Compares an analog value (signal or parameter) with a
 low limit.

 Both the input signal and the limit can be either
 constants, defined by the Attribute Editor, or ordinary
 analog signals.

 The output is TRUE when the input signal is less than
 the low limit, i.e. Lim.

 The hysteresis is taken into account when the output
 signal is to be FALSE. The output becomes FALSE as soon
 as the input becomes greater than or equal to the low
 limit plus the hysteresis.

• Comph

 The value that will be compared with the limit.

 Specifies the low limit. The value may be dynamic or
 static.

 The flag specifies if In is less than the low limit or
 not. FALSE means that In exceeds the limit; TRUE means
 that In is below the limit or has exceeded the limit
 but does not get a level, in according to the
 hysteresis, where the flag is to be reset.

 Specifies the hysteresis. A value < 0 is not valid.

 The operator's authorities to change Lim. There is no
 meaning in changing the attribute manual, if this has
 also been updated by an external signal.

  0   -- Changes not allowed.
  !=0 -- Changes allowed.

 The minimum and maximum allowed value of Lim at changes
 made by an operator.

 The operator's authorities to change Hysteres.

 Smallest ( >= 0) respectively highest allowed value of
 Hysteres at changes made by the operator.