The Allen-Bradley 1756-DNB/E is a Series E DeviceNet scanner module designed for integration within the ControlLogix platform. This communication interface acts as a bridge between the ControlLogix controller and various field-level devices, supporting robust data exchange across a DeviceNet network. As a Series E revision, this module offers refined hardware architecture and improved firmware reliability, enabling efficient management of up to 64 connected nodes in demanding industrial environments such as material handling and automated assembly lines.
Features
Supports up to 64 nodes on a single DeviceNet network.
Integrated USB port for local configuration and diagnostics, independent of the backplane.
Automatic baud rate detection to optimize communication speeds based on cable length.
High-speed data mapping and diagnostic management for distributed I/O.
Standard ControlLogix form factor for single-slot chassis installation.
Applications
This module is primarily utilized in industrial automation systems where high-speed communication between a central controller and remote field devices is required. It is well-suited for distributed control architectures, sensor integration, and complex machine-to-machine communication tasks within manufacturing facilities.
Technical Specifications
Model
1756-DNB/E (Series E)
Platform
ControlLogix
Network Type
DeviceNet
Node Capacity
64 Devices
Transmission Speeds
125 Kbps (500m), 250 Kbps (250m), 500 Kbps (100m)
Backplane Current
400 mA @ 5.1 VDC
External Voltage
11 to 25 VDC
Power Dissipation
3.5 Watts
Thermal Dissipation
11.9 BTU/hr
Installation Guidelines
Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent electrical damage.
Verify that the module is fully seated in the chassis slot and the locking tabs are secured.
Use shielded twisted-pair cabling for DeviceNet connections to minimize electromagnetic interference (EMI).
Maintain proper ventilation in the control cabinet to keep the module within its operating temperature range.
Follow standard ESD (Electrostatic Discharge) mitigation practices when handling the module to protect internal circuitry.
FAQ
Q: Does the 1756-DNB/E require an external power supply for the DeviceNet network? A: Yes, the module requires an external 11 to 25 VDC supply to power the DeviceNet network segment.
Q: Can I use the USB port while the system is running? A: Yes, the onboard USB port is designed for local configuration and diagnostics without interrupting the data exchange occurring over the chassis backplane.
