Rockwell Automation 1732E-IB16M12SOEDR EtherNet/IP ArmorBlock supporting Sequence of Events - Manual (Page 16)

Publication 1732E-UM002A-EN-P - March 2010
8 Module Overview
Introduction to Sequence of
Events modules The 1732E-IB16M12SOEDR is an input module that offers sub-millisecond
timestamping on a per point basis in addition to providing the basic ON/OFF
detection.
All input point event times are recorded and returned in a single buffer. The
module returns two 64-bit timestamps for each input point, thus allowing:
• ON and OFF events for each point to be displayed simultaneously in
the input data.
• ladder logic not being explicitly required to see events, although needed
to archive events.
• events to be kept in the controller memory during remote power loss
thus eliminating data loss.
Filtering allows all inputs on the module to be filtered for both ON to OFF
and OFF to ON transitions. The timestamp for a filtered input will be the time
of the initial transition to the new state and not the time that the filter validates
the event as real.
Selective Event Capturing allows particular events to be disabled per input and
per transition, ON to OFF or OFF to ON.
Event latching ensures that events are not overwritten. A single transition in
each direction is recorded per point. Any new event, which occurs after the
point has captured a time stamp, is dropped until the stored events have been
acknowledged.
If latching is not enabled, new events overwrite old events immediately. Thus,
if inputs are changing rapidly it may be possible that events will be lost either in
the module or the controller prior to an event being operated on by ladder
logic.
When events are lost, either old ones being overwritten or new ones being
ignored due to latching, an EventOverflow bit will be set for each point that
loses an event. The EventOverflow bit will clear when the blocking events for
that point are acknowledged.
Timestamping is a feature that registers a time reference to a change in input
data. For the 1732E-IB16M12SOEDR, the time mechanism used for
timestamping is (PTP) system time. The 1732E-IB16M12SOEDR module is a
PTP slave only device. There must be another module module on the network
that will function as a master clock.