Explain the operation of the basic flip/flop circuit using the accompanying figure.
What will be an ideal response?
The basic flip/flop circuit is shown in Rung 2 of Figure 22–2.
It gets the name flip/flop because any time the input memory address labeled “Flip/Flop Trigger” is true or ON and the PLC processor scans the rung, the output, the light to be controlled in this case, will change state or alternate, hence the name flip/flop. In Rung 1 of Figure 22–2 the real-world push button is used to turn on the “Flip/Flop Trigger” output that is used to change the state of the flip/flop circuit. The “ONS” instruction in Rung 1 is a One-Shot instruction used to keep the “Flip/Flop Trigger” output ON for only one scan, which is required for proper operation of the flip/flop circuit.
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