Siemens S7-200PLC integrates high-speed counting function - Database & Sql Blog Articles

The Siemens S7-200plc integrates high-speed counting. High-speed counting is a very important function of PLC. In the industrial field, measuring the rotational speed and period is generally a pulsed instrument, such as a rotary encoder. The frequency of such instruments is much greater than the acquisition frequency of the PLC, so the use of high-speed counters is particularly important. The knowledge points of the S7-200 high-speed counting function are mainly divided into several parts: one is the input address, the other is the counting mode, which is classified according to the presence or absence of direction, presence or absence of reset, external reset and soft reset. The third is the corresponding control special function register. To control the mode and preset values ​​of the counter.

High speed counter reset

The reset of the high speed count is very important when using the counter. Since external devices such as encoders and the like generally have accumulated errors, periodic resets are required. In addition, the implementation of some functions of the encoder also requires it to have a reset function.

High-speed counter measuring speed cycle, etc.

Using encoders and high-speed counters, timing interrupts, etc., it is possible to measure data such as the speed period of a rotating body. This function is widely used in motor measurement.