Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 674)

L-force | PLC Designer
PLC Designer Libraries
672 DMS 3.2 EN 02/2011 TD29

Example in ST:
First of all ARRAY P must be defined in the header:
VAR
...
CHARACTERISTIC_LINE:CHARCURVE;
KL:ARRAY[0..10] OF POINT:=(X:=0,Y:=0),(X:=250,Y:=50),
(X:=500,Y:=150),(X:=750,Y:=400),7((X:=1000,Y:=1000));
COUNTER:INT;
...
END_VAR
Then we supply CHARCURVE with for example a constantly increasing value:
COUNTER:=COUNTER+10;
CHARACTERISTIC_LINE(IN:=COUNTER,N:=5,P:=KL);
The subsequent tracing illustrates the effect:
RAMP_INT
Provided by util.lib.
RAMP_INT serves to limit the ascendance or descendance of the function being fed:
The input consists on the one hand out of three INT values: IN, the function input, and
ASCEND and DESCEND, the maximum increase or decrease for a given time interval,
which is defined by TIMEBASE of the type TIME. Setting RESET to TRUE causes
RAMP_INT to be initialised anew.
The output OUT of the type INT contains the ascend and descend limited function
value.
When TIMEBASE is set to t#0s, ASCEND and DESCEND are not related to the time
interval, but remain the same.