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ST coding and Initial Value of Var
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federico.furlani:
Hi everybody,
I'm struggling with using the ST code on Guide. In particular, my problem of the day is to initialize a retain Var.
How can I access the 5 as Initial Value?
Thanks
FluidPowerTom:
I do this programmatically by having another variable function as a sort of default-setting flag:
FUNCTION_BLOCK BrakeLogic
VAR_INPUT
BrakeTimerSetting2 : USINT;
SetDefault : BOOL;
SaveChanges : BOOL;
END_VAR
VAR_OUTPUT
BrakeTimerSetting : USINT;
END_VAR
VAR
startup : BOOL;
END_VAR
VAR RETAIN
BrakeTimer : USINT;
NVMem_Init : UDINT;
END_VAR
-----------------------------------------------------------------
IF SetDefault OR NVMem_Init<>666666 THEN
BrakeTimerSetting:=0;
BrakeTimer:=0;
NVMem_Init:=666666;
END_IF
IF NVMem_Init=666666 AND NOT startup THEN
BrakeTimerSetting:=BrakeTimer;
startup:=1;
END_IF
IF SaveChanges AND NVMem_Init=666666 THEN
BrakeTimer:=BrakeTimerSetting2;
BrakeTimerSetting:=BrakeTimerSetting2;
END_IF
EDIT: As you'll see in this case I'm using a variable named NVMem_Init for that, and we initialize the BrakeTimer as 0.
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