In Baidu, I saw a lot of posts discussing "Siemens S7-200 subroutine call timer". Some friends posted that the timer is used in the subroutine. When the main program calls the subroutine multiple times, the logic of the program cannot be executed normally. In fact, in the conditional call subroutine, when the subroutine call is stopped, if the timer has been activated, the step stop calling the subroutine will cause the timer to run out of control. When using a conditional call to a subroutine containing a timer, be sure to pay attention to the resolution and timing logic of the timer to avoid causing the program to run incorrectly. If the subroutine is called multiple times, the program may run out of control. In this case, the timer is generally Only timed when called for the first time. If you write the FC block with STEP7 and call the timer multiple times, there is no problem. Because the S7-200 and S7-300 are different in hardware and software, there is no analogy. When STEP7 defines local variables, the timer can be set as a parameter. In the MICROWIN, there is no timer type in the local variable definition. Fixed numbered timer. The function of the S7-200 is not green enough. The number of timers is limited, but the timing function can be implemented by writing a program. Therefore, there is no problem that the timer is called multiple times. The timer actually reads the CPU internal. The number of crystal oscillators can be programmed with a timer interrupt or SM0.5. The S7-200 is a very versatile product that offers limited functionality directly, but can be continuously thought through, and can be used to gain more space for product use through programming.
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