Eclipse Community Forums: 4DIAC - Framework for Distributed Industrial Automation and Control

Home » Eclipse Projects » 4DIAC - Framework for Distributed Industrial Automation and Control » Calculate Time difference in 4diac

Calculate Time difference in 4diac [message #1815642]

Mon, 07 October 2019 13:18

Eclipse User

Excuse me...
I want to calculate the time difference like in the picture.

Ta = the time when the message was sent
Tb = the time when the message was received
T = Ta-Tb.

I think this can be done by recording the CNF event as the sending time and the REQ event as the receiving time. Is this measurement possible in forte 10? If so, how to do that?

Thank you very much

Attachment: IMG_20191008_000843.jpg
(Size: 1.95MB, Downloaded 129 times)

[Updated on: Mon, 07 October 2019 13:22] by Moderator

Re: Calculate Time difference in 4diac [message #1815645 is a reply to message #1815642]

Mon, 07 October 2019 14:58

Eclipse User

If I understand you correctly then yes this can be done easily. With the new 1.11.0 release, which we just uploaded a few minutes ago [1] we introduced the method NOW_MONOTONIC and NOW which gives you timestamps which you can diff using the IEC 61131-3 functions. This you can use in a basic FB. E.g., the alg before CNF logs the send time and the alg triggered by REQ logs the receive time.

[1] https://www.eclipse.org/4diac/en_news.php#en_news_20191007

Re: Calculate Time difference in 4diac [message #1815646 is a reply to message #1815645]

Mon, 07 October 2019 15:10

Eclipse User

Thank you very much for the answer...

Then, when should I use NOW_MONOTONIC and when should I use NOW?

Re: Calculate Time difference in 4diac [message #1815648 is a reply to message #1815646]

Mon, 07 October 2019 15:57

Eclipse User

NOW is to give you the current time. This may be affect to step changes (e.g., adjusting winter/summer time).

NOW_MONOTONIC gives you a clear monotonic time. In your case I don't think it will make much difference but I think NOW_MONOTONIC may be simpler to use.

Re: Calculate Time difference in 4diac [message #1817998 is a reply to message #1815648]

Wed, 04 December 2019 00:48

Eclipse User

Thank you for the answer

Previous Topic:	winsock2.h error when build FORTE
Next Topic:	Install mqtt paho in windows

Goto Forum:

-=] Back to Top [=-

Current Time: Sat Jul 26 02:50:41 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter