Counter like tag with cumulated value

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Then using this expression:
{[.]machineState} = "stopped" && !{[.]../shiftChange}
for lossFlag will make it false when shiftChange becomes true, then go back to its previous state when shiftChange goes back to false, with every counter reseted to 0.

Here's the json of my Test folder, you can copy and paste it in your tag browser

click for json 
{
  "name": "Test",
  "tagType": "Folder",
  "tags": [
    {
      "name": "Foo",
      "tagType": "Folder",
      "tags": [
        {
          "valueSource": "expr",
          "expression": "{[.]machineState} \u003d \"stopped\" \u0026\u0026 !{[.]../shiftChange}",
          "dataType": "Boolean",
          "name": "lossFlag",
          "value": false,
          "tagType": "AtomicTag"
        },
        {
          "valueSource": "expr",
          "expression": "secondsBetween({[.]lossFlag.timestamp}, now()) * toInt({[.]lossFlag})",
          "name": "currentStateTimer",
          "tagType": "AtomicTag"
        },
        {
          "valueSource": "expr",
          "expression": "if (!{[.]lossFlag},\r\n\t{[.]shiftLoss},\r\n\tcoalesce({[.]previousLoss}, 0)\r\n) * toInt(!{[.]../shiftChange})",
          "name": "previousLoss",
          "value": 0,
          "tagType": "AtomicTag"
        },
        {
          "valueSource": "memory",
          "dataType": "String",
          "name": "machineState",
          "value": "active",
          "tagType": "AtomicTag"
        },
        {
          "valueSource": "expr",
          "expression": "coalesce({[.]previousLoss}, 0) + {[.]currentStateTimer}",
          "name": "shiftLoss",
          "value": 227,
          "tagType": "AtomicTag"
        }
      ]
    },
    {
      "valueSource": "memory",
      "dataType": "Boolean",
      "name": "shiftChange",
      "value": false,
      "tagType": "AtomicTag"
    }
  ]
}

Note that it's probably not the best/simplest/easiest way of doing this. I just wanted to try and see if I could do it with expression tags only.

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