How do I specify if the PID object is direct or reverse acting?

I have a process that requires a reverse acting controller - eg if the PV is above the setpoint, I need to increase the controller output to lower the PV. Where in the PID object configuration do I specify this?

Pat,
I think - you can achieve a "reverse acting" PID controller by setting the Gain value negative. However, if you manipulate the PID parameters you should know what effect it will have on your system. If you want to be sure you should simulate the parameter before you apply them to the "real" world. In addition you could verify the -Gain setting with the formula (position/velocity control equations) given in the Lookout online help of the PID control object.
Hope this helps
Roland
PS: I always keep in mind what my control profssor told us once - "just a minus sign (sign change) in contol theory could mean a lot"

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------------------ Code Line ------------------------------------
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Thanks
Just what I needed, except I needed to caste response.
Michael C
"Daniel Selman" <[email protected]> wrote:
Michael,
// get the HttpServletResponse from the HttpServletRequest
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equest.getAttribute( WebflowConstants.HTTP_SERVLET_RESPONSE );
Cookie cPassword = new Cookie("YYY","ZZZ");
cCustSeqNumber.setPath("/");
cPassword.setPath("/");
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response.addCookie(cPassword);
You HAVE the HttpServletRequest...
public Object process(HttpServletRequest req, ObjectrequestContext)
throws ProcessingExceptionMake sense?
Dan
"michael C Ford" <[email protected]> wrote in message
news:[email protected]...
How can I get to the response this way ?
this just stored the response as an attribute did it now ?
If I don't have it, how can I use it in a setAttribute ?
Sorry just a little slow
I can't do this can I ?
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response.addCookie(cPassword);
"Daniel Selman" <[email protected]> wrote:
Michael,
I found this handy snippet in our code:
// Put the httpServletResponse into the request, this is done
in
case IPs want to
// use the response to deposit cookies. The IPs maynot howeverwrite
// anything to the response as this will cause an
IllegalStateException
request.setAttribute(WebflowConstants.HTTP_SERVLET_RESPONSE,
response);
So, the HttpServletResponse is bound into the HttpServletRequest usingthe
key, WebflowConstants.HTTP_SERVLET_RESPONSE.
Magic!
Sincerely,
Daniel Selman
"michael C Ford" <[email protected]> wrote in message
news:[email protected]...
How do I get to the request object in a webflow.
I created a input process and one function it needs to do is create
a
cookie.
Problem is I don't have a response object.
How do I create/get the response object so I can create a cookie.
Thanks
Michael C Ford
------------------ Code Line ------------------------------------
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requestContext)
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Attachments:
Untitled.png ‏39 KB

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