In addition, it is best to add a small capacitor filter to the voltage divider, and then connect it to the single chip microcomputer (such as 74 14) after being shaped by Schmidt trigger, so as to reduce external interference and make the counting more reliable, and secondly, to protect the single chip microcomputer (74 14 at most).
Generally, the rotary encoder outputs three signals ABZ, and the phase difference of AB is 90, connecting A to the interrupt. When A falls, B is high, indicating a step forward, and B is low, indicating a step backward.
System functions:
PLC programming is widely used, powerful and easy to use, and has become one of the main equipment of contemporary industrial automation. It has been widely used in various fields of industrial production, and its application in other fields (such as civil and home automation) has also developed rapidly.
In the third draft of PLC standard of 1985, the definition of PLC by IEC is: "It is an electronic system with digital operation, specially designed for application in industrial environment. It uses programmable memory to store instructions for performing logical operations, sequence control, timing, counting and arithmetic operations.
And through digital and analog input and output, control various types of machinery or production processes. Programmable controller and its related equipment should be designed according to the principle that it is easy to make the industrial control system form a whole and expand its functions. "As can be seen from the above definition.