metwally mustafa

i need to program a Ramp function via simatic manager as follow:

the function can perform ramp up or ramp down in addition the ramp up time in ramp down time

inputs to the function

1-ENABLE Bool

2-RAMP from Value REAL

3-RAMP to Value REAL

4-RAMP up time REAL

5-RAMP down time REAL

and outputs as follow

1-Processed value REAL

2-RAMP UP Bool Case

3-RAMP down BOOL case

4-Preset reached BOOL

i need the program with STL or LAdder and LADDER is necessary

[code]FUNCTION_BLOCK FB67

TITLE ='rate limiter'
AUTHOR : hdhosseini
VERSION : '1.0'



// Block Parameters
VAR_INPUT
// Input Parameters
input:REAL;
rst:BOOL:=false;
step:REAL:=0.1; //100ms call
factor:REAL:=1.0;
high:REAL:=100;
low:REAL:=0;
END_VAR

VAR_IN_OUT
// I/O Parameters
first:BOOL:=true;
END_VAR

VAR_OUTPUT
// Output Parameters
out:REAL;
END_VAR

VAR_TEMP
// Temporary Variables

END_VAR
VAR
// Static Variables
buffer:REAL:=0;
in:REAL;
END_VAR

// Statement Section

IF rst=true THEN
buffer:=0;
//first:=true;
out:=0;
in:=0;
;
ELSE
IF first= true THEN

buffer:=in;
first:=false;
END_IF;
IF input >= high THEN
in:=high;
END_IF;
IF input <= low THEN
in:=low;
END_IF;

IF (input > low) AND (input<high) THEN
in:=input;
END_IF;

IF in > (buffer+step) THEN
buffer:= (buffer+(step* factor));
END_IF;

IF in < (buffer-step) THEN
buffer:= (buffer-(step*factor));
END_IF;

IF in = buffer THEN
buffer:=in;


END_IF;
;
out:= buffer;
END_IF;

;
END_FUNCTION_BLOCK[/code]
and this is the sample project.
Attachment:rate_limiter.zip

Best regards,
Hamid Hosseini

metwally mustafa

thank you my friend

i will try the rate limiter program

can i use the rate limiter for a PID controller (FB41)

Yes, try useit in Setpoint branch

Best regards,
Hamid Hosseini