About seimens plc

How to generate a continous pulse in seimens plc model cpu 1510 series

I believe in the hardware configuration for the controller, you can assign the system clock to a memory byte.

This will give you various continuous clock pulses at different frequencies.

I have not done this on a 1500 series, but I have on a 1200 and I assume it would work the same way.

Yes you have the system clock bits in S7-1500.

If the built in HW clock bits don't haev the right frequency, then I'd recommend the Library of General Functions, available from the support site. It has blocks for both a periodic rising edge (impulse) as well as a periodic pulse of variable frequency and pulse width.

https://support.industry.siemens.com/cs/ww/en/view/109479728