Allen Bradley 1771-DA /A ASCII I/O Module

Allen-Bradley 1771-DA ASCII I/O Module

The Allen-Bradley 1771-DA ASCII I/O Module is designed to facilitate seamless data exchange between ASCII devices and programmable controller processors. This module enables the transfer of data through I/O scans, supporting both input and output operations with various ASCII-compatible equipment.

Key Features

• Communication Interfaces: Supports RS-232-C, 20mA current loop, and A-B Long Line interfaces, ensuring compatibility with a wide range of ASCII devices.
• Selectable Baud Rates: Offers user-selectable communication rates of 110, 300, 600, 1200, 2400, 4800, and 9600 baud, providing flexibility to match device requirements.
• Buffer Memory: Equipped with a 1.5K word (3K byte) buffer memory to efficiently handle data transfers.
• Operational Modes: Features two modes of operation:
  • Data Mode: Allows the transfer of ASCII, BCD, or hexadecimal characters to the processor data table.
  • Report Generation Mode: Enables the inclusion of BCD values within ASCII character strings, facilitating message generation.
• Backplane Current Requirement: Draws a maximum of 1.3 Amps from the backplane, ensuring efficient power usage.
• Environmental Tolerance: Operates within a temperature range of 0°C to 60°C (32°F to 140°F) and can be stored between -40°C and 85°C (-40°F to 185°F), accommodating various industrial environments.
• Module Dimensions: Measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm) and weighs approximately 1.9 lbs (0.9 kg), facilitating easy integration into existing systems.

Applications

The 1771-DA module is versatile and can interface with a variety of ASCII devices, including:

• Bar code readers for part recognition and inventory control.
• Keypads for data entry and modification.
• Dot-matrix displays, terminals, or printers for displaying warnings, diagnostic messages, or printing production reports.
• Intelligent data terminals and computers for bidirectional data exchange and process monitoring.

Installation and Configuration

The 1771-DA module is designed for installation in a 1771 I/O chassis. Proper keying between pins 8 and 10, or between 30 and 32, ensures correct module placement. Configuration involves setting the appropriate communication parameters to match the connected ASCII device, including baud rate, data bits, parity, and operational mode.

By integrating the Allen-Bradley 1771-DA ASCII I/O Module into your control system, you can achieve efficient and reliable communication with a wide array of ASCII devices, enhancing the overall functionality and flexibility of your automation processes.