Allen Bradley 1794-ADN

Brand: Allen Bradley
Model: 1794-ADN

Inventory situation: Goods are available in stock.

Product features

The Allen Bradley 1794-ADN is a dependable Flex I/O DeviceNet media adapter module created by Rockwell Automation for industrial automation systems. As a crucial component of the Allen Bradley 1794 Flex I/O product line, this module serves as a link between Flex I/O modules and DeviceNet networks, allowing for seamless data interchange in a variety of industrial situations. It runs on a 24V DC power source and has a voltage range of 19.2V to 31.2V DC, making it ideal for most industrial power systems. The Allen Bradley 1794-ADN has a normal current draw of 300mA and a maximum inrush current of 14A for 5 milliseconds during startup, assuring consistent performance once turned on.

One of the Allen Bradley 1794-ADN's most notable features is its adaptable communication capabilities. It supports the DeviceNet protocol, which is based on the Common Industrial Protocol (CIP), and automatically recognizes transmission baud rates of 125 kbps, 250 kbps, and 500 kbps. This enables the module to smoothly interface with ControlLogix, CompactLogix, and other Allen Bradley PLCs while fulfilling various network speed requirements. The module has one DeviceNet port, which accepts an open-style 5-pin or 10-pin linear plug, and a Network Access Port (NAP) for programming and diagnosis. It can link up to eight Flex I/O modules, which include digital, analog, and special function modules, allowing for flexible expansion of industrial control systems.

The Allen Bradley 1794-ADN is constructed with industrial-grade materials to resist tough operating conditions. It operates at temperatures ranging from -20°C to 70°C and stores at -40°C to 85°C, allowing it to function reliably in both cold and high temperatures. The module can withstand 5g of vibration at 10-500Hz and 30g of peak acceleration, ensuring dependable operation in manufacturing workshops, automobile factories, and other environments with mechanical disturbance. It also provides a 60-second isolation voltage of 1930V DC between the power supply, DeviceNet, FlexBus, and chassis ground to improve system safety.

Specifications

Model	1794-ADN
Product Type	Flex I/O DeviceNet Media Adapter Module
Series	1794 Flex I/O Series
Replacement Product	5094-AENTR
Power Supply Voltage	24V DC
Communication Protocol	DeviceNet
Supported Baud Rates	125 kbps, 250 kbps, 500 kbps (auto-detect)
Enclosure Type	Open style

Precautions

When utilizing the Allen Bradley 1794-ADN Flex I/O DeviceNet adapter module, always emphasize safety and adhere to established instructions to maintain steady performance. First, understand the product's life cycle: Rockwell Automation has declared that the Allen Bradley 1794-ADN will be retired on October 31, 2026. Plan ahead of time to transition to its recommended successor, the 5094-AENTR, which is an engineering replacement that is compatible with the majority of existing Allen Bradley 1794-ADN-based systems.

Electrical safety is essential for the Allen Bradley 1794-ADN. Use a 24V DC power supply with a voltage range of 19.2V to 31.2V DC, and make sure the power source can generate a maximum inrush current of 14A for 5 milliseconds during startup; insufficient power may cause the module to malfunction or fail. When handling the Allen Bradley 1794-ADN, avoid electrostatic discharge (ESD) by wearing an anti-static wristband or grounding yourself before touching the module to protect its internal components.

When replacing an Allen Bradley 1794-ADN with firmware revision 2.003 or older with a device running revision 2.005 or later, exercise extreme caution, especially if 32-point Flex I/O modules are connected. The previous firmware may consider 32-point modules as 16-point ones, resulting in an I/O size mismatch (scanner error 77) following the upgrade. To resolve this, update the scanner's scan list to reflect the new I/O size, then modify the controller's ladder program and I/O image table correspondingly.

FAQ

Q: What is the Allen Bradley 1794-ADN, and what is its primary function?

A: Allen Bradley's 1794-ADN is a Flex I/O DeviceNet Adapter Module. Its principal function is to provide an interface between Rockwell Automation's Flex I/O modules and a DeviceNet network. The DeviceNet protocol allows for real-time data interchange, I/O control, and communication between a central controller (such as a PLC) and distributed I/O points in an industrial automation system.

Q: How do I configure the Allen Bradley 1794-ADN DeviceNet adapter?

A: Configuration is often performed using Rockwell Automation software such as RSLogix 5000 or Studio 5000 Logix Designer, as well as RSNetWorx for DeviceNet. The DeviceNet node address and baud rate must be set using the module's dual rotary switches on the front. The I/O configuration is then mapped within the PLC project to match the physical Flex I/O modules linked downstream.

Q: What is the maximum number of I/O points supported by one 1794-ADN adapter?

A: The Allen Bradley 1794-ADN's I/O capacity is determined by the Flex I/O modules that are attached. Each adapter can support up to eight modules, each with a different number of points (for example, 4, 8, or 16). Total points must also adhere to DeviceNet packet size constraints, which normally allow for up to 64 words of input and 64 words of output per scanner.