288 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 11 Develop Integrated Motion over an EtherNet/IP Network Application
Time Synchronization
Integrated Motion over an EtherNet/IP network requires Time Synchronization,
also known as CIP Sync. CIP Sync provides accurate real-time (real-world time)
or Coordinated Universal Time (UTC) synchronization of CompactLogix 5370
controllers and devices that are connected over an EtherNet/IP network.
CIP Sync is a time-synchronization protocol that can be applied to various
applications. This chapter focuses on using the protocol in applications with
Integrated Motion over an EtherNet/IP network.
In a CompactLogix system, the following devices are CIP Sync-capable:
• All CompactLogix 5370 controllers - Required
All controllers and communication modules must have time synchronization
enabled to participate in CIP Sync.
CIP Sync requires that devices in the system function in the following roles:
• Grandmaster, also known as the coordinated system time (CST) master -
Sets time for entire system and passes the time to a Master
• Master - Sets time for its backplane
• Slave - Uses time set by Master
While all CompactLogix 5370 controllers are CIP Sync-capable, not all
controllers support Integrated Motion over an EtherNet/IP network.
A controller must be CIP Sync-capable and synchronized with other
devices on the EtherNet/IP network to support Integrated Motion over
an EtherNet/IP network. However, the condition of being CIP
Sync-capable does not exclusively qualify a CompactLogix 5370
controller to support Integrated Motion over an EtherNet/IP network.
Table 37 on page 287
lists the CompactLogix 5370 controllers that
support Integrated Motion over an EtherNet/IP network.
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