Change PT value in a Timer TON while running "on the fly"

Hello,

Is it possible to change the setpoint value PT in a timer while is running?

for example, if I have 100s and i force the value to 20s, it continues running, showing negative values until it reaches the 100s.

Or maybe I am doing something woring?

Thanks in advance.

See manual  Table 8- 20
Timer
TP
TON
TOF
TONR
Effect of value changes in the PT and IN parameters
Changes in the PT and IN box parameters and the corresponding coil parameters
•
Changing PT has no effect while the timer runs.
•
Changing IN has no effect while the timer runs.
...

You've to restart the timer to re-read the PT (and maybe calc PT from et?)

thanks for the reply.....

Yes indeed, sorry . It's not in the manual (scl, lad is somewhat documented) but in the online help:

PRESET_TIMER(PT := T#25s, := "TON_DB");

 I missed that. Nice. Thx to ... (can't read his name wjile typing)