Switches can be monitored on the SA380 TX using digital inputs and analogue channels. With the SA380 TX and SA380 TX-L, this is done using the "trigger capture" mechanism. This data capture method can be applied to any data collection which starts from a known event, such as a relay picking, or a current measurement rising above a pre-determined threshold. The idea behind the trigger capture is to allow a generic configuration for any type of asset where analogue data needs to be captured at maximum sample rate. To this end, the mechanism is open to may uses other than switch monitoring. The general trigger capture consists of the following phases:two triggers (start and stop) and three data capture phases (pre, during and post), which the following points trace can illustrate:
There are several common combinations of switches that are configured. The following examples illustrate these:
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