Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario descargar pdf (Pagina 75)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 75

EtherNet/IP Protocol Chapter 4

Typical time synchronized applications include the following:

• Input time stamping

– Events and alarms

– Sequence of Events recording

– First fault detection

• Time scheduled outputs

• Integrated motion on EtherNet/IP drive synchronization

• Distributed motion control

CIP Sync a time synchronization extension to the application layer can help solve

these application requirements. CIP Sync is based on the IEEE 1588 (IEC

61588) standard—Precision Clock Synchronization Protocol for Networked

Measurement and Control Systems, commonly referred to as the Precision Time

Protocol (PTP). The protocol provides a standard mechanism to distribute

Coordinated Universal Time (UTC) across a standard Ethernet network of

distributed devices. By time stamping in UTC events can easily be compared

across time zones without having to be adjusted for the geography in which they

were generated.

CIP Sync lets users base control on true time synchronization rather than the

more limited event synchronization model used historically. In a 100 Mbps

switched Ethernet system, advanced testing shows CIP Sync can deliver time

synchronization accuracy of less than 500 ns between devices, meeting the

requirements of some of the most demanding real-time applications.

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 75