1794-ASB Adapter | Allen-Bradley Remote I/O Module

Product Overview

The 1794-ASB is an Allen-Bradley Flex I/O Remote I/O communication adapter. It provides a reliable interface between controllers and distributed I/O modules.

Communication and Connectivity

This adapter has one RIO communication port that supports legacy RIO protocols. It connects to Flex I/O racks or scanners using Belden 9463 or equivalent cables. The supported topologies include daisy chain configuration. Communication rates are 57.6, 115.2, and 230.4 Kbps, enabling flexible data transfer.

Power and Thermal Specifications

The 1794-ASB operates on 24V DC with a power consumption of 330 mA. It dissipates 4.6 W of power, equivalent to 15.7 BTU/hr. External supply current may reach 450 mA at 24V DC.

Physical and Environmental Characteristics

This module mounts on a standard DIN rail and supports up to eight I/O modules. It has dimensions of 4 × 2 × 4 inches with an open-type IP20 enclosure. Operating temperature ranges from 0°C to 55°C, and storage temperature ranges from -40°C to 85°C. The device withstands 5 g vibration per IEC 68-2-6 and 30 g shock peak acceleration.

Indicators and Diagnostics

The 1794-ASB features diagnostic indicators for Power, Adapter Active, Adapter Fault, and Local Fault. It allows real-time monitoring and troubleshooting of the connected I/O system.

Compatibility and Applications

This adapter is compatible with legacy Allen-Bradley controllers such as PLC2, PLC3, PLC5, and SLC500 platforms. It also supports modern Logix controllers and certain third-party devices. The 1794-ASB transmits data using Block Transfer Read (BTR) and Block Transfer Write (BTW) instructions.

The Allen-Bradley 1794-ASB Flex I/O Remote I/O Adapter ensures robust communication between distributed I/O and controllers, providing reliable and efficient automation control in industrial applications.