Points view parameters (input)

The
Points
view includes these parameters:
Parameter
Description
Enable COS / Timestamp
Enables the Change of State for the HIGH to LOW (On -> Off) transition or the LOW to HIGH (Off -> On) transition for each input point. Selecting a checkbox also enables timestamping. The timestamp is the time that data changed.
  • When selected, data is produced from the input device cyclically at the RPI and also immediately upon change of state for this point.
  • When cleared, data is only produced from the input device cyclically at the RPI for this point, and timestamping is disabled for this transition.
Enable Filter
Enables the input filter for each input point.
Input Filter Time
Determines the input filter times for each input point group.
  • OFF to ON delay time
  • ON to OFF delay time
This filter is used to filter out noise spikes that may have passed through the hardware circuitry. When an input transition occurs, the device timestamps the transition on the initial edge of the transition and stores data for the transition. The device then scans the input every 25 µs for the duration of the filter time to verify that the input remains in the new state.
  • If the input remains in the new state for a time period equal to the filter time setting, the device sends data for the transition to the controller.
  • If the input changes state again before the duration of the filter time has elapsed, the device continues to scan that input for up to 10X the filter setting. During this continued scan period, one of these events occurs:
    • At some point in the time period that is 10X the duration of the filter time, the input returns to the transitioned state and remains there for a length of time equal to the filter time. In this case, the device sends data from the transition to the controller.
    • In the time period that is 10X the duration of the filter time, the input never remains in the transitioned state for the duration of the filter time. In this case, the device does not consider the original transition valid and drops the timestamp.
A pair of Off -> On and On -> Off filters work for a group of 16 input points.
One filter time is common for each group of input points.
Latch Timestamps
Latches all COS transitions so that an event is not overwritten without being acknowledged. For instance, in 16-channel mode, in a sequence of events from OFF to ON to OFF, the first OFF and ON transitions are recorded, while the final OFF transition is ignored. All subsequent transitions on that point are ignored until acknowledged or reset.
If this checkbox is cleared, then the second OFF transition in the example above overwrites the first OFF transition immediately, even if the controller has not yet extracted the data.
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