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Initialize PID(190)

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#1 aVi

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Posted 05 December 2010 - 10:28 AM

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)?

#2 Sleepy Wombat

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Posted 10 December 2010 - 03:00 AM

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.

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#3 ParaffinPower

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Posted 13 December 2010 - 02:11 PM

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?

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Edited by ParaffinPower, 13 December 2010 - 02:17 PM.



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