PLC, which is better known as the PLC is important in virtually all automated production. Programmable electronic control unit is able to control almost infinite combination of relays, contacts, calendars, and circuits for industrial machines of all types and sizes. It is simply a computer designed for harsh environments. What should replace the complex system of relays, switches and other electromechanical systems. The first PLC was introduced in late 1970 and has continued growing in popularity release.PLC date of manufacture of a few large players such as Siemens, Allen Bradley, Koyo, Fuji, Telemecanique, Mitsubishi grow, etc., like many others. Programming the controller via the manufacturer's software is. Software is not compatible between the PLC and the programming logic, although very similar, there are many subtle differences between different brands. Program in the PLC program is stored, as the scale. Problems of scale can be very involved, and it is another matter. Problems with the hardware, but are very similar and they can be diagnosed easily if you know a little bit "" and the model inputs, especially the lack of results configuration.Hardware of the brain, the main processor, it is rare. It is very easy to visually discover an error in the display on the front of the driver. The suspension may, if the internal pointer PLC or the display of energy technologies available and show the correct voltage of power supply terminals. Some controllers have an internal fuse that can fail. These problems are not as common as no input or output terminal.Inputs and outputs in many configurations and voltages are available. AC and DC are available separately and sometimes in the same department. These outputs can be input / output both analog and digital inputs can be configured with relay or transistor sec. Both the input and output is critical to the configuration API in the first place. If appropriate software is available to guide troubleshooting, is the first recommendation would be to compare the material. Real-time software. Does not appear correct information about the input program, an indicator of the voltage input is open or not. Can production, the terminal does not work properly with the output voltage is twofold, open source has failed, or the wrong voltage to the common terminal of the output. The only way to manage this is to use a multimeter to set the standard. Stress, problem solving, the PLC is not complicated, but you must systematically, whether hardware or software is required to work in harmony for the SPS to carry out its obligations under.