The basics of counting, measurement and position detection This section contains information on the following topics:Overview of modules and properties (S7-1500)Basics of counting, measuring and position input (TM Count, TM PosInput, Compact CPU) (S7-1500)Basics of counting (TM Timer DIDQ) (S7-1500)Basics of counting (digital modules) (S7-1500)Basics of counting (SIMATIC Drive Controller) (S7-1500)