Overview
The Allen-Bradley 1756-DNB /A is a ControlLogix DeviceNet scanner communication module manufactured by Rockwell Automation. This module provides seamless integration between DeviceNet networks and ControlLogix controllers. It acts as a bridge type module that fits any slot of a ControlLogix chassis, collects data from DeviceNet modules and delivers a copy of the data to a controller, and vice versa. The module is designed for controls engineers and system integrators requiring industrial-grade DeviceNet connectivity in large-scale automation networks.
Key Features
- Supports up to 64 DeviceNet nodes with addresses from 00 to 63, enabling large-scale device connectivity.
- Supports DeviceNet communication rates of 125, 250, or 500 Kbps and provides reliable data exchange between controllers and DeviceNet devices.
- Has one channel and five male pins with scanner capability, slave capability, and explicit messaging.
- Acts as a gateway between DeviceNet devices to read input and write output from a device, download the configuration data, and monitor the operational status of a device.
- Installs in any available slot of a ControlLogix 1756 chassis with no backplane conflicts.
Technical Specifications
- Communication Rates: 125 Kbps (500 m max), 250 Kbps (250 m max), 500 Kbps (100 m max)
- Node Capacity: 64 DeviceNet nodes (addresses 00–63)
- Power Consumption (5 VDC): 580 mA from backplane
- Power Consumption (24 VDC): 3 mA from backplane
- Maximum Power Dissipation: 5.8 W
- Insulation Voltage: 30 V continuous
- Operating Temperature Range: 0–60 °C
- Connectivity: DeviceNet connector, five male pins
- Module Type: ControlLogix communication module (1756 form factor)
- Certification: UL Listed Industrial Control Equipment (UL File E65584)
Typical Applications
The 1756-DNB /A is used in:
- Manufacturing automation systems requiring bridging of legacy DeviceNet sensor and actuator networks.
- Discrete and process control systems needing multi-node device integration in ControlLogix environments.
- Industrial automation gateways where DeviceNet devices must communicate with modern Ethernet/IP or other industrial networks via a ControlLogix platform.
- Systems utilizing RSNetWorx configuration software for DeviceNet scanner parameter setup and diagnostics.
Compatibility & Replacements
Compatible With
- Logix5550 controllers only
- ControlLogix 1756 chassis (any available slot)
- DeviceNet networks operating at 125, 250, or 500 Kbps
- RSNetWorx configuration and monitoring software
- Rockwell Automation Studio 5000 environment (for controller logic)
Replaces / Drop-In Replacement For
No alternative part numbers identified for direct drop-in replacement. The 1756-DNB /A is the primary DeviceNet scanner module for ControlLogix 1756 platforms. Consult with your system integrator for legacy system migration options.
Works With
- RSNetWorx for DeviceNet configuration and monitoring
- Logix5550 controllers with DeviceNet messaging capability
- DeviceNet sensors, drives, remote I/O, and industrial devices
- ControlLogix chassis backplane communication architecture
- EtherNet/IP gateways (when paired with additional 1756 communication modules)
