Problems with counters in the SIS system
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Recently, when starting a device, the following occurred: the motor started but stopped immediately afterward. It was found in the SOE that the start count value was incorrect after the motor began to operate; subsequently, the motor’s interlock system activated, and it took 20 minutes before the device could be restarted. In the logic diagram, the motor signal enters the counter, and the output signal from that counter goes into the equipment interlock system. Could someone explain how this counter works? What do the various points in the counter represent?
I guess the function of this counter is to increment each time the motor starts; when it reaches 3, it outputs a 0 signal to stop the motor, and after 20 minutes it outputs a 1 signal, after which the counter starts counting from 0 again. In the counter, st stands for the set number of times, timer represents the limit time, ct is the count, td is the timing, in is the input signal, and rts is the output signal. Is that correct?
Double-click to open this block and take a look – that’s how you’ll find out It appears to be a TRICON system.
Take a look at the functions of the ST_COUNTER module in F1