Allen Bradley 1771-ASB B Remote I/O Adapter Module Series B

The Allen-Bradley 1771-ASB B Remote I/O Adapter Module (Series B) is a component in the Allen-Bradley 1771 series of programmable logic controller (PLC) systems. This module is designed to enable communication between the PLC and remote I/O (Input/Output) devices in distributed control systems, typically in large-scale automation applications. Here’s a detailed breakdown of its features and specifications:

Key Features:

1. Model: 1771-ASB B Remote I/O Adapter Module (Series B)

   • Part of the Allen-Bradley 1771 I/O family, widely used in industrial control systems.

2. Function: Remote I/O Communication

   • The 1771-ASB serves as an adapter module to allow remote I/O communication between the PLC and remote I/O devices. It connects the PLC processor to a network of distributed I/O modules over a communication link.
   • It is typically used to extend the range of a PLC system, enabling it to control devices that are physically far away from the central PLC, reducing wiring complexity and costs.

3. Compatibility:

   • The 1771-ASB module is compatible with Allen-Bradley PLC-5 series controllers and their associated I/O systems.
   • It supports the Allen-Bradley Remote I/O network, enabling multiple devices to be connected to the same network, streamlining communication.

4. Network Protocol:

   • The 1771-ASB module supports the Remote I/O (RIO) protocol, which is a robust, fast communication standard designed for industrial environments.
   • It facilitates data exchange between the PLC and remote I/O devices in real-time, typically through a data bus or fiber optic link.

5. Data Transfer:

   • The 1771-ASB module handles high-speed data transfer, ensuring that input data from remote devices (sensors, switches, etc.) is communicated to the central controller without significant delay.
   • It also transmits output data from the PLC to remote actuators (motors, valves, relays, etc.).

6. Addressing and Configuration:

   • The module allows for multiple I/O devices to be addressed and configured as part of the same control system.
   • Remote I/O devices can be connected to the 1771-ASB module using standard I/O racks and cables.

7. Physical Characteristics:

   • Typically, the 1771-ASB is a modular, rack-mounted unit. It plugs into the I/O chassis and connects to the PLC processor via a communication bus.
   • It features LED indicators for monitoring the health and status of the communication link and other diagnostics.

8. Series B Updates:

   • The Series B version of the 1771-ASB adapter may include enhanced communication capabilities, improved processing speeds, and better integration with newer hardware or networks compared to earlier versions of the module.

Applications:

• Industrial Automation: The 1771-ASB is widely used in factory automation, process control, and other industrial settings where multiple I/O devices need to be controlled remotely from a central PLC.
• Distributed Control Systems (DCS): Ideal for applications where the PLC needs to monitor and control devices spread over a large physical area (e.g., manufacturing plants, oil refineries, and water treatment facilities).
• Remote Sensing and Actuation: Used in systems with distributed sensors and actuators, such as temperature sensors, pressure switches, and motor controllers.