Timer time base

Hello,
the Classicladder documentation says:
"The timer base can be multiples of milliseconds, seconds, or minutes."
This applies to the "old" timer.

Unfortunately, I can only select at least 100ms for both the (old) timer and the IEC timer.
I need to generate a pulse that is 20ms long.

Can anyone support?
Many Thanks

Do you need this 20ms pulse width within Classiclader, or outside in Hal?

If you only need the pulse outside of CL then you could use a Hal component such as the oneshot or edge components to generate your desired pulse width.
linuxcnc.org/docs/stable/html/man/man9/oneshot.9.html
linuxcnc.org/docs/stable/html/man/man9/edge.9.html

If you need a repeating pulse (such as a heart beat) use siggen.
linuxcnc.org/docs/stable/html/man/man9/siggen.9.html