S7-200 CPU, counter to be accrued from the input port or the number of pulses sent by internal components. It has additional counters, counter and increase/decrease the counter 3 types. Due to the counter frequency scan cycle limitations, when you need to use high frequency to high frequency signal count counter (HSC).
Counter has the following two kinds of address form.
Current value of addressing: a 16-bit signed integer, stored cumulative number of pulses.
Counter address: based on the current value and preset values of the result set or reset. As with the timer, two addressing modes use the same format, the C+ counter number. For example: C0