Jump to content

Repeating timers with comparators


Recommended Posts

Hello, 

I need to make a program in Visilogic that based on repeating 15 minute timer.  when the 15 minutes is completed the ph. value will be read and if its above 10.5ph it will decrease a valve turn by 1%. If its between 10.5-8.5 it does nothing. If its below 8.5ph it will increase the valve turn by 1%. After this the timer restarts. 

I am having a lot of trouble with the timer and I thought of using greater thans, within range and less thans. but I don't think this is the best way. 

 

Any help is greatly appreciated

 

Link to comment
Share on other sites

  • MVP 2023

You do not post any info about your setup.

Please try to use something like this ladder. Please note - Visilogic operate with integer value. And if you read PH 10.5 - you must convert it to 105 integer (or use float numbers in ladder and float compare function for correct operation).

15_min_timer.thumb.jpg.50043f3ab342160f17ca7ea2d4140e77.jpg

  • Thanks 1
Link to comment
Share on other sites

  • MVP 2023
On 7/8/2022 at 9:59 AM, Abby said:

I am having a lot of trouble with the timer

Self-resetting timer, as in kratmel's rung #1, is a very useful tool.

And kratmel smartly recognizes that the direct contact of TD 1 is the same as a positive transition contact in this case, thus you don't need to waste the limited number of positive transition contacts available.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...