PLC control process instances - — Timer counter

In this case no practical significance, but very beneficial to analysis program execution. System input only by one button, no output, refer to figure 5 - 2, only X0. Analysis diagram 5 - 5, ( 一) 、( b) 、( c) Three cases, observe the current value of the counter, analyze the process of program execution. M8011 in the program as a special auxiliary relay, as long as the PLC controller is in running state, will keep making 10 ms pulse signal, 5 ms tong, 5 ms) 。 Program, X0 T0 1 s timing closure after 1 s, T0 conduction. C0 to counter, under the premise of not closed in closing X0, T0, record M8011 pulse number. In theory, the T0 conduction, stop counting C0 counter, counter current value should be 100 ( 1 s / 10 ms = 100 pulse) 。 Three sections in the program, just change the position before and after the execution, but the results are different. Combined with the corresponding sequence diagram to analyze its reasons.
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