Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 140)

Publication 1756-UM528A-EN-P - April 2004
D-6 Using Module Tags
Output Tags
Table D.4 describes the output tags generated in RSLogix 5000 when
you use the Sequence of Events module in CST Per Point Mode.
Table D.4 Output Tags in CST Per Point Mode
Tag name: Type: Description:
O.EventAck DINT To acknowledge reset of event, the controller writes back the EventNumber read to
transition buffers in Queuing mode or to unlatch events in 16-point mode.
0 = acknowledging an ON to OFF event
1 = acknowledging an OFF to ON event
2 = acknowledging both ON to OFF and OFF to ON events
The NewData tag must also be used to acknowledge the event(s).
O.NewDataAck.x DINT Allows NewData bits in the Input word to function as intended. NewData bits are
set when a transition occurs and clear only after they are acknowledged via the
NewDataAck bit. Typically, the following events occur:
• An event occurs on an input.
• The Sequence of Events module sets the NewData bit for the input where the
event occurred.
• The controller records the new data.
• The controller acknowledges the new data by causing a 0 to 1 transition on
the corresponding NewDataAck bit.
• The NewData bit clears.
• When another event occurs on the input, the sequence begins at the top
bullet in this list.
The controller must cause a 0 to 1 transition in this bit to acknowledge new data for
an input; in other words, if the NewDataAck bit is 0 when new data is received, the
controller must change this bit to 1 to acknowledge the data. If NewDataAck bit is 1
when new data is received, the controller must change this bit to 0 and then to 1 to
acknowledge the new data.
O.PointToRetrieve INT Not used in this mode
O.ResetEvents BOOL Erases all recorded events when transitioned from 0 to 1. Resets most other fields to 0
as well.
O.RetrieveByPoint BOOL Not used in this mode