Jump to content

Some Issues with Auto-tune.

Recommended Posts


V700 with V200-18-E3XB

I  am having some issue while trying to auto tune with PID SERVER. I let the autotune run with 2 cycles. by the time it complete i get a "run time error 6 overflow" error and PID server crashes. From what i understand it is a overflow error but I'm not sure how to fixt is within visilogic. Any advice appreciated. 


I am using a T/C to take temp of water then a PWM output to a solid state relay which would heats up water.


Attached is the project that is giving me the error

version 4.vlp

Link to comment
Share on other sites

It seem like the auto tune never completes when just running from the HMI.  The process value will over shoot then drop underneath the set point multiple time (I have to atuotune set to complete after one cycle.) with out the autotune complete bit going high.

I was basing most of the ladder logic off this webinar



Link to comment
Share on other sites

1. Delete MI 8 power-up value -Sample Time.

It will be calculated by Autotune.

2. Water temperature range is 0 to 100.

It is recommended to set:

- MI 9 =0 (0.0)

- MI 10 = 1100 (110.0)

3. MI 0 show temperature in 0.1 C/F.

4. Change User Set point MI 47 format to 4.1


Entering 55.1 from display will be represented as 551 in MI.

4. Use MI 47 instead of MI 3.

5. Sample MI 0 in 4.1 format.

6. Delete nets 2 and 3.

Test it.



  • Like 1
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.

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...