Get now the 2080-DNET20, a high-performance DeviceNet scanner plug-in module designed to expand the networking capabilities of Allen-Bradley Micro800 controllers. This module allows your PLC to serve as a master node on a DeviceNet network, enabling control over a wide array of industrial field devices.
What Is the 2080-DNET20?
The 2080-DNET20 is a specialized communication plug-in for Micro820, Micro830, Micro850, and Micro870 controllers. It acts as a DeviceNet scanner (Master), allowing the Micro800 PLC to communicate with up to 20 different DeviceNet slave devices, such as PowerFlex drives, E300 overload relays, and various I/O blocks. By utilizing the 2080-DNET20, machine builders can bridge the gap between their low-cost micro-PLC and established DeviceNet-based sensors and actuators. The module uses a standard 5-pin open-style connector for the network trunk and fits directly into the front plug-in slots of the controller. Its architecture supports both Polled and Change of State (COS) I/O messaging, ensuring efficient use of the 500 Kbps network bandwidth. This makes the 2080-DNET20 an essential component for system integrators retrofitting modern controllers into existing DeviceNet infrastructures.
Key Technical Specifications
- Protocol: DeviceNet Scanner (Master)
- Maximum Nodes: Up to 20 slave devices
- Baud Rates: 125, 250, and 500 Kbps (Auto-detection support)
- Physical Interface: 5-pin open-style linear header
- Isolation: 500V DC between network and PLC logic
- Power: Network-powered (24V DC from DeviceNet cable)
- Compatibility: Micro820, Micro830, Micro850, Micro870
- Status LEDs: Network (NET) and Module (MOD) diagnostics
Advanced Networking and Control
The 2080-DNET20 architecture allows for the deterministic control of motor drives and remote I/O points. Within the Connected Components Workbench (CCW) software, the scanner is configured using a simplified interface that maps DeviceNet I/O directly into the controller’s memory tags. This eliminates the need for complex custom code to handle network packets. The module also supports explicit messaging, which allows for acyclic data transfer—perfect for reading detailed diagnostics or changing drive parameters on the fly without disrupting the high-priority real-time control traffic. This dual-path communication is vital for maintaining high OEE (Overall Equipment Effectiveness) in modern manufacturing plants.
Maintenance Tips
When maintaining a network using the 2080-DNET20, ensure that the DeviceNet power supply (24V DC) is stable and that the network is properly terminated with 121-ohm resistors at both ends. Signal reflections from poor termination are the leading cause of intermittent communication errors. Periodically check the «NET» LED status; a flashing red light usually indicates a timeout with one or more slave nodes. If you are adding new devices, verify that the total network current draw does not exceed the capacity of the DeviceNet cable and that each device has a unique Node Address (MAC ID).
Frequently Asked Questions
Q: Can the 2080-DNET20 be used as a DeviceNet Slave?
A: No, the 2080-DNET20 is specifically designed as a Scanner (Master). To connect a Micro800 as a slave to another master, different communication methods or modules are typically required.
Q: What is the maximum distance for a network using the 2080-DNET20?
A: At 125 Kbps, the network can reach up to 500 meters using thick trunk cable. At 500 Kbps, the maximum distance is reduced to 100 meters to maintain data integrity.
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