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+====== FIRSTNZ() Function ======
+The FIRSTNZ() function (first non-zero) can be used to get the first value and timestamp for a variable above zero or a given threshold - it returns a human readable time, a value, or a combination of the two.
+Usage:
+''FIRSTNZ(variable, options, type, threshold_value)''
+**variable** - the variable name to check
+**options** - see below
+**type** - return type: 0 = value, 1 = time of first match, 2 = value + time of first match
+**val** - optional - threshold value to compare against (default is 0)
+===== Generic Variables (per device type) =====
+''FIRSTNZ('genset_on',1,1)''
+Get the first time that the genset_on variable was set today
+''FIRSTNZ('inverter_state',1,0,3)''
+Get the get the first inverter state that was above 3 today
+===== Device - Specific Variables =====
+For device specific variables use a . to separate the device name:
+''FIRSTNZ('My Device.My Value',1,2)''
+===== Option Parameters =====
+The second parameter, [options] is a number and can be any of the following
+|0 | Returns //No Change// |
+|1 | DAY - First time the variable changed during the day |
+|2 | WEEK - First time the variable changed during the week |
+|3 | MONTH - First time the variable changed during the month |
+|4 | YEAR - First time the variable changed during the current year |
+|5 | PERIOD - First time the variable changed during the  selected range |
+|6 | SLICE - First time the variable changed during the slice in the range (i.e. in a graph segment) |
+===== Example =====
+Get the first time the variable changed this week
+''FIRSTNZ('delta0_w',1,1,1500)''
+Returns the first time in the day that the value of delta0_w was greater than 1500

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