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...More see http bin com siemens training plc programming examples htm following is the counter logic step by explained with significance of each input first open simatic manager software as shown below diag daig then double click on fc function block and file appears in line network after this goto left side where it shows various features or instruction folder such bit comparator etc exactly will show number types s cu up appear over similarly for cd down cud type c every these counters are assigned names tag operation above performs let us learn example lamps turned count can be understood from diagram connected to real world i which reads when a lamp turns now consider here all reset starts counting again focus get understanding...