ABSTRACT
Counters are very often used in the design of state machines. A counter may be forced to increment or decrement its counting register by commands (actions) or it may count some events. Therefore the RTDB has several counter types, which simplify certain control problems. Counting itself is normally of no relevance in guiding the control. The only interesting moment is when a certain counting value, called an
expiration value,
is reached. The simplest counter is represented by an object
CNT
.
