Allen Bradley 1771-SPI /C SPI Protocol Interface Module

Allen-Bradley 1771-SPI/C SPI Protocol Interface Module

The Allen-Bradley 1771-SPI/C SPI Protocol Interface Module is engineered to facilitate seamless communication between PLC-5 processors and SPI-compatible peripheral devices. This module serves as a network master, efficiently coordinating data exchange and enhancing the integration of various automation components.

Key Features

• Network Master Functionality: Acts as the central controller, managing data flow between the PLC-5 processor and up to 32 connected slave devices on the SPI network.
• RS-485 Multi-Drop Serial Port: Utilizes an RS-485 interface for reliable, multi-drop serial communication, supporting baud rates ranging from 1,200 to 19,200 bits per second.
• Flexible Data Handling: Supports asynchronous, half-duplex communication and employs IEEE floating-point numbers for precise data representation.
• Efficient Configuration: Stores configuration information for each connected device and returns configuration status to the PLC-5 processor, streamlining system setup and monitoring.
• Block Data Transfer Protocol: Implements block data transfer protocols, ensuring efficient and organized data exchange between the processor and peripheral devices.

Technical Specifications

• Backplane Current: Draws 1.3 A at 5 V DC.
• Device Support: Accommodates up to 32 devices on the SPI link.
• Communication Speed: Operates at speeds between 1,200 and 19,200 bits per second, with 1,200 bits per second required and 9,600 bits per second common.
• Logical Device Addresses: Supports over 128 possible logical device addresses.
• Environmental Conditions: Operates within a temperature range of 0 to 60°C and a relative humidity of 5-95% non-condensing.

Applications

The 1771-SPI/C module is ideal for applications requiring robust communication between PLC-5 processors and SPI-compatible devices, such as hot runner temperature controllers and material dryers. Its ability to manage multiple devices and facilitate efficient data exchange makes it a valuable component in complex automation systems.

Installation and Configuration

Designed for easy integration, the module fits into any 1771 I/O chassis slot and interfaces electronically through the RS-485 multi-drop serial port using a Field Wiring Arm Connector. Configuration involves mapping data tables and programming block transfer instructions to ensure proper communication with connected devices.

By incorporating the Allen-Bradley 1771-SPI/C SPI Protocol Interface Module into your automation setup, you can achieve enhanced communication capabilities, streamlined data management, and improved overall system performance.