Embedded excitation card for wind turbine condition monitoring system DS200FGPAG1A

      The actual physical quantities, in addition to switch values and analog values, also include motion control. The displacement of machine tool components is often represented by numerical quantities. The effective method for motion control is NC, which stands for digital control technology. This is a computer-based control technology born in the 1950s in the United States. It is now very popular and well-established. At present, the CNC rate of metal cutting machine tools in advanced countries has exceeded 40% to 80%, and some are even higher. PLC is also based on computer technology and is becoming increasingly sophisticated. PLC can receive counting pulses with frequencies ranging from several kilohertz to tens of kilohertz. It can receive these pulses in multiple ways and can also receive them in multiple channels. Some PLCs also have pulse output function, and the pulse frequency can reach tens of k. With these two functions, coupled with the data processing and computing capabilities of PLCs, if equipped with corresponding sensors (such as rotary encoders) or pulse servo devices, various controls can be fully realized according to the principle of NC. High and mid-range PLCs are also developed with NC units or motion units, which can achieve point control. The motion unit can also achieve curve interpolation and control curve motion. So, if the PLC is configured with this type of unit, it is entirely possible to use NC to control digital quantities. The newly developed motion unit has even released a programming language for NC technology, providing convenience for better digital control using PLC.