable.
