====== 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