Positioner.

 The positioning is carried out, without any hysteresis,
 by the output signals Order1 and Order2.
 One of two operating modes, MANUAL / AUTO, is selected
 by means of the output signal ManMode in the following
 way:

 The MANUAL mode is thought to be handled from the object's display.

 * A set point value is set in SetPos.
 * The positioning is started by setting PosOn to TRUE.
 * The positioning is finished of different reasons:

 - the process value has been within the dead-zone intervals,
    i.e. the target range, during a time specified by TimerTime.

 - PosOn becomes FALSE.

 - (the input signal) Reset becomes TRUE.

 The positioning starts on a leading edge on the input signal AutoPos.
 It can be finished of different reasons:
 - TimerTime > 0. The process value has been within the dead zone
   intervals, i.e. the target range, during a time specified by TimerTime.
   A new positioning process is triggered by a leading edge on AutoPos,
   i.e. not because PosVal is outside the target range.

 - TimerTime = 0. The positioning is never finished but continues to
   follow SetPos until Reset becomes TRUE.

 - (the input signal) Reset becomes TRUE.

Example

 By means of a push button the positioning starts, and the carriage runs
 to a set point value set by a potentiometer. The positioning is to be
 interrupted after 5 seconds in the 'target' range.

 Position Control

 The direction of the carriage is directed by Order1 or Order2 and the
 speed by an analog reference. The speed ought to be slow near the set
 point value and this is done by a lower value of the reference.

 Specifies process value of the position.

 Specifies set point of the position disregarding mode.
 A connected input signal is read only in AUTO mode. It
 means that it is possible to write in the attribute at
 MANUAL mode without any interference from an outer
 signal.

 Specifies a start positioning request in operational
 mode AUTO. FALSE has no meaning. The transition FALSE
 -> TRUE means start positioning request and, if Reset
 is FALSE, PosOn becomes TRUE and the positioning
 starts.

 Specifies a stop positioning request disregarding the
 mode. FALSE has no meaning; TRUE means a stop
 positioning request and prevents any further
 positioning as long as it is set.

 Specifies required operational mode, MANUAL or AUTO.
 Used as an ordinary parameter, e.g. it may be written
 into from display programs. The advantage of placing
 this attribute as an output is that it will be easier
 to use it in the graphic configuration.

   FALSE -- required operational mode is AUTO
   TRUE  --    -  "  -              MANUAL

 Specifies if positioning continues or not. FALSE means
 no positioning at the moment and TRUE means that
 positioning is running. In MANUAL mode the positioning
 is started, if Reset is FALSE, by setting PosOn to
 TRUE, and it can be stopped by setting PosOn to FALSE.

 This operational order specifies a backward order, i.e.
 towards less PosVal. FALSE means no backward order, and
 TRUE means a backward order as long as PosOn is TRUE
 and PosVal > SetPos + DeadZone1.

 This operational order specifies a forward order, i.e.
 towards greater PosVal. FALSE means no forward order
 and TRUE means a forward order as long as PosOn is TRUE
 and PosVal < SetPos - DeadZone2.

 Specifies if PosVal is in the 'target' range or not.
 FALSE means no and TRUE means that the answer is yes.

 Specifies the position error (= PosVal - SetPos). It is
 calculated continuously.

 The values, which have to be >= 0, specify the lower and
 the upper end in the 'target' range.

 The values, which have to be >= 0, specify the lower and
 the upper end in the 'target' range.

 Points to the next element in the timer queue.

 Number of remaining ticks.

 Points to a Do or Dv object or, if these are not used,
 to TimerDoDum. After a time of TimerTime the signal
 specified by TimerDo is cleared.

 Specifies the time, in seconds, during which the PosVal
 has to be in the 'target' range to interrupt the
 positioning. See above.

 Dummy. If TimerDoDum does not point to a Do or Dv
 object it points to this attribute.

 Identity of this object is set at load file creation.
 Used by the run time system.

 The operator's authorities to change TimerTime can be
 restricted. Not implemented.

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

 Specifies a valid interval at changes made by the
 operator on TimerTime.

 TimerMin <= TimerTime <= TimerMax