AB PIDE issues?

dginbuffalo

Member
Join Date
Dec 2010
Location
Buffalo,NY
Posts
630
Hello. I have some equipment that is using two PIDE function blocks. The parameters are set as:

EnableIn - hardcoded 1
ProgProg mode- hardcoded 1
Prog man - turned on by logic
Prog auto- turned on by logic

When the machine is off, we switch prog man to one and prog auto to zero nd move a manual value in to keep the valve in a ready state. When the machine starts, we switch prog auto to one and prog man to zero. Now the issue- sometims it takes a few minutes when we switch to auto for the PIDE to start modulating. It just sits at its last manual setting and seems to take off when it feels like it. There are two PIDE's tha are doing the same thing. Its almost like they are winding up while sitting in manual. Any ideas what could be causing this?
 
I would create a trend chart that monitors the PIDE Auto and Manual output bits, along with the AutoReq and ManualReq input bits to make sure they are taking effect when you think they are. Also helpful is SP, PV, CV, and CVEU. Depending on what you see, this will lead down different troubleshooting paths, such as timing on scanning the PIDE block relative to setting the bits in logic, PIDE configuration settings such as auto-reset on the inputs, or other logic affecting the output going to the final control element (i.e., the valve).
 

Similar Topics

Greetings ... someone sent me a request for some student handsouts that I developed ... turns out that I had this hosted on my business website...
Replies
0
Views
109
Have a logix controller and I'm using the PIDE block for the autotuner. I've got the hang of doing it for direct control things like pressure...
Replies
21
Views
1,669
Studio 5000 version 34. Have error on PIDE CVFaulted (Status1.2), Control variable (CV) health bad. No more information online or in...
Replies
3
Views
937
Hi everyone, I am trying to add a control loop to my HMI interface however I keep getting the following issue, any idea why this would happen?
Replies
8
Views
1,562
We have a routine that we trigger with a JSR every 10 seconds that has PIDE instructions. This resides in a Periodic task that triggers every...
Replies
6
Views
900
Back
Top Bottom