CIP Sync Time

I/O modules use CIP Sync for timestamps. CIP Sync is a CIP implementation of the IEEE 1588 PTP (Precision Time Protocol). CIP Sync provides accurate real-time (Real-World Time) or Universal Coordinated Time (UTC) synchronization of controllers and devices that are connected over CIP networks. This technology supports highly distributed applications that require timestamping, sequence of events recording, distributed motion control, and increased control coordination.
These modules are CIP Sync slave-only devices. There must be another module on the network that functions as a master clock.
I/O modules can be used to capture timestamps. The advantage is that CIP Sync is system-wide, so timestamp values are consistent across all modules in the system.
IMPORTANT:
I.CIPSyncValid
 = 1 is not sufficient for an application to confirm that the module is ready for application requiring a system time synchronization to start operation. See Grandmaster Clock Verification for extra verification needed.

Grandmaster Clock Verification

The application must verify that the module is synchronized with the same Grandmaster Clock as the owner-controller.
If Status connection is selected in the PointMax EtherNet/IP adapter Device Definition dialog, verify that all following conditions are true:
  • I/O module's
    I.CipSyncValid
     is 1
  • Adapter's
    S.CipSyncValid
     is 1
  • Adapter's
    S.GrandmasterClockID
     is the same as the controller's GrandMasterClockID
If Status connection is not selected in the PointMax EtherNet/IP adapter Device Definition dialog, verify that all following conditions are true:
  • I/O module's
    I.CipSyncValid
     is 1
  • I/O module's
    GrandmasterClockID
     in GrandMasterClockInfo attribute of TimeSync object is the same as the controller’s
    GrandmasterClockID
    • Class: 0x43
    • Instance: 0x01
    • Attribute: 0x08
    • Response: GrandMasterClockInfo (See the structure below)
      GrandMasterClockInfo
      STRUCT of
      ClockIdentity
      USINT[8]
      ClockClass
      UINT
      TimeAccuracy
      UINT
      OffsetScaledLogVariance
      UINT
      CurrentUtcOffset
      UINT
      TimePropertyFlags
      WORD
      TimeSource
      UINT
      Priority1
      UINT
      Priority2
      UINT
To get controller's GrandMasterClockID, access the TIMESYNCHRONE object through the GSV instruction. See Access the TimeSynchronize object.
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