Add-On Instruction

posted Jul 2, 2011, 9:46 AM by Darren Ash   [ updated Jul 2, 2011, 7:14 PM ]
Have posted a more advanced version, EST.zip, that utilizes the same Control structure that you use with a FIFO Load / Unload pair.  This will allow you to delete an element in the middle of an array, but keep the Control.POS value set to the correct location.  This one I titled EST for Extract Stack.  Latter I will add a LST for Load Stack so that an element can be loaded anywhere in the array structure.

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This Add-On was created in V19.  It will allow you to select an element within an array, that element will be copied to a destination and then the elements below it will be moved up to fill in.  The last element in the array will then be written to 0.  The add-on is attached below as ArrayShift.zip.



The main logic resembles:

/*If routine has completed previously then exit routine*/

IF DN THEN
TND();
END_IF;

/* Retrieve the size of the incomming array */
SIZE(ArrayIn,0,ArraySize);

/*Validate requested position to remove*/
IF (Position >= 0) AND (Position <= ArraySize-1) AND (ArraySize>1) THEN
ER:=0;
/*Set destination data to extract array element*/
Destination:=ArrayIn[Position];
/*Calculate the array positions to operate on*/
CopyStart:=Position+1;
CopyLength:=ArraySize-(Position+1);
ClearStart:=10;
/*Validate there is something to copy*/
IF CopyLength >0 THEN
CPS(ArrayIn[CopyStart], ArrayIn[Position], CopyLength);
ArrayIn[ArraySize-1]:=0;
ELSIF CopyLength = 0 THEN
ArrayIn[ArraySize-1]:=0;
END_IF;

DN:=1;

ELSE
ER:=1;
END_IF;

ċ
ArrayShift.zip
(2k)
Darren Ash,
Jul 2, 2011, 9:48 AM
ċ
EST.zip
(2k)
Darren Ash,
Jul 2, 2011, 7:09 PM
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