ds of empirical method and sequence control. Sequential control design method is the basic idea of the system ofa working cycle is divided into several connected toa sequence of steps, with ponents (such as memory M) to represent, in any step in the state of each output unchanged. Make the system by the current step into the next step signal is called the transition conditions, it can be an external input signal, such as buttons, such as the limit switch on and off. Can also bea PLC, the signals produced by internal contact signals such as timers and counters. Using sequential control design method, first of all, based on the system of technological process, as shown in the order of the functional diagram, function drawing out the ladder diagram according to order plete the program design.
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