Table 7.1 (continued) 44 Name of the mode Input functions Principle of operation Illustration Count- down (inP = 2) Input 1 - count Input 2 - start/stop Input 3 - reset Input 4 - block Counting pulses from the highest by the module setpoint to zero (decreasing).
When the zero is reached, corresponding output is switched and the setpoint register is written to the count register {t1–t2} – blocking signal on 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 Command count (inP = 3) Input 1 - count Input 2 - direction of count Two inputs are used: counting pulses are applied to the first, the status of the second determines the direction of the count.
If there is a "logical 0" at the second output, the counter increases its value, if there is a "logical 1" it decreases. In this type two setpoints can be set, meanwhile: