The Allen-Bradley 1756-DNB is a ControlLogix DeviceNet scanner module designed to manage high-speed data exchange between controllers and distributed field devices.
The Allen-Bradley 1756-DNB functions as a high-performance DeviceNet scanner module within the ControlLogix platform. This module serves as a bridge, facilitating seamless data exchange between the central PLC and up to 63 field devices, such as actuators, sensors, and variable frequency drives. Because the unit offloads network traffic management from the controller, it optimizes overall system performance and reduces scan time. Furthermore, the 1756-DNB supports multiple messaging formats, including polled, strobed, and change-of-state communication, which allows engineers to tailor bandwidth usage for specific operational requirements. Since Rockwell Automation discontinued this module in 2016, it serves primarily as a critical replacement component for maintaining established industrial automation architectures.
Technicians install the 1756-DNB directly into any available slot within a ControlLogix chassis to enable network connectivity. The module integrates with RSNetWorx for DeviceNet software, which simplifies configuration, device commissioning, and network troubleshooting. Moreover, the hardware provides extensive diagnostic feedback, allowing users to identify node failures, network interruptions, or configuration discrepancies in real time. Consequently, maintenance teams resolve issues rapidly, which minimizes costly downtime in complex manufacturing environments. Because the design emphasizes robust signal processing, the module maintains reliable communication even in electrically noisy settings. By deploying the 1756-DNB, facilities ensure the continued stability of their legacy automation networks while managing distributed I/O devices with precision.
| Parameter | Specification |
|---|---|
| Model | 2094-BM02-S |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.9 kg |
| Dimensions | 3.5 x 13 x 14.5 cm |
| Operating Temp | 0 to +50 deg C (Standard Industrial Range) |
| Power Consumption | 650 VDC nominal input / 115 Ohm internal shunt resistor |
| Module Type | Servo Drive (Axis Module) |
| Product Range | ControlLogix / Kinetix 6000 |
| System Classification | PLC Motion Control |
| Continuous Current | 10.3 A (RMS), 14.6 A (Sine Peak) |
| Velocity Loop Bandwidth | 500 Hz |
| Current Loop Frequency | 1300 Hz |
| Efficiency Rating | 98% |
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