SCM and Plc are essentially the sam

SCM and Plc are essentially the same, their development is based on micro processing technology and the PLC is actually a product based on SCM and SCM is actually an integrated circuit, the volume is relatively small, the cost is low, cheap and convenient, but the main one - Control board made by the single-chip microcomputer is influenced by the layout of the software, the ambient temperature, the process of manufacturing the board, etc., and its stability and anti-interference are relatively weak.Comparison of the two main controls, both have advantages and disadvantages, depending on the design activity of the subject, vehicle inversion alarms for a small volume, it is easy to transport and install, the spaceship does not occupy the apparentFeatures of a large volume without PLC meet the design requirements, so this design uses the MIKROcontroller AT89C51 as the main control.