Rockwell Automation 1756-IH16ISOE ControlLogix Sequence of Events Module - Manual (Page 145)

Publication 1756-UM528A-EN-P - April 2004
Using Module Tags D-11
Output Tags
Table D.7 describes the output tags generated in RSLogix 5000 when
you use the Sequence of Events module in FIFO Mode.
Table D.7 Output Tags in FIFO Mode
Tag name: Type: Description:
O.EventAck.x DINT Clears the current event data from the Sequence of Events module. To clear the current
event data, you must COP the current event number (I.EventNumber) to this tag.
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 Determines for which point the module returns events. You can use this bit to query
events by point instead of just sequence.
O.ResetEvents BOOL Erases all recorded events when transitioned from 0 to 1.
O.RetrieveByPoint BOOL Sets the retrieval mechanism for retrieving events.
0 = Retrieve events sequentially
1 = Retrieve events on a per point basis. In this case, the module uses the
PointtoRetrieve value to determine which input’s events are retrieved.