Control of a stepper motor with a programmable logic controller Siemens SIMATIC S7-1200

V diplomski nalogi je opisan učni model za krmiljenje koračnega motorja s programirljivim logičnim krmilnikom (PLK) Siemens Simatic S7-1200. Opisana sta dva načina krmiljenja koračnih motorjev. Pri prvem načinu je program spisan tako, da s pomočjo časovnikov generiramo pravokotne pulze na izhodih krmilnika. Pri drugem načinu je uporabljen zavihek »Motion Control«, ki so ga v Siemensu razvili prav z namenom krmiljenja koračnih motorjev. Močnostni del za napajanje motorja je izveden z integriranima vezjema L297 in L298N. Ker so na vhodu krmilnika koračnega motorja zahtevani krmilni pulzi na napetostnem nivoju 5 V, digitalni izhodi PLK-ja pa so na 24 V nivoju, je izdelano prilagodilno vezje z optičnimi spojniki. Poleg optičnih spojnikov je na tiskanini še posluževalno polje, na katerem so tri stikala in tri tipke za izbiro režima delovanja motorja.The diploma thesis describes a learning model for controlling stepper motor with the Siemens Simatic S7-1200 programmable logic controller (PLC). It describes two methods of stepper motor control. In the first method, the program is written in a way that we use timers to obtain rectangular pulses at controller outputs. The second method uses the »Motion Control« tab, which was developed by Siemens in order to control stepper motors. Motor control is carried out by L297 stepper motor controller with the corresponding power component L298N. Since the motor controller needs 5V at the input and the voltage of digital outputs is 24 V, adapting circuit with optical couplers was built. In addition to optical couplers, the printed circuit board includes the operating field which has three switches and three buttons for selecting the mode of motor operation