Typically, Sequence of Events (SoE) recording provides one millisecond resolution between input status changes. This is necessar for some rotating machinery or other rapid response trip devices. Often safety shutdown equipment provide SoE indication but with less resolution, perhaps 10 ms. With sequence of events it is easier to observe what caused a trip than simple first out alarming.
If you are looking for information, powerpoints, presentation materials, etc., a good source is your local safety system vendor/sales rep. Most safety systems that I have dealt with have SOE built-in, an integrated offering, with the data historian. They would be able to send you information about their offering.
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