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Allen-Bradley 1761-L20BWB-5A MicroLogix 1000 Programmable Controller
Allen-Bradley 1761-L20BWB-5A MicroLogix 1000 Programmable Controller
Brand/Manufacturer: Allen-Bradley
Order Number: 1761-L20BWB-5A
Type: Programmable Logic Controllers
Country of Origin: USA
Condition: Original Brand
Lead Time: Available in stock
Payment Term: 100% TT In Advance
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Description
The Allen-Bradley 1761-L20BWB-5A is a compact fixed-configuration Programmable Logic Controller (PLC) from the MicroLogix 1000 product line. Powered directly by a 24 VDC main power supply, it integrates twenty I/O points—comprising twelve 24 VDC discrete inputs, eight relay contact outputs, four analog inputs, and one analog output—into a single base chassis for small-scale industrial automation applications.
DC Power Supply and Integrated I/O Architecture
Designed for 24 VDC control systems, the controller consumes approximately 7 Watts of real power at nominal line voltage. The discrete section features twelve 24 VDC sinking/sourcing inputs and eight electromechanical relay outputs capable of switching 24 to 125 VDC or 0 to 240 VAC load circuits. Built-in analog channels support differential voltage (-10.5 to +10.5 VDC) and current (-21 to +21 mA) signals, alongside a single analog output delivering 0 to 10 VDC or 4 to 20 mA for process variable regulation.
Program Processing and Communication Interfaces
The unit incorporates an internal 1K EEPROM memory supporting up to 737 instruction words and 437 data table words for executive control programs, counters, and timers. Communication is established through an integrated RS-232 port supporting DF1 point-to-point and network protocols (DH-485, DeviceNet, or EtherNet/IP via external converters). An integrated Master Control Relay (MCR) circuit provides hardwired safety shutdown capability across output groups.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1761-L20BWB-5A |
| Brand | Allen-Bradley |
| Product Type | Programmable Logic Controller (PLC) |
| Product Line | MicroLogix 1000 |
| Main Supply Voltage | 24 VDC |
| Real Power Consumption | 7 W at 24 VDC |
| Digital Inputs | 12 points (24 VDC, Sink/Source) |
| Digital Outputs | 8 points (Relay contacts) |
| Analog Inputs | 4 channels (-10.5 to +10.5 VDC / -21 to +21 mA) |
| Analog Output | 1 channel (0 to 10 VDC / 4 to 20 mA) |
| Memory Capacity | 1K EEPROM (737 instruction words, 437 data words) |
| Communication Port | RS-232 (DF1 Protocol) |
| Isolation Rating | 1500 VAC |
| Operating Temperature | 0 °C to +55 °C |
| Unit Weight | 0.79 kg (1.75 lbs) |
| Lifecycle Status | Discontinued by Manufacturer |
Grounding and Wiring Conditions
When installing the 1761-L20BWB-5A, note that the 24 VDC user supply ground terminal and the module chassis ground screw are connected internally. Installers must connect the chassis ground screw directly to a low-impedance industrial earth ground prior to energizing the controller. Terminal block connections accommodate #14 to #22 AWG solid wires or #16 to #22 AWG stranded wires.
Frequently Asked Questions
Q: What is the main operational difference between the 1761-L20BWB-5A and the 1761-L20BWA-5A? A: The 1761-L20BWB-5A is powered by a 24 VDC main power supply, whereas the 1761-L20BWA-5A requires a 120/240 VAC main power source. Both units utilize 24 VDC digital inputs and share identical analog channel layouts.
Q: Are the 24 VDC user supply ground and chassis ground isolated on this controller? A: No, the 24 VDC user power input ground and the chassis ground terminal are connected internally on the 1761-L20BWB-5A.
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Testimonials
Fast Delivery, Excellent Quality
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
Reliable Partner for Original Parts
Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
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Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
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Professional Service with After-Sales Support"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
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- Emily Brown
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We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
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We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson