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NetLinx Open Architecture
Network Selection
Each Allen-Bradley network is ideal for a wide-range of applications. Plus, all Allen-Bradley Open Communication Networks operate with devices manufactured by various vendors and share data with industry-standard information networks.
| ControlNet Network | DeviceNet Network | EtherNet/IP Network | Universal Remote I/O Link | DH-485 Network Overview | Data Highway Plus Network | |
| Function | Supports transmission of time-critical data between PLC processors and I/O devices | Connects low-level devices directly to plant-floor controllers — without interfacing them through I/O modules | Plant management system tie-in (material handling); configuration, data collection, and control on a single high-speed network | Provides connection between PLC processors and I/O adapters | Provides connection between SLC processors, HMI, and programming devices | Permits plant-wide and cell-level data sharing with program maintenance |
| Typical Devices Networked | PLC processors, I/O chassis, HMIs, PCs, drives, robots | Sensors, motor starters, drives, PCs, push buttons, low-end HMIs, bar code readers, PLC processors, valve manifolds | Mainframe computers, PLC processors, robots, HMI, I/O and I/O adapters, drives | PLC processors, I/O chassis, drives, PanelView operator terminals, RediPANEL operator modules | SLC processors, PCs, HMIs, MicroLogix | PLC processors, SLC Processors, ControlLogix, PCs, HMIs |
| Data Repetition | Medium-size packets; data transmissions are deterministic and repeatable | Small packets; data sent as needed | Large packets, data sent regularly | Medium-size or small packets; data sent regularly | Small packets; data sent periodically or as needed | Medium-size packets; data sent regularly |
| Number of Nodes (max.) | 99 | 64 logical | No limit | 1 scanner and 32 adapters | 32 | 64 per link (network can have 99 links) |
| Data Transfer Rate | 5 Mbps | 500, 250, or 125 Kbps | 10 Mbps, 100 Mbps | 230.4, 115.2, or 57.6 Kbps | 19.2 Kbps | 57.6… 230 Kbps |
| Device Suppliers | Open | Open | Open | Rockwell Automation and its partners | ||