ABB ACSM1 Firmware Manual page 273

Operation The output (Y) at the value of the input (X) is calculated with linear interpolation from
a piecewise linear function.
Y = Y
k
The piecewise linear function is defined by the X and Y vector tables (XTAB and YTAB).
For each X-value in the XTAB table, there is a corresponding Y-value in the YTAB table.
The values in XTAB and YTAB must be in ascending order (i.e. from low to high).
XTAB and YTAB values are defined with the DriveSPC tool.
Interpolated Y
The balancing function (BAL) permits the output signal to track an external reference
and gives a smooth return to the normal operation. If BAL is set to 1, output Y is set to
the value of the balance reference input (BALREF). The X value which corresponds to
this Y value is calculated with linear interpolation and it is indicated by the balance
reference output (BALREFO).
If the X input is outside the range defined by the XTAB table, the output Y is set to the
highest or lowest value in the YTAB table and the ERROR output is set to 1.
If BALREF is outside the range defined by the YTAB table when balancing is activated
(BAL: 0 -> 1), the output Y is set to the value of the BALREF input and BALREFO output
is set to the highest or lowest value in the XTAB table. (ERROR output is 0).
ERROR output is set to 1 when the number of the XTAB and YTAB inputs are different.
When ERROR is 1, the FUNG-1V block will not function. XTAB and YTAB tables are
defined in the
Inputs The input data type is selected by the user.
X value input (X): DINT, INT, REAL, REAL24
Balance input (BAL): Boolean
Balance reference input (BALREF): DINT, INT, REAL, REAL24.
X table input (XTAB): DINT, INT, REAL, REAL24
Y table input (YTAB): DINT, INT, REAL, REAL24
Outputs Y value output (Y): DINT, INT, REAL, REAL24
Balance reference output (BALREFO): DINT, INT, REAL, REAL24
Error output (ERROR): Boolean
+ (X - X )(Y - Y ) / (X
k k+1 k k+1
Y4
Y3
Y2
Y1
X1
DATA CONTAINER
- X )
k
X2 X3 X4
X
block (on page 272).
273
X table Y table
(XTAB) (YTAB)
X1 Y1
X2 Y2
X3 Y3
... ...
X9 Y9
Standard function blocks