Single Loop Controller with Off/Force/PID control
Single Loop Controller with Off/Force/PID control
(OP)
I am in need of a panel-mount single loop controller (SLC) that can have its "mode" set by 2 digital inputs (DI1 & DI2).
For example...
When DI1 AND DI2 are true, then output = FORCE to ##ma.
When DI1 true AND DI2 false, then output = PID control.
When DI1 AND DI2 are false, then output = OFF (or <4ma).
I have been told that I can only do one DI, therefore OFF would have to power down the SLC. OR I could remotely change the setpoints , but it would still be in PID control.
I would prefer a controller less than ~$500, therefore no mini-PLC's.
For example...
When DI1 AND DI2 are true, then output = FORCE to ##ma.
When DI1 true AND DI2 false, then output = PID control.
When DI1 AND DI2 are false, then output = OFF (or <4ma).
I have been told that I can only do one DI, therefore OFF would have to power down the SLC. OR I could remotely change the setpoints , but it would still be in PID control.
I would prefer a controller less than ~$500, therefore no mini-PLC's.





RE: Single Loop Controller with Off/Force/PID control
We have a few Yokogawa YS170 controllers that may meet your requirements. Contact your Yokogowa salesperson for details. I could email some PFD documents but my connection from this platform is dialup speed. Downloads are available on the web. Try http://kb.us.yokogawa.com/modules.php?name=Downloads&d_...
John
RE: Single Loop Controller with Off/Force/PID control
RE: Single Loop Controller with Off/Force/PID control
I think the EC321 model controller (which I used several years ago) can do the trick - and I am sure, FUJI will have other eligible single loop controllers too.
RE: Single Loop Controller with Off/Force/PID control
Have a look: http://www.eurotherm.co.uk/process/T630.htm
RE: Single Loop Controller with Off/Force/PID control
Best Regards
Paulo Afonso
Integration expert
EINAUS Eng, Lda
Portugal