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Chapter 10
Use the Sequence of Events Input and Scheduled Output Modules
Select this box to enable the
Timestamp Latching feature.
De-select the box to disable
the feature.
62
Use Timestamp Latching
When enabled, timestamp latching prevents the module from overwriting
recorded timestamp data once a transition occurs. This feature is set on a
module-wide basis and is enabled by default. The following table describes
how Timestamp Latching affects the module.
Table 8 - Timestamp Latching
If Timestamp Latching
is:
Enabled
Disabled
(1) This table assumes the transition occurs on inputs that have Timestamp Capture enabled. If Timestamp Capture is disabled, the
module does not timestamp transitions on that input and, therefore, Timestamp Latching does not affect module behavior.
IMPORTANT We suggest you monitor the I.EventOverflow bits to make sure you are
aware of transitions that were either not timestamped or when timestamp
data was overwritten.
Use the Configuration tab in Studio 5000 Logix Designer software to enable
Timestamp Latching on the 1732E-IB8M8SOER, as shown in the example.
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
(1)
the following occurs
The module timestamps two transitions for each input–one for OFF to ON and one for ON to
OFF. If similar transitions occur on inputs where a transition has already been timestamped
and the data was not yet acknowledged (for more information on Acknowledge Timestamp
Latching Timestamp Data, see
page
70), the module does not timestamp the new transition.
When a transition is not timestamped, the module sets the I.EventOverflow tag for that
point to inform the controller that an input transitioned but a timestamp was not produced
for the transition.
By default, Timestamp Latching is enabled.
The module timestamps each transition for each input as it occurs. In this case, when
multiple transitions occur in the same direction on the same input, the module records the
new timestamp data, overwriting any previously-recorded data which had yet to be
acknowledged (for more information on Acknowledge Timestamp Latching Timestamp
Data, see
page
70).
When the module overwrites data, it sets the I.EventOverflow tag for that point to inform the
controller that events have been overwritten.
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