Description:The Allen-Bradley 2080-DNET20 is a DeviceNet scanner (master) plug-in module designed for the Micro800 series of programmable logic controllers (PLCs). This compact communication card plugs directly into the side or front slot of compatible Micro800 CPUs (such as Micro820, Micro830, Micro850), instantly upgrading them from standalone controllers to DeviceNet master stations. It manages up to 20 logical nodes and supports both I/O scanning (for real-time data exchange with remote I/O blocks and drives) and explicit messaging (for parameter configuration). As a cost-effective gateway, it allows small to mid-sized machines to leverage the DeviceNet fieldbus ecosystem without investing in a larger ControlLogix system.Application Scenarios:In a Taiyuan-based material handling system, a Micro850 PLC equipped with the 2080-DNET20 module acts as the central brain. It scans multiple Point I/O stations distributed along the conveyor line, reading sensor data from photoelectric switches and controlling solenoid valves. The module’s ability to handle both discrete I/O and explicit messaging allows operators to monitor drive parameters remotely via HMI, all while maintaining deterministic control over the network.
Parameter:
| Parameter | Value / Specification |
|---|---|
| Product Model | 2080-DNET20 |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Type | DeviceNet Scanner (Master) Plug-in Module |
| Compatible Controllers | Micro810, Micro820, Micro830, Micro850, Micro870 |
| Maximum Nodes | 20 logical nodes (I/O operation) |
| Supported Protocols | DeviceNet (CIP), Explicit Messaging, Polled I/O |
| Baud Rates | 125 kbps, 250 kbps, 500 kbps (Auto-baud capable) |
| Network Port | 5-pin removable screw terminal (CAN_H, CAN_L, V+, V-, Shield) |
| Isolation Voltage | 50V continuous (field to system) |
| Power Supply | 24V DC (from controller backplane or external) |
| Power Consumption | Max 1.44 W (Backplane: ~50 mA @ 24V DC) |
| Status Indicators | MOD (Module), NET (Network), NS (Network Schedule) |
| Configuration Software | Connected Components Workbench (CCW) |
| Operating Temperature | -20°C to 65°C (0°C to 60°C for full performance) |
Technical Principles and Innovative Values:The 2080-DNET20 transforms the Micro800 from a simple local controller into a distributed system master, offering unique integration benefits.
- Innovation Point 1: True Plug-in Architecture. Unlike external gateways that require separate DIN rail space, power wiring, and complex routing, the 2080-DNET20 snaps directly into the controller’s expansion slot. It draws power from the PLC backplane and is configured entirely within the Connected Components Workbench (CCW) software, creating a seamless “single-vendor” solution that reduces cabinet footprint and wiring complexity.
- Innovation Point 2: Integrated Scanner Functionality. The module operates as a full DeviceNet Master (Scanner), not just a bridge. It manages the scanlist internally and maps remote DeviceNet I/O data directly into the Micro800’s data table. This allows ladder logic to access distributed I/O points as if they were local, simplifying programming and diagnostics for engineers familiar with Rockwell’s ecosystem.
- Innovation Point 3: Dual-Mode Communication. The 2080-DNET20 supports both I/O Messaging (for high-speed, cyclic data transfer with remote devices) and Explicit Messaging (for parameter read/write operations). This dual capability means the same network can handle real-time control of a motor starter block while also allowing an HMI to periodically read diagnostic data from a PowerFlex drive, maximizing the utility of the fieldbus.
