FB_BA_FixedLimitCtrl

This function block FB_BA_FixedLimitCtrl is used to monitor a fixed value.

A tolerance range is defined around the value fIn to be monitored.
The tolerance range results from an upper limit fHighLimit and a lower limit fLowLimit.

If the value fIn exceeds the upper limit value of the tolerance range, then the output bHighLimit is set. A response delay of the output bHighLimit can be parameterized with the time variable nDelay.

If the value fIn falls below the lower limit value of the tolerance range, then the output bLowLimit is set. A response delay of the output bLowLimit can be parameterized with the time variable nDelay.

If fLowLimit > fHighLimit, then internally fLowLimit is corrected to fHighLimit.

Inputs

VAR_INPUT
  bEn          : BOOL;
  fHighLimit   : REAL := 32;
  fLowLimit    : REAL := 16;
  fIn          : REAL;
  nDelay       : UDINT;
END_VAR

Name	Type	Description
bEn	BOOL	General enable of the function block. If bEn is FALSE, the message outputs bHighLimit and bLowLimit are also FALSE.
fHighLimit	REAL	Default upper limit.
fLowLimit	REAL	Default lower limit.
fIn	REAL	Input value to be monitored.
nDelay	UDINT	Response delay [s] of the outputs bHighLimit/bLowLimit. The input of the time is limited to the global parameter BAComn_Global.udiMaxSecInMilli from the Tc3_BA2_Common library (see BAComn_Global).

Outputs

VAR_OUTPUT
  bHighLimit         : BOOL;
  bLowLimit          : BOOL;
  nRemTiDelay        : UDINT;
END_VAR

Name	Type	Description
bHighLimit	BOOL	Upper limit value reached.
bLowLimit	BOOL	Lower limit value reached.
nRemTiDelay	UDINT	Remaining time after exceeding a limit value until one of the outputs bHighLimit or bLowLimit is set.

Requirements

Development environment	Required PLC library
TwinCAT from v3.1.4024.22	Tc3_BA2 from v5.2.5.0