A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. block - Limit the ascendance or descendance of a signal
Inputs
IN : REAL Input signal
ASC : REAL Maximum
ascendance during time base
DSC :
REAL Maximum descendance
during time base
TM :
TIME Time base
RST :
BOOL Reset
Outputs
OUT : REAL Ramp signal
Time diagram
Remarks
Parameters are not updated constantly. They are taken into account when only:
- the first time the block is called
- when the reset input (RST) is TRUE
In these two situations, the output is set to the value of IN input.
ASC and DSC give the maximum ascendant and descendant growth during the TB time base. Both must be expressed as positive numbers.
In FFLD language, the operation is executed only if the input rung (EN) is TRUE. The output rung (ENO) keeps the same value as the input rung.
ST Language
(* MyRamp is a declared instance of RAMP function block *)
MyRamp (IN, ASC, DSC, TM, RST);
OUT := MyBlinker.OUT;
FBD Language
FFLD Language
(* The function is executed only if EN is TRUE *)
(* ENO keeps the same value as EN *)
IL Language
(* MyRamp is a declared instance of RAMP function block *)
Op1: CAL MyRamp (IN, ASC, DSC, TM, RST)
FFLD MyBlinker.OUT
ST
