FB_BA_RampLmt

Functional description

The function block limits the increase or decrease speed of an input signal.
An increase of rIn results in the output rOut to be limited to the slope of (rHi-rLo)/udiTiUp.
A decrease of rIn results in the output rOut to be limited to the slope of (rHi-rLo)/udiTiDwn.

VAR_INPUT

bEn         : BOOL;
bEnRamp     : BOOL;
rIn         : REAL;
rHi         : REAL;
rLo         : REAL;
udiTiUp     : UDINT;
udiTiDwn    : UDINT;

bEn: enable function block if FALSE, then rOut = 0.0

bEnRamp: enable ramp limit, if FALSE, then rOut = rIn.

rIn: input value of the ramp function

rHi: upper interpolation point for calculating the ramps.

rLo: lower interpolation point for calculating the ramps. rHi must be greater than rLo, otherwise an error is output!

udiTiUp: rise time [s]

udiTiDwn: fall time [s]

VAR_OUTPUT

rOut        : REAL;
bErr        : BOOL;
udiErrId    : UDINT;
udiErrArg   : UDINT;

rOut: Output signal, slope-limited through the ramps

bErr: This output is switched to TRUE if the parameters entered are erroneous.

udiErrId / udiErrArg: Contains the error number and the error argument. See Error codes.

Requirements