Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 9)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 9
Preface
Rockwell Automation uses open network technology for seamless, plant-wide
integration. These open networks share a universal set of communication
services. As a result, information can be communicated seamlessly throughout
the plant and to and from the Internet for e-business applications.
Each Rockwell Automation network is ideal for a wide range of applications,
operates with devices manufactured by various vendors, and shares data with
industry-standard information networks.
Comparison EtherNet/IP Network ControlNet Network DeviceNet Network
Function Plant management system tie-in (material
handling) with configuration, data collection,
and control on a single high-speed network Supports transmission of time critical data
between PLC processors and I/O devices Connects low-level devices directly to
plant-floor controllers without the use of I/O
modules
Typical devices networked • Mainframe computers
• Programmable controllers
• Robots
• HMI
• I/O
• Drives
• Process instruments • Programmable controllers
• I/O chassis
• HMIs
• Personal computers
• Drives
• Robots • Sensors
• Motor starters
• Drives
• Personal computers
• Push buttons
• Low-end HMIs
• Bar code readers
• PLC processors
• Valve manifolds
Data repetition Large packets, data sent regularly Medium-size packets; data transmissions are
deterministic and repeatable Small packets; data sent as needed
Number of nodes, max No limit 99 nodes 64 total nodes
Data transfer rate 10 Mbps, 100 Mbps, or 1 Gbps 5 Mbps 500, 250, or 125 Kbps
Typical use Plant-wide architecture
High-speed applications Redundant applications
Scheduled communication Supply power and connectivity to low-level
devices