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Chapter 8
Specific Features of the 1732E-IB8M8SOER Sequence of Events Input Module
Timestamp Latching
Select this box to enable the
Timestamp Latching feature.
Unselect the box to disable
the feature.
Software-configurable Input
Filters
52
Timestamp Latching can be used to prevent the module from overwriting
input data once it is timestamped. This feature is available on the
1732E-IB8M8SOER input module.
•
If Timestamp Latching is enabled, the module timestamps an input in a
given direction and ignores future input transitions in that direction
until the controller acknowledges the timestamp data already received.
•
If Timestamp Latching is disabled, the module timestamps every input
transition and may overwrite previously recorded timestamp data if the
controller does not acknowledge the data quickly enough.
This feature is set on a module-wide basis and is enabled by default. It works in
both FIFO and Per Point modes.
Use the Configuration tab in Studio 5000 Logix Designer software to enable
Timestamp Latching, as shown in
Figure 11 - Enable Timestamp Latching
To account for hard contact bounce, you can configure ON to OFF and OFF to
ON input filter times in Studio 5000 Logix Designer software for your module.
These filters define how long an input transition must remain in the new state
before the module considers the transition valid.
IMPORTANT Input filters are applied to all inputs on the module. You cannot apply input
filters to individual inputs on the module.
When an input transition occurs, the module timestamps the transition on the
initial edge of the transition and stores data for the transition on-board; the
module then scans the input where the transition occurred every millisecond
for the length of the filter time setting to verify that the input remains in the
new state (remained OFF or ON).
•
If the input remains in the new state for a time period equal to the filter
time setting, the module sends data for the transition to the controller.
When an input transition is detected, the module counts the number of
1 ms intervals the input is in the new state until the count reaches the
filter value.
•
If the input changes state again (returns to the original state) before the
length of time of the filter setting has elapsed, the module starts
Rockwell Automation Publication 1732E-UM003D-EN-E - November 2021
Figure
11.
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