The main job of the output module plc

SCM can be used to direct the development of control systems, but very demanding for the developer (not the general level capable of ) , long development cycles, high costs ( for some large decency you need to Nanda plc power supply module  do a little experiment , a printed circuit board requires a considerable the cost , you can say you use the emulator to develop experimental board , but I have to tell you , do you just verify the feasibility of hardware and software , does not mean that can be used in industrial control systems, industrial control systems because Immunity requirements for very high stability first , rather than the performance of the first , so you must constantly  Nanda plc input output modules test the circuit board design , improvement ) when you solve these problems, you will find that you have done a PLC , of course, If you need to use someone else can easily use the software you'll need a set , so you may not need to tell others about your circuit ( you can not tell anyone ) .
       Many people feel very mysterious PLC , PLC is actually very simple , in addition to its internal CPU speed , the Nanda Programmable Output Module  other functions not as common microcontroller . PLC usually uses 16 or 32-bit CPU, serial communication with the outside world with a channel or two , and has an internal timer can , to improve the reliability plus a watchdog timer is enough .