even simplier solution in LAD

Input          Txx                Txx
----||----------|\|---------------(SD)
                                        S5t#10s

SD = on-delay timer coil

result - examine Txx timer, for example

    Txx
----||----

this will give one shot pulses every 10s provided input is ON

when input goes off timer stops

first pulse is always 10s after input changes from 0 to 1