Counting is the simplest mathematical operation, and the electronic counter realizes this operation through the circuit. In the digital system of counter, the functions of measurement, counting and control are mainly realized by counting the number of pulses.

2. The electronic counter has frequency division function at the same time. The counter consists of some basic counting units and structural control gates. The counting unit consists of a series of flip-flops with the function of storing information, such as RS flip-flop, T flip-flop, D flip-flop and JK flip-flop.

3. The wiring method is to determine the position of the power terminal first. If a proximity switch or photoelectric switch is connected, the brown line (partially red) of the switch is connected to the meter 12V (partially marked as VCC or U0).

4. The blue wire is connected to the GND terminal of the instrument (the part is marked as COM), and the black wire is connected to the IN terminal (the part is marked as CNT). If a two-wire mechanical contact switch is required, the two wires should be connected to the IN terminal and GND terminal mentioned above.

Counting is the simplest and most basic operation, and the counter is the logic circuit to realize this operation. In the digital system, the counter mainly counts the number of pulses, realizes the functions of measurement, counting and control, and also has the function of frequency division. The counter consists of a basic counting unit and some control gates.

The counting unit consists of a series of flip-flops with the function of storing information, such as RS flip-flop, T flip-flop, D flip-flop and JK flip-flop. Counter is widely used in digital system, such as counting instruction addresses in the controller of electronic computer, so as to take out the next instruction in order.

Write down the addition and subtraction times in multiplication and division in the arithmetic unit, and count the pulses in the digital instrument. Counter can be used to display the working status of products. Generally speaking, it is mainly used to indicate how many copies of folding and matching work have been completed.

Its main index lies in the number of digits of the counter, generally 3 digits and 4 digits. Obviously, the 3-bit counter can display 999 at most, and the 4-bit counter can display 9999 at most.

Reference source: Counter _ Baidu Encyclopedia