Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM - Manual (Page 18)

8 Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014
Chapter 2 Module Overview and Features
only devices. There must be another module on the network that will function as
a master clock. The grandmaster could be:
• a 1756 ControlLogix L6 or L7 controller when using RSLogix 5000
software v18 or later.
• an Ethernet bridge 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 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 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.
Timestamping 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 timestamping 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 continues 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 .
Introduction to the
Sequence of Events Input
Module The 1732E-IB8M8SOER is an input module that offers sub-millisecond
timestamping on a per point basis in addition to providing the basic ON/OFF
detection. It supports two modes of operation: Per Point Mode and FIFO (First
In First Out) Mode. To learn more about using the modules in these modes of
operation, see Operational Modes on page 68.