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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 := 0;
	wOut1 : WORD := 0;
	byLED : BYTE := 0;
	byLedMask : BYTE := 0;
	byControlByte : BYTE;
END_VAR
wOut0 := wOut0 + 1;
wOut1 := wOut0;
IF wOut0 > 4096 THEN
	wOut0 := 0;
END_IF
IF byLedMask > 0 THEN
	byLED := byLED +1;
	IF byLED > 255 THEN
		byLED := 0;
	END_IF
byControlByte := 3;