Table 7.1 – Types of counting 43 Name of the mode Input functions Principle of operation Illustration Count-up (inP = 1) Input 1 - count Input 2 - start/stop Input 3 - reset Input 4 - block Counting pulses from zero upwards. When the highest setpoint is reached, the corresponding output is switched and the counter is reset {t1–t2} – blocking signal the counting inputs; t3 – moment of switching of output 2 in case of coincidence of values of the counting register and setpoint 2; {t4–t5} – stop-start signal; t6 – moment of switching of output 1 in case of coincidence of values of the counting register and setpoint 1