[foxboro] Windup in cascade configuration

Hi folks,
 

I have some questions about the cascade configuration of two PID blocks. In 
case of clamping in the secondary block, what happens with the output of the 
primary block?

For example, if the secondary block clamps at 50% output, I think that the 
primary block should not keep integrating because in this a windup can occur at 
its output.

If I am right, the anti-windup works when the BCALCO of the secondary block 
goes to the FBK and BCALCI of the primary block. Do I need anything else to 
prevent windup?

 

Thanks in advance,

 

Ignacio Queirolo Olivera

Control Avanzado

Complejo Industrial Ensenada

Repsol YPF - Química

Tel.: 54 221 429-8400 ext. 26481

Fax: 54 221 429-8400 ext. 26209

iqueiroloo@xxxxxxxxxxxxx <mailto:iqueiroloo@xxxxxxxxxxxxx> 

 



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