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Help Center1771-ASB ALLEN-BRADLEY PLC-5 Remote I/O Adapter Module 1771ASB
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As a trusted supplier of industrial automation components, Rossonix Co., Limited (established in 2011, with an annual export value of US$5–10 million) is proud to offer the Allen-Bradley 1771-ASB Remote I/O Adapter Module. This critical module enables seamless communication between a PLC-5 processor and remote I/O racks, ensuring reliable data exchange in demanding industrial environments. With our extensive experience serving markets across North America, Europe, and Asia, we guarantee genuine quality and professional support for every order.
The 1771-ASB is designed to interface with Allen-Bradley’s 1771 I/O chassis, converting remote I/O data into a format that PLC-5 controllers can process. It supports up to 16 logical racks and can handle 32 I/O groups per rack, making it suitable for medium to large-scale distributed control systems. Its rugged construction and industrial-grade components ensure long service life even in harsh conditions.
Key Features & Customer Benefits
Plug-and-Play Integration: Simply install the module into any slot of a 1771 chassis; no complex wiring or configuration tools are required for basic operation.
High Communication Speed: Supports Remote I/O scan rates up to 57.6 kbps, ensuring real-time data transfer for time-critical processes.
Extended Distance Capability: With proper cabling, the remote I/O link can span up to 10,000 feet (3,000 meters), allowing flexible placement of I/O racks far from the controller.
Built-in Diagnostics: LED indicators for power, communication status, and fault conditions simplify troubleshooting and reduce downtime.
Backward Compatibility: Works with all Allen-Bradley PLC-5 processors (e.g., 1785-Lxx series) and legacy 1771 I/O modules.
Robust Design: Rated for 0°C to 60°C operation; compliant with industrial electromagnetic compatibility (EMC) standards.
Technical Specifications
| Parameter | Value |
| Part Number | 1771-ASB |
| Communication Protocol | Remote I/O (RIO) |
| Max Racks Supported | 16 logical racks |
| Max I/O per Rack | 32 groups (up to 32 points per group) |
| Power Consumption | 5V DC @ 0.5A (typical) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Dimensions (HxWxD) | 4.5" x 1.5" x 6.0" (114 x 38 x 152 mm) |
| Weight | 0.5 kg (1.1 lbs) |
| Certifications | ISO9001, ISO9000 |
Advanced Technical Insights
The 1771-ASB acts as the liaison between the PLC-5 processor and remote I/O racks. It supports both single-cable and redundant-cable configurations (cable type: Belden 9463 or equivalent). The module can be configured as a scanner or adapter depending on system architecture, though the 1771-ASB specifically functions as an adapter on the remote side. It uses the Allen-Bradley Remote I/O protocol, which employs a token-passing scheme for deterministic communication. Each remote rack can contain up to 8 I/O modules, and the adapter can map up to 32 logical racks in a multi-drop topology. This makes it ideal for applications requiring distributed I/O across large facilities, such as oil refineries, water treatment plants, and automotive assembly lines.
In addition to standard I/O, the 1771-ASB supports block transfer for analog and specialized modules (e.g., thermocouple, RTD, high-speed counter). The module automatically handles block transfer read/write requests, reducing processor overhead. Diagnostic LEDs provide real-time status of POWER, COMM, and FAULT conditions, enabling quick identification of communication errors or hardware failures. For advanced troubleshooting, the module can be configured using Allen-Bradley programming software (e.g., RSLogix 5) to adjust parameters such as rack size, starting rack number, and communication timeout.
Why Choose Rossonix for Your Automation Needs?
Since 2011, Rossonix Co., Limited has been a reliable partner for industrial automation components worldwide. Our annual export value exceeds US$5–10 million, with products shipped to over 10 major markets including North America, Europe, Oceania, and the Middle East. We maintain a dedicated overseas office and a professional team of 11–50 employees to ensure timely quoting, secure packaging, and fast delivery from our ports in Shenzhen, Hong Kong, and Europe.
Every 1771-ASB module we supply undergoes rigorous inspection to confirm authenticity and functionality. We offer a 12-month warranty against manufacturing defects and provide technical support to assist with installation and configuration. Our ISO9001 and ISO9000 certifications underscore our commitment to quality management. Whether you need a single module for a legacy system replacement or bulk units for a new project, Rossonix delivers genuine Allen-Bradley products at competitive prices.
Don’t let obsolete components slow down your production. Contact us today for a quote or technical consultation. Our team is ready to help you optimize your PLC-5 network with the reliable 1771-ASB Remote I/O Adapter Module.
Frequently Asked Questions
Q1: Is the 1771-ASB compatible with ControlNet or DeviceNet?
A: No, the 1771-ASB uses the Allen-Bradley Remote I/O (RIO) protocol, which is different from ControlNet or DeviceNet. For those networks, you would need corresponding adapters like 1771-CN or 1771-DN.
Q2: Can I use this module with a PLC-5/20 processor?
A: Yes, the 1771-ASB is compatible with all PLC-5 processors that support remote I/O, including the 1785-L20B, L30B, L40B, L60B, and later models.
Q3: How many remote racks can I connect to one 1771-ASB?
A: Each 1771-ASB can handle up to 16 logical racks. However, the total number also depends on the processor’s capacity and the cable length.
Q4: What is the maximum cable length for the remote I/O link?
A: With proper cabling (Belden 9463), the maximum distance is 10,000 feet (3,000 meters). For shorter distances, standard shielded twisted-pair cable can be used.
Q5: Does the module come with a warranty?
A: Yes, all modules sold by Rossonix include a 12-month warranty against defects. Extended warranty options are available upon request.
Q6: How do I configure the rack address on the 1771-ASB?
A: The address is set via hardware dip switches on the module. Refer to the user manual for switch position mapping; configuration can also be done via software using RSLogix 5.
Q7: Can the 1771-ASB be used with Series A and Series B 1771 chassis?
A: Yes, it is compatible with both Series A and Series B 1771 chassis. Ensure the backplane provides 5V DC power.
Q8: Is the module new or refurbished?
A: We offer both new and professionally refurbished units. Please specify your preference when ordering. All refurbished modules are tested and guaranteed to meet original specifications.
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