CIP Sync Time Synchronization
CIP Sync™
time synchronization provides a mechanism to synchronize clocks between controllers, I/O devices, and other automation products in your architecture with minimal user intervention. CIP Sync™
uses Precision Time Protocol (PTP) to establish a Time Transmitter/ Time Receiver relationship among the clocks for each PTP-enabled component in the system. One clock, which is known as the Grandmaster, sets the clock to which all other devices on the network synchronize their clocks.Use Time Synchronization in a Redundancy System
The following considerations apply to time synchronization in a redundancy system:
- If you enable time synchronization for controllers in a redundant chassis pair, you must also enable time synchronization for one of the communication modules in the redundant chassis pair so that all devices have one path to the Grandmaster. To enable time synchronization for communication modules, change the Time Sync Connection from None (default) to Time Sync and Motion.If time synchronization is enabled for any controller in the primary chassis of a disqualified redundant chassis pair and no other device in the primary chassis has time synchronization enabled, the redundant chassis pair attempts to qualify. However, in these application conditions, the attempt to synchronize fails and the application remains in the qualifying state for up to 10 minutes before failing qualification. If viewed in the RMCT, the system status remains at 85% complete.
- While time synchronization can handle multiple paths between Time Transmitter and Time Receiver clocks, the most effective method is to configure the redundant paths so that time synchronization is enabled in only the minimum required number of communication modules. We recommend that time synchronization has exactly one path through the system with no loops.
Provide Feedback