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Industrial Communication Module Technical Report
Model: 1756-DNB DeviceNet Scanner Module
1. Product Overview
The 1756-DNB is a DeviceNet scanner communication module used in ControlLogix-based industrial automation systems. It functions as a bridge between a PLC controller and a DeviceNet network, enabling communication with distributed field devices such as sensors, actuators, drives, and remote I/O blocks.
It operates as a master (scanner) on the DeviceNet network, managing data exchange, polling, and network diagnostics for connected slave devices.
This module is widely used in machine-level control systems and distributed automation environments where DeviceNet is still implemented as a field-level network.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756 Series
- Product Family: DeviceNet Communication / Scanner Modules
- Module Type: DeviceNet Scanner (Master) Module
The 1756 platform is a modular PLC system designed for scalable automation architectures, supporting multiple industrial communication protocols including DeviceNet, ControlNet, and Ethernet/IP.
3. Product Description
The 1756-DNB module acts as a DeviceNet network scanner. It controls communication between the ControlLogix backplane and DeviceNet devices.
It supports explicit messaging and I/O polling, allowing real-time control of distributed field devices. The module also performs network diagnostics and device configuration management.
It is typically installed in a ControlLogix chassis and occupies a single slot. It includes a DeviceNet communication port and integrates directly into the PLC backplane.
This module is especially common in machine-level automation systems such as packaging machines, material handling equipment, and assembly systems.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | DeviceNet |
| Network Role | Master / Scanner |
| Data Rate | 125 kbps / 250 kbps / 500 kbps |
| Maximum Nodes | 63 nodes |
| Maximum I/O Connections | 64 slave devices (typical) |
| Network Cable Length | up to 500 m (depending on baud rate) |
| Backplane Current (5V) | ~900 mA |
| Backplane Current (24V) | ~3 mA |
| Power Consumption | ~4.5 W |
| Thermal Dissipation | ~15 BTU/hr |
| DeviceNet Port | 1 × 5-pin terminal |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5% – 95% non-condensing |
| Vibration Resistance | 2 G (10–500 Hz) |
| Shock Resistance | 30 G operating |
| Chassis Compatibility | 1756 ControlLogix chassis |
| Slot Width | 1 slot |
| Dimensions | approx. 140 × 145 × 35 mm |
| Weight | ~0.25 – 0.30 kg |
5. Product Applications
The 1756-DNB is widely used in machine-level and distributed automation systems:
- Packaging machinery control systems
- Conveyor and material handling systems
- Automotive assembly lines
- Food and beverage production equipment
- Industrial robotics and motion systems
- Small to medium manufacturing machines
- Distributed sensor and actuator networks
- Legacy DeviceNet field device integration
It is especially suitable for systems where DeviceNet remains installed as a field-level industrial communication standard.
6. Product Advantages
- Stable DeviceNet master (scanner) functionality
- Supports up to 63 nodes on a single network
- Multi-speed communication (125 / 250 / 500 kbps)
- Reliable real-time I/O scanning
- Simple integration into ControlLogix chassis
- Strong compatibility with legacy DeviceNet devices
- Effective for machine-level distributed control
- Low power consumption and stable thermal performance
- Proven long-term industrial reliability
- Cost-effective solution for field-level networking
7. Same Series / Related Models (ControlLogix Communication Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-DNB | DeviceNet scanner module | 500 kbps max, 63 nodes, ~0.28 kg |
| 1756-DHRIO/C | DH+ / RIO communication module | Legacy industrial protocol support |
| 1756-CN2R | ControlNet redundant module | 5 Mbps redundant network |
| 1756-CNB | ControlNet bridge module | Single-channel ControlNet |
| 1756-EN2TR | EtherNet/IP redundant module | Dual Ethernet ports, modern network |
8. Other Popular Modules in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC controller module | High-performance CPU, large memory |
| 1756-L72 | Advanced PLC controller | Faster processing capability |
| 1756-IF8 | Analog input module | 8-channel analog signal input |
| 1756-OB16E | Digital output module | 16-point electronic output |
| 1756-IB16 | Digital input module | 16-channel digital input module |
9. Engineering Summary
The 1756-DNB is a dedicated DeviceNet scanner module designed for machine-level industrial automation. Its primary role is to manage communication between PLC systems and distributed DeviceNet field devices.
While newer Ethernet-based systems are now dominant, the 1756-DNB remains widely used in legacy and hybrid industrial environments due to its stability and large installed base.
It provides a reliable and cost-effective solution for maintaining and operating DeviceNet-based automation systems.