The commonly used method of PLC ladder diagram programming - — Conversion method & have spent Conversion method introduction

Conversion method: is the relay circuit diagram is converted into the same as the original function of PLC ladder diagram. The equivalent conversion is a convenient method of programming, first, the original relay control system after long-term use and test, have been shown to complete system requirements of control functions; Second, the relay circuit diagram and PLC ladder diagram on the representation and analysis method have many similarities, so according to the relay circuit diagram to design the ladder diagram is easy; Third, this kind of design method generally do not need to change the control panel, keep the external characteristic of the original system, operators need not change in the form of long-term operation habit. ( 1) The basic method. According to the relay circuit diagram to design the PLC controller ladder diagram, the key is to catch them one-to-one correspondence relationship, namely the control function of corresponding, corresponding logic function, and the corresponding relay PLC hardware components and software components. ( 2) Convert design steps. 1) Understand and familiar with charged equipment process and mechanical action, according to the relay circuit diagram analysis and master the working principle of control system. 2) Determine the input signal and output signal of PLC controller, draw the PLC external wiring diagram. 3) Determination of auxiliary relay (PLC ladder diagram is M） And a timer ( T） Number of components. 4) According to the corresponding relationship between draw the PLC ladder diagram and further optimized the ladder diagram is conform to the requirements of the control and reasonable, organized, and reliability.
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