One condition: triggers when the field is changed to 

				
					{
    "blockOptions": {
        "method": {
            "args": {
                "device": "device",
                "armed": "armed"
            },
            "name": "isDeviceState"
        }
    },
    "blockType": "when",
    "fields": [
        {
            "name": "device",
            "type": "device",
            "value": "deviceId"
        },
        {
            "name": "armed",
            "type": "bool",
            "value": true
        }
    ]
}