Rockwell Automation 1732E-IB16M12SOEDR EtherNet/IP ArmorBlock supporting Sequence of Events - Manual (Page 15)

Publication 1732E-UM002A-EN-P - March 2010
Module Overview 7
CIP Sync Support
CIP Sync supports the IEEE 1588-2008 synchronization standard. In this
architecture, a grandmaster clock provides a master time reference for the
system time. The 1732E-IB16M12SOEDR module is a CIP Sync slave only
device. There must be another module on the network that will function as a
master clock. The grandmaster could be:
• a 1756 ControlLogix L6 or L7controller when using RSLogix 5000
software V18 or later.
• an Ethernet switch that supports IEEE 1588 V2, or
• a Symmetricom Grand Master GPS or equivalent.
What is CIP Sync?
CIP Sync is a CIP implementation of the IEE 1588 PTP (Precision Time
Protocol). CIP Sync provides accurate real-time (Real-World Time) or
Universal Coordinated Time (UTC) synchronization of controllers and devices
connected over CIP networks. This technology supports highly distributed
applications that require time stamping, sequence of events recording,
distributed motion control, and increased control coordination.
What is Time Stamping?
Each input has its own individual timestamp recorded for both ON and OFF
transitions. The offset from the timestamp to the local clock is also recorded
so that steps in time can be detected and resolved. Diagnostic events such as
short circuit, open wire and open load are not time stamped.
Time stamping uses the 64-bit System Time whose time base is determined by
the modules master clock resolved in microseconds. Each timestamp is
updated as soon as an input transition is detected, before input filtering occurs.
When filtering is enabled, the transition is only recorded if the transition passes
the filter.
The module starts time stamping as soon as it powers up, even if it is not
synchronized to a master clock. If it is synchronized to a master clock and then
becomes unsynchronized it will continue to time stamp. All time stamps and
offsets have a value of zero at power-up.
For more information on how to use CIP Sync technology, see the Integrated
Architecture and CIP Sync Configuration Application Technique publication
IA-AT003 .