ABB DCS550 - Arithmetical Function; Function Blocks

120
AP
3ADW000379R0501 DCS550 Manual e e
Function blocks
General
Each of the 16 function blocks has three input parameters IN1 to IN3. It is possible to connect them to the
firmware, outputs of other function blocks or constants. Boolean values are interpreted like this:
− 1 as true and
− 0 as false.
A 4
th
parameter is used for the attributes of the inputs. Manually set this attribute, if the functions blocks are
edited with the DCS Control Panel or DWL. The attribute is set automatically when DWL AP is used. The
output OUT can connected with the inputs of function blocks. To write output values into firmware parameters
connect the necessary output pointer (group 86) to the desired parameter.
Function
block
-
Illustration
ABS
Arithmetic
al function
Illustration
Operation
OUT is the absolute value of IN1 multiplied by IN2 and divided by IN3.
OUT = |IN1| * IN2 / IN3
Connections
IN1, IN2 and IN3: 16 bit integer (15 bit + sign)
OUT: 16 bit integer (15 bit + sign)
ADD
Arithmetical function
Illustration
Operation
OUT is the sum of the inputs.
OUT = IN1 + IN2 + IN3
Connections
IN1, IN2 and IN3: 16 bit integer (15 bit + sign)
OUT: 16 bit integer (15 bit + sign)