Forums.MrPLC.com: Initialize PID(190) - Forums.MrPLC.com

Jump to content

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

Initialize PID(190) Rate Topic: -----

#1
User is offline   aVi 

  • Hi, I am New!
  • Pip
  • Group: MrPLC Member
  • Posts: 1
  • Joined: 03-December 10
  • Country:United States
    United States
I'm working on integrating a PID for tension control into a CS1G-H processor. I have already been able to successfully implement this PID in a similar application with a Siemens 313C PLC using their integrated PID. So far I am optimistic but, Siemens has an Initialize integral action bit which presets the integral component of the PID when set. I have been unable to recreate this function in Omron's PID. Is such a function possible with PID(190)?
0

#2
User is offline   Sleepy Wombat 

  • Controls Engineer
  • Group: MrPLC Admin
  • Posts: 1,957
  • Joined: 09-October 03
  • Gender:Male
  • Location:Sydney, NSW
  • Country:Australia
    Australia
You are using the H series - i thought that the PID instruction in this series plc had an auto tune function.
Anyways, I am a bit unclear as to what you mean by pre set the integral.
You can set the P I and D via the corresponding memory areas determined by your control word.
There is a setup bit that alows dynamic chaning of the P I and D values while the PID is executing, if you do not set this bit then the P I and D settings will only be initalised on the up of the enable signal line for the PID.
Remember to set a value for the T constant also.
www.dexa.com.au - Design Engineering Xtreme Automation - DEXA Pty Ltd ** Automating the World Around You **
www.wi-count.com.au - WI-COUNT Wireless Counting Technologies ** Wireless People Counting **




0

#3
User is offline   ParaffinPower 

  • Sparky
  • PipPipPip
  • Group: MrPLC Member
  • Posts: 393
  • Joined: 01-February 06
  • Location:Manchester
  • Country:United Kingdom
    United Kingdom
Hi SW
I think the OP meant Reset, not Preset the integral. I've had a look, and can't find anything, I'm afraid. I guess one of the 30 or so Words the PID intruction uses is the integral portion of the output. I'll try to decode it next time I'm using it...

Edit:
Not sure here, but can you change the integral gain to 9999 (disabled); I don't know if the integral action will return to what it was or start at zero again when you re-instate the 'correct' I gain?

Pp

This post has been edited by ParaffinPower: 13 December 2010 - 02:17 PM

0

Share this topic:


Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

1 User(s) are reading this topic
0 members, 1 guests, 0 anonymous users