Rockwell Automation 1732E-IB16M12SOEDR EtherNet/IP ArmorBlock supporting Sequence of Events User Manual
Page 55
Publication 1732E-UM002A-EN-P - March 2010
Module Features 47
– At some point while still filtering the input, the input returns to the
transitioned state and remains there until the module counts the
number of 1 ms intervals equal to the filter setting. In this case, the
module sends data from the transition to the controller.
– The input does not remain in the transitioned state for a time period
equal to the filter setting and the 1 ms counter decrements to zero. In
this case, the module does not consider the original transition valid
and drops the timestamp.
The following example illustrates how the module’s input filters operate.
In the example, a module:
•
is Timestamp Capture-enabled for all of its points
•
uses a 2 ms input filter setting for OFF to ON transitions
Three possible scenarios can result after an input transitioning from OFF to
ON in the given circumstances.
•
Scenario #1 (no bounce) – The input turns ON and remains for the full
2 ms. In this case, the module considers the transition valid and sends
the data recorded at the transition to the controller.
Note the input was sampled as being on three different times: 0 ms,
1 ms and 2 ms.
0
1
2
3
4
5
6
7
8
Input turns ON;
timestamp recorded
Time in milliseconds
Input remains ON for at least 2 ms; transition is considered
valid and the timestamp is sent to the controller
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