thanks for your feedback. I would suggest to use the SRTF function block with some certain subsystem (e.g. "sybsystem_slow") within your fast task.

Would that solve your issue?

Cheers,
Tomas

Thanks for replying. With the SRTF block in a fast taks, I try to call a slower task on demand (setting EXDIS: True and manual pulse to EXOSH). This generally works, but the timing is not what we want.
The slower task should be executed at the end of a tick of the fast task right away and not wait for the next tick of the slow task. In other works, we want to start the slow task independent of its ticks and toggled by a manual pulse.

I've shared an example project where one can see that the timing is not what we want. In the project open the TRND bock and run MP. We want the time of the top of the rising edge to match the time in the display; neglecting computation time to calculate the time.

I hope my intention is clear.
Regards
Carvin

test_on_demand_running_ca.zip

Thank you for your question. It is possible to set the start of task execution as soon as the previous task ends. More details in TASK documentation: https://www.rexygen.com/doc/ENGLISH/MANUALS/BRef/TASK.html#x26-250002

Information between tasks should be always sent via Inports and Outports if possible (SETPx function blocks can introduce undesired inverse of priorities when sending data between tasks).

Second part - "on demand" execution:
Thanks for sharing your solution! It is also possible to use SRTF function block (Set run-time flags):
Doc: https://www.rexygen.com/doc/ENGLISH/MANUALS/BRef/SRTF.html#x21-200002

If you need any assistance just let me know.

Cheers,
Tomas

.test_on_demand_running.zip