Create a device to divide the frequency by 4: every four pulses in the input activates one pulse in output A2.1.

The first part of the proposed solutions creates a pulse train, as seen in Example 16, and sends the signal to output A2.0. The second part implements the divider which is no more than a counter that counts back on each pulse of the generator (input ZR controlled by A2.0) and which, when it reaches zero, resets itself to 4 (output Q taken to input S through M0.0).
Every 4 pulses of A2.0 in a single operating cycle resets the count to zero. In this cycle, the output of the counter and the associated merker M0.0 is deactivated. On the other hand, output A2.1 of the PLC is activated because of the negation of the contact with the controlling merker M0.0.

Time diagram of a device to divide a frequency by 4 4

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