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PROGRAM PRG
VAR
	xDI0 : BOOL;
	xDI1 : BOOL;
	xDI2 : BOOL;
	xDI3 : BOOL;
	byDI : BYTE;
	
	wIn0 : WORD;
	wIn1 : WORD;
	xDO1 : BOOL;
	xDO2 : BOOL;
	xDO3 : BOOL;
	xDO0 : BOOL;
	byDO : BYTE;
	wOut0 : WORD;
	wOut1 : WORD;
	byLED : BYTE := 0;
	byControlByte : BYTE := 255;
END_VAR
// on purpose;
xDI0;
xDI1;
xDI2;
xDI3;
wIn0;
wIn1;
xDO0 := xDI0;
xDO1 := xDI1;
xDO2 := xDI2;
xDO3 := xDI3;
byDO := byDI;
wOut0 := wIn0;
wOut1 := wIn1;
byLED := byLED +1;
IF byLED > 255 THEN
	byLED := 0;
END_IF
byControlByte := byControlByte -1;
IF byControlByte < 0 THEN
	byControlByte :=  255;