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Motorized potentiometer in CoDeSys

Forum: Engineering 🇬🇧

Creator: razmis

Created: 2015-11-16

Updated: 2015-11-30

razmis - 2015-11-16

Is there a library that contains a function for motorized potentiometer?

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Originally created by: scott_cunningham

Here is a FB you can use where the input priority is (reset, inc, dec) (I only lightly tested it - so double check it):

FUNCTION_BLOCK MotorPot
VAR_INPUT
   Inc   : BOOL := FALSE;
   Dec   : BOOL := FALSE;
   Reset : BOOL := FALSE;
   Rate  : REAL := 0.1;
END_VAR
VAR_OUTPUT
   Cmd : REAL;
END_VAR
VAR CONSTANT
   MIN_CMD : REAL := -100.0;
   MAX_CMD : REAL := 100.0;
END_VAR
IF Reset THEN
   Cmd := 0.0;
ELSIF Inc THEN
   Cmd := MIN(Cmd + Rate, MAX_CMD);
ELSIF Dec THEN
   Cmd := MAX(Cmd - Rate, MIN_CMD);
END_IF

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