Statement List (STL) - DCE FEL ČVUT v Praze

Statement List that Activates the Indicator Lamps on the Display Panel
Programming Examples
STL Explanation
A I 0.0 //Each pulse generated by photoelectric barrier 1
CU C1 //increases the count value of counter C 1 by one, thereby counting the number
of packages going into the storage area.
//
A I 0.1 //Each pulse generated by photoelectric barrier 2
CD C1 //decreases the count value of counter C 1 by one, thereby counting the
packages that leave the storage area.
//
AN C1 //If the count value is 0,
= Q 4.0 //the indicator lamp for "Storage area empty" comes on.
//
A C1 //If the count value is not 0,
= A 4.1 //the indicator lamp for "Storage area not empty" comes on.
//
L 50
L C1
=I //If the count value is greater than or equal to 90,
= Q 4.3 //the indicator lamp for "Storage area 90% full" comes on.
//
L Z1
L 100
>=I //If the count value is greater than or equal to 100,
= Q 4.4 //the indicator lamp for "Storage area filled to capacity" comes on. (You could
also use output Q 4.4 to lock conveyor belt 1.)
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 B-11