FB_BA_FixedLimitCtrl

Function block for monitoring a fixed limit value.

The input bEn is used for enabling the function block.

A tolerance range is defined around the value rIn to be monitored.

The tolerance range results from an upper limit value rInHighLimit and a lower limit value rInLowLimit.

If the value rIn exceeds the upper limit value of the tolerance range, then the output bHighLimit becomes TRUE. A response delay of the output bHighLimit must be parameterized with the timer udiDelay_sec.

If the value rIn falls below the lower limit of the tolerance range, output bLowLimit becomes TRUE. A response delay of the output bLowLimit must be parameterized with the timer udiDelay_sec.

VAR_INPUT

bEn          : BOOL;
rHighLimit   : REAL := 32;
rLowLimit    : REAL := 16;
rIn          : REAL;
udiDelay_sec : UDINT;

bEn: Function block enable.

rHighLimit: Default upper limit value, preset to 32.

rLowLimit: Default lower limit value, preset to 16.

rIn: Input value to be monitored.

udiDelay_sec: Output response delay [s]. Internally limited to values between 0 and Const.udiTiSec.

VAR_OUTPUT

bHighLimit         : BOOL;
bLowLimit          : BOOL;
udiRemTiDelay_sec  : UDINT;

bHighLimit: Upper limit value reached.

bLowLimit: Lower limit value reached.

udiRemTiDelay_sec: Time remaining after a limit value has been exceeded until either the output bHighLimit or bLowLimit responds.

Requirements