The Allen‑Bradley 1756‑DNB is a DeviceNet Bridge/Scanner Module for the ControlLogix® platform that interfaces between DeviceNet devices and the ControlLogix controller. It acts as a scanner on the DeviceNet network, collecting I/O data from up to 64 slave devices and mapping it into the controller's tag database.
Item No :
1756-DNBOrder(MOQ) :
1 PiecePayment :
EXWProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
3KG| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Model | 1756‑DNB |
| Product Family | ControlLogix |
| Product Type | DeviceNet Bridge/Scanner Communication Module |
| Number of Channels | 1 |
| Max Nodes Supported | 64 |
| Data Capacity | Up to 124 input words and 123 output words (32‑bit) |
| Communication Rates | 125 Kbps (500 m max), 250 Kbps (250 m max), 500 Kbps (100 m max) |
| Backplane Current Draw | 400 mA @ 5.1V DC; 0 mA @ 24V DC |
| DeviceNet Current Draw | 60 mA @ 24V DC |
| Power Dissipation | 3.5 W (11.9 BTU/hr) |
| Isolation Voltage | 50V continuous (basic insulation); tested at 853V AC @ 60s between DeviceNet network and backplane |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C |
| Module Location | Any slot in ControlLogix chassis |
| Configuration Software | RSLogix 5000 / Studio 5000; RSNetWorx for DeviceNet |
| Diagnostics | 4‑character display and LED indicators (MOD/NET, I/O) |
| Key Features | Automatic Device Replacement (ADR), Auto Address Recovery (AAR), Configuration Recovery (CR), RIUP, slave mode, flash firmware upgradeable, Quick Connect |
| Model | Description | Typical Application |
|---|---|---|
| 1756‑DNB/A, /C, /D | Revision variants of the same module | Different firmware/hardware revisions |
| 1756‑EN2T | EtherNet/IP communication module | Adding EtherNet/IP connectivity |
| 1756‑CN2R | ControlNet communication module (redundant) | ControlNet network integration |
| 1756‑DHRIO | Data Highway Plus/Remote I/O module | Legacy DH+ network connectivity |
| 1756‑EWEB | Embedded web server module | Web-based monitoring and diagnostics |
| 1756-A10 | 1794-IE8XT | 1769-IF4I |
| 1756-A13 | 1794-IF2XOF2I | 1769-IF4XOF2 |
| 1756-A17 | 1794-IF4I | 1769-IF8 |
| 1756-A4 | 1794-IF8IH | 1769-IG16 |
| 1756-A7 | 1794-IG16 | 1769-IM12 |
| 1756-BA1 | 1794-IH16 | 1769-IQ16 |
| 1756-BA2 | 1794-IJ2 | 1769-IQ16F |
| 1756-BATA | 1794-IM16 | 1769-IQ32 |
| 1756-BATM | 1794-IM8 | 1769-IQ32T |
| 1756-CFM | 1794-IP4 | 1769-IQ6XOW4 |
| 1756-CN2 | 1794-IR8 | 1769-IR6 |
| 1756-CN2R | 1794-IRT8 | 1769-IT6 |
| 1756-CNB | 1794-IRT8K | 1769-OA16 |
Q1: What is the primary function of the 1756‑DNB?
It serves as a DeviceNet scanner, collecting I/O data from up to 64 DeviceNet slave devices and mapping that data into the ControlLogix controller's tag database . It can also function as a gateway to bridge data between DeviceNet and other CIP networks .
Q2: What communication rates does the 1756‑DNB support?
The module supports three baud rates: 125 Kbps (maximum cable length 500 m), 250 Kbps (250 m), and 500 Kbps (100 m) .
Q3: What is ADR (Automatic Device Replacement) and how does it work?
ADR is a feature that allows a replacement DeviceNet device to be automatically configured with the same node address and parameters as the failed unit. The 1756‑DNB with 1 MB memory supports both Auto Address Recovery (AAR) and Configuration Recovery (CR) – when a device fails, simply replace it with a new one and the scanner will reprogram it automatically .
Q4: What configuration tools are required for the 1756‑DNB?
The module is configured using RSLogix 5000 / Studio 5000 for chassis integration and RSNetWorx for DeviceNet for scanlist and I/O mapping . EDS files may need to be registered for unrecognized devices .
Q5: Is the 1756‑DNB suitable for safety applications?
Yes. The module is marked "Suitable for safety functions" and supports DeviceNet Safety protocol . However, the specific safety application must be properly designed and certified per relevant standards.
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The Allen‑Bradley 1756‑DNB is a DeviceNet Bridge/Scanner Module for the ControlLogix® platform that interfaces between DeviceNet devices and the ControlLogix controller. It acts as a scanner on the DeviceNet network, collecting I/O data from up to 64 slave devices and mapping it into the controller's tag database.
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