Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-DNB |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | DeviceNet Scanner Communication Module |
| Communication Protocol | DeviceNet (based on CAN) |
| Network Ports | 1 x DeviceNet (5‑pin/10‑pin linear plug) |
| Maximum Nodes Supported | 63 (Node 00 to 63) |
| Baud Rates | 125 kbps (500 m), 250 kbps (250 m), 500 kbps (100 m) |
| Backplane Current Draw | 400 mA @ 5.1V DC; 60 mA @ 24V DC |
| Power Dissipation | 3.5 W (11.9 BTU/hr) |
| Isolation (DeviceNet to Backplane) | 50 V continuous, tested at 853V AC |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% non‑condensing |
| Certifications | UL, CE, ATEX, IECEx, RCM, CCC |
Main Features and Advantages
The Allen‑Bradley 1756‑DNB delivers high‑performance DeviceNet scanning with advanced configuration and diagnostic tools. It supports a full range of I/O messaging modes, allowing efficient data transfer tailored to device requirements: polled for regular updates, cyclic for periodic data, change‑of‑state for event‑driven updates, and explicit messaging for configuration and diagnostics. The module simplifies network setup and troubleshooting with RSNetWorx for DeviceNet software integration, enabling graphical mapping of devices and comprehensive network health monitoring. For system reliability, the 1756‑DNB offers support for DeviceNet Safety protocols, allowing integration of safety devices into the control architecture. Its flexible mounting in any ControlLogix chassis slot and support for Removal and Insertion Under Power (RIUP) facilitate easy maintenance and system expansion without shutdown. Built for harsh industrial environments, the module provides robust electrical isolation and EMC immunity, ensuring stable operation in noisy electrical conditions.
Application Field
The Allen‑Bradley 1756‑DNB is widely used in manufacturing and process industries to connect ControlLogix controllers with distributed field devices. In automotive and general assembly lines, it networks motor starters, photoelectric sensors, and push‑button stations to central controllers, reducing wiring complexity and enabling real‑time monitoring of conveyor and robotic cell operations. For material handling systems, the 1756‑DNB integrates barcode readers, AGV (Automated Guided Vehicle) controls, and palletizer I/O over a single trunk line. In process industries like food & beverage and water treatment, the module connects remote I/O panels and valve manifolds, allowing centralized control of pumps and mixing stations. It also serves as a cost‑effective bridge in legacy system upgrades, enabling modern ControlLogix controllers to communicate with existing DeviceNet device networks without complete rewiring. Additionally, its support for safety protocols makes it suitable for applications requiring coordinated standard and safety control on a single network.
Related Products
- 1756‑L7x (ControlLogix Controllers): Logix556x and newer L7 series controllers that serve as the central processor when using the 1756‑DNB as a scanner.
- 1756‑A4 / A7 / A10 / A13 Chassis: Various slot-count chassis that house the 1756‑DNB module and provide backplane power and communication.
- 1756‑PA75 / PB75 Power Supplies: Standard and redundant power supplies used to energize the chassis containing the scanner module.
- 1756‑DNB Series B (1756-DNB/B): Earlier series of the same module with similar core functionality but potentially different firmware revisions.
- 160‑DNB DeviceNet Scanner: An alternative standalone scanner for non‑ControlLogix platforms (e.g., PLC‑5, SLC) that can coexist on the same network.
- 1794‑ADN Flex I/O Adapter: A common DeviceNet slave device that the 1756‑DNB scanner can communicate with to manage remote I/O racks.
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