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P_SEL, I_SEL and D_SEL - FB41

Created by: Eduardo Bannwart at: 11/16/2010 8:12 PM (1 Replies)

11/16/2010 8:12 PM	Rate (0)
Eduardo Bannwart Posts: 14 Rating: (0)	I'm using FB41, but the control presents problems of instability and I suspect this setting below: Entries P_SEL, I_SEL, and D_SEL of the block FB41,are sets to false, true, and false, respectively. This means that the formula for PID, the value of K = 0 (gain), Ti = TI (block FB41) and Td = 0 (derivative time)? What is the formulaof thecalculating this block do? Thanks for the help.
Eduardo Bannwart Posts: 14 Rating: (0)
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11/16/2010 9:53 PM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	hello dear member Check the attachment for some clues.For loop instability you need to select the proper controller (P,PI,PID) for your process.The selection is done by P_SEL,I_SEL and D_SEL. I think you do not need the formulation to tune your loop. I think this link will be useful or check chapter 9 of "Control with SIMATIC" for SIEMENS's customized tables for tuning. regards Attachment pid.zip (276 Downloads)
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