electrical-engineering-portal.com http://electrical-engineering-portal.com/basic-steps-in-plc- programming? utm_source=Technical+Articles&utm_campaign=70472bd917- RSS_EMAIL_CAMPAIGN&utm_medium=email Basic Steps I n PL C Programm ing (pho to by ProWest Engineering) Ba sic Steps I n PLC Programming The firststep in developing a control program is the definition of the control task. The control task specifies what needs to be done and i s defined by tho se who are involved in the opera t ion of t he machine or
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To program the PLC, the devices must be programmed in the same logic sequence as they are inthe hardwired circuit (see Figure 3). Therefore, the stop push button will be programmed as an
examine-ON instruction (a normally open PLC contact ) in series with t he start push button, which is
also programmed as an examine-ON instruction.
This circuit will drive output 030, which cont rols the starter.