While Loop for reading values

[admin]

In this example each fault object has the next middle group (shift = 256, 1/1/123 => 1/2/123). Change as needed, shift can be negative.

Code:

function tag_max(tag, shift)
  local objects = grp.tag(tag)
  local result = -math.huge

  for _, object in ipairs(objects) do
    local fault = grp.getvalue(object.id + shift)
    if not fault then
      result = math.max(result, object.value)
    end
  end

  return result
end

max = tag_max('my_tag_name', 256)
log(max)