وصف
Description
The Allen-Bradley 1756-DNB/E is a Series E DeviceNet scanner module designed for integration within the ControlLogix platform. This module serves as a robust communication bridge, facilitating high-speed data exchange between the ControlLogix controller and various field devices distributed across a DeviceNet network. By offloading network management tasks from the main processor, the 1756-DNB/E ensures efficient I/O throughput and reliable control in demanding industrial environments.
Features
- Supports up to 64 nodes on a single DeviceNet network.
- Series E hardware revision for improved processing and firmware stability.
- Adaptive auto-baud detection for optimized communication across varying cable lengths.
- Dedicated front-facing DeviceNet port for trunk-line or drop-line physical connections.
- Integrated USB port for local diagnostics and network commissioning without interrupting backplane communication.
- Occupies a single slot in any standard ControlLogix chassis.
Technical Specifications
| Model |
1756-DNB/E (Series E) |
| Brand |
Allen-Bradley |
| Platform |
ControlLogix |
| Max Nodes |
64 |
| Data Rates |
125 Kbps (500m), 250 Kbps (250m), 500 Kbps (100m) |
| Backplane Current |
400 mA @ 5.1 VDC |
| Power Dissipation |
3.5 Watts (11.9 BTU/hr) |
| External Voltage |
11 to 25 VDC |
Installation Guidelines
- Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent electrical damage.
- Install the module into any available slot in the chassis; ensure it is fully seated and the top/bottom latches are secured.
- Use shielded, twisted-pair cabling for DeviceNet connections to minimize EMI interference.
- Follow standard grounding procedures for the DeviceNet network to ensure signal integrity.
- Maintain proper ventilation in the control cabinet to keep ambient temperatures within operating limits.
FAQ
Is the USB port on the 1756-DNB/E intended for permanent network connection?
No, the USB port is designed for local configuration, commissioning, and maintenance tasks. It functions independently of the backplane and is not intended for continuous network data transmission.
What is the maximum distance supported by this module?
The maximum distance is dependent on the baud rate: 500m at 125 Kbps, 250m at 250 Kbps, and 100m at 500 Kbps.
