AB 1734-ADN adapter

Allen-Bradley 1734-ADN POINT I/O DeviceNet Adapter Overview

The Allen-Bradley 1734-ADN is a crucial component in Rockwell Automation's POINT I/O system, acting as a DeviceNet adapter. Its primary function is to provide the communication link between a DeviceNet industrial network and the various POINT I/O modules (digital, analog, specialty I/O). This allows users to distribute their I/O closer to the field devices, reducing wiring costs and simplifying system architecture while leveraging the robust DeviceNet protocol.

Product Detailed Description

• Function: The 1734-ADN adapter establishes communication between the DeviceNet master (e.g., PLC, HMI) and the POINT I/O modules connected to it. It manages the data exchange, converting DeviceNet messages into a format understood by the POINT I/O backplane and vice versa. It essentially makes the connected POINT I/O modules appear as DeviceNet nodes.

• Distributed I/O: It enables the distribution of I/O points throughout a machine or process, placing the I/O closer to the sensors and actuators. This minimizes the length of individual sensor/actuator wires, reduces conduit requirements, and simplifies troubleshooting.

• DeviceNet Protocol: It utilizes the DeviceNet open industrial network protocol, which is a low-level network that provides connections between industrial devices (sensors, actuators, motor starters, drives, etc.) and higher-level control systems. DeviceNet is based on the Common Industrial Protocol (CIP).

• Modular Design: As part of the POINT I/O system, it benefits from a highly modular and flexible design. Users can select and combine a wide range of discrete, analog, and specialty I/O modules based on their specific application needs.

• Status Indicators: It features clear LED indicators for network status (e.g., Net Status, Module Status, I/O Status) and power, which aid in quick visual diagnostics during commissioning and troubleshooting.

• Easy Configuration: Configuration of the 1734-ADN and its associated I/O modules is typically done through Rockwell Automation's programming software, such as Studio 5000 Logix Designer (for CompactLogix/ControlLogix systems) or RSNetWorx for DeviceNet.

• Power Distribution: It also provides power to the connected POINT I/O modules from the DeviceNet power line or an auxiliary power supply.

Product Parameters

(Note: Specific parameters can be found in the Allen-Bradley POINT I/O DeviceNet Adapter User Manual, often publication 1734-UM007.)

• Network Protocol: DeviceNet

• Communication Speed: Selectable, common DeviceNet baud rates (e.g., 125 kbps, 250 kbps, 500 kbps).

• Current Draw (Internal/Backplane): Typically around 300 mA at 5V DC (varies slightly).

• Field Power Input: 24V DC nominal.

• Current Draw (Field Power): Varies depending on connected I/O modules.

• Number of I/O Modules Supported: Up to 8 I/O modules can be connected to one adapter.

• Mounting: DIN rail mount.

• Wiring: Removable RTBs (Removable Terminal Blocks) for easy wiring.

• Indicators:

• Network Status LED (NET)

• Module Status LED (MOD)

• I/O Status LED (I/O)

• Power Status LED (PWR)

• Enclosure Rating: Open type (requires enclosure for protection).

• Operating Temperature: 0°C to 55°C (32°F to 131°F).

• Storage Temperature: -40°C to 85°C (-40°F to 185°F).

• Humidity: 5% to 95% non-condensing.

• Dimensions (H x W x D): Approx. 99 mm x 12 mm x 75 mm (3.9 in. x 0.47 in. x 2.95 in.) - for the adapter itself, without I/O modules.

• Certifications: UL Listed, CSA Certified, CE, C-Tick (RCM).

Product Advantages

• Reduced Wiring Costs: By distributing I/O closer to the field devices, it significantly reduces the amount of individual wiring needed, leading to lower material and labor costs.

• Simplified Troubleshooting: LED indicators provide immediate visual feedback on network and module status, speeding up diagnostics and reducing downtime.

• Flexible and Scalable: The modular POINT I/O system allows users to easily add or change I/O types as needs evolve, offering great flexibility.

• Compact Footprint: POINT I/O modules are very small, saving valuable panel space.

• Seamless Integration: Designed to integrate seamlessly with Rockwell Automation's Logix controllers and other DeviceNet-enabled devices.

• Standardized Protocol: Utilizes DeviceNet, a widely adopted and robust industrial communication protocol.

• Enhanced Diagnostics: Provides detailed diagnostic information back to the controller, allowing for proactive maintenance.

Precautions

• Proper DeviceNet Network Design: Ensure the DeviceNet network adheres to best practices regarding cable length, termination resistors, power tap points, and node addressing to ensure reliable communication.

• Power Supply: Use a stable and correctly rated 24V DC power supply for the field-side power. Ensure the DeviceNet network power supply is adequate for all connected nodes.

• Module Limits: Do not exceed the maximum number of I/O modules (8) that can be connected to a single 1734-ADN adapter.

• Configuration: Always configure the adapter and I/O modules using the appropriate Rockwell Automation software (e.g., Studio 5000, RSNetWorx for DeviceNet) and ensure correct DeviceNet MAC ID and baud rate settings.

• Grounding: Ensure proper grounding of the adapter and the entire POINT I/O system to prevent noise and ensure safety.

• Environmental Conditions: Install the adapter within its specified operating temperature and humidity ranges. Protect it from excessive vibration, shock, and contaminants. As an "open type" device, it requires mounting within a suitable enclosure.

• Firmware Compatibility: Ensure the firmware version of the adapter is compatible with the controller firmware and the version of the configuration software being used.

Product Applications

The Allen-Bradley 1734-ADN POINT I/O DeviceNet Adapter is suitable for a wide range of industrial automation applications where distributed I/O on a DeviceNet network is beneficial:

• Machine Control: Ideal for small to medium-sized machines where I/O points are spread out, such as packaging machines, assembly lines, and material handling equipment.

• Process Control: Can be used in discrete manufacturing processes for local I/O gathering from sensors and controlling actuators.

• Automotive Industry: Frequently used in automotive manufacturing for body shops, paint shops, and assembly lines where DeviceNet is a common network.

• Conveyor Systems: For managing distributed sensors (e.g., photo-eyes, proximity sensors) and actuators (e.g., motor starters, solenoids) along a conveyor line.

• Food and Beverage: In various segments requiring robust I/O handling in washdown or distributed environments.

• Semiconductor Manufacturing: For precise control and monitoring in fabrication facilities.

• Any application requiring cost-effective, modular, and distributed I/O over DeviceNet.

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