Configures an analog input channel independent of the
 type of physical Ai-card. The conversion from signal
 value to actual value is done by means of a table.

 SigValue is converted to ActualValue via sensor
 function s, table t and filter function f according to,

 ActualValue = f ( t( s(SigValue) ) ) , where the choice of

 -- sensor function s, is determined by SensorTypeCode
 -- table t, is determined by SensorPolyType
 -- filter function f, is determined by FilterType in Ai object

 The table t is defined in one of the following ways:

 - Direct input of NoOfCoordinates pairs of numbers (InValue,O
   arranged in order of increasing InValue. The first
   and the last InValue specify the allowed interval of
   s(SigValue).
 - By specifying the coefficients PolCoefficients in a
   polynomial of maximum degree 7 and the maximum and
   minimum values of s(SigValue). By a menu procedure,
   not implemented, the interval between the minimum and
   maximum values will be divided into 29 equidistant
   intervals, which results in 30 s(SigValue)-values.
   Thereafter ActualValue of these points is calculated,
   and the pairs of numbers (InValue,OutValue) can be
   filled-in.

 In practice, the function t ( s(SigValue) ) will be put
 in by means of the menu handling. When the transfer
 function is defined, the Intercept(n) respectively
 Slope(n) for each point are decided by request; see
 figure above.
 In the target environment the following occurs with the
 SigValue:

 - If SigValuemin <= s(SigValue) >= SigValuemax , then
    - the index n is calculated as
              SigValue(n) = s(SigValue) < SigValue(n+1)
    - t( s(SigValue) ) = Intercept(n) + Slope(n)* s(SigValue)
 - otherwise, t( s(SigValue) ) = OutValue for the first
   or the last pair of numbers depending on
   s(SigValue) < s(SigValuemin) or s(SigValuemax) > s(SigValuemax)

 As the menu handling is not implemented yet we manually
 put in, for each NoOfCoordinates, the corresponding
 pair of numbers (InValue, OutValue ) respectively (Intercept, Slope).

 ChanAit objects are configured below a suitable card
 object.

• ChanAi

 Optional text, for example to describe the channel or
 its employment.

 Name of a signal object, i.e. Ai object, connected with
 the channel object.

 The identity of the channel. Optional, for example Ai0
 to denote the first channel, physical cable marking,
 etc.

 The Number attribute is used to associate the ChanAit
 object to a fixed channel on the card named by
 SigChanCon. The physical channels of the card are
 numbered in the interval {0,1, ... , (MaxNoOfChannels-1)},
 where MaxNoOfChannels is an attribute in the card
 object.
 The channels of the card are numbered according to the
 instructions of the card manufacturer.

 Specifies if the RawValue should be updated or not.
 FALSE means no updating; TRUE means RawValue should be
 updated at the period of ScanInterval.

 Specifies, in relation to the period T0, how often
 RawValue will be read in and converted to ActualValue.

 The IO job handles local Ai-signals by the period T0 =
 CycleTimeBus and remote signals by the period T0 =
 CycleTimeSerial; (see IOHandler).
 ScanInterval have to be >= 1.

 RawValue will be updated by the period: ScanInterval * T0

 Engineering unit for SigValue.

 The signal value can be adjusted by a sensor function
 before conversion to ActualValue. The possible types of
 sensor functions s are:

  -- 0    Normal case:  s(SigValue) = SigValue

 Specifies in which way SigValue will be converted to
 ActualValue. The possible types of conversions are:

  -- 0   No conversion:              t ( s(SigValue) ) = s(SigValue)
  -- 1   Conversion via table:   t ( s(SigValue) ) = table function( s(SigValue) )

 SigValue belong to the Ai object.

 The number of coordinates (InValue, OutValue ) in the
 table. At least 2 and maximum 30.

 s(SigValue).

 t ( s(SigValue) ).

 Offset.

 Slope. Intercept[n] and Slope[n] are associated with
 the point (InValue[n], OutValue[n]). n is the current
 coordinate.

 Polynomial coefficients to convert a sensor function of
 maximum seventh degree to a conversion table.

 Specifies if the table (InValue[n], OutValue[n]) has
 been created by means of a polynomial or if the
 coordinates have been written point by point. FALSE
 means a manual input operation, at which input and
 output values of every coordinate have been defined.
 TRUE means a table that has been created indirectly by
 a specified polynomial.

 Specifies when the table was last changed.

 Specifies who changed the table last.

 Specifies the data representation of the raw value.