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PID Blocks

Created by: Asif_73 at: 3/10/2012 1:17 PM (5 Replies)

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3/10/2012 1:17 PM	Rate (0)
Asif_73 Posts: 5 Rating: (0)	Dear Experts, I am undergradute student working on S7-300, I need help regarding my project in which I have to maintain the level on tank having Level Transmitter as in input to PLC and Propotional Valve output for PLC having range (1-10V dc) connected with motor that fills the tank. I have to configure this using PID block will anyone guide me which block i should use and how to fill its parameters.
Asif_73 Posts: 5 Rating: (0)
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3/10/2012 3:44 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Asif_73 Dear Experts, I am undergradute student working on S7-300, I need help regarding my project in which I have to maintain the level on tank having Level Transmitter as in input to PLC and Propotional Valve output for PLC having range (1-10V dc) connected with motor that fills the tank. I have to configure this using PID block will anyone guide me which block i should use and how to fill its parameters. Dear Asif_73, Check the samples for FB41 here (hd_FB41_EX.zip ) : PID Control Package - FB41 Samples Note: Structure decomposition (PD in feedback) is suitable for processes such as level which is integrating in nature.This is not implemented in all control packages but I can mention Modular PID control and standard PID control packages. The following is list of some PID function block and the name of software package: //PID Control FB41(CONT_C) FB42(CONT_S) FB43(PULSEGEN) //PID in CFC300 FB1(CONT_C) FB2(CONT_S) FB3(PULSEGEN) //PID Temperature Control FB58 (TCONT_CP) FB59 (TCONT_S) //Standard PID control FB1 (PID_CP) FB2 (PID_ES) //MODULAR PID control FB19 (PID) Best regards, Hamid Hosseini
	Last edited by: hdhosseini at: 3/10/2012 3:58 PM Demo Channel on Youtube
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3/10/2012 5:41 PM	Rate (0)
Asif_73 Posts: 5 Rating: (0)	Dear Hamid Thank you for your guidence, I will go through this stuff and let you know about my progress and for issue discuss with you...
Asif_73 Posts: 5 Rating: (0)	Last edited by: Asif_73 at: 3/10/2012 5:42 PM
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3/10/2012 5:50 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Asif_73 Dear Hamid Thank you for your guidence, I will go through this stuff and let you know about my progress and for issue discuss with you... Hello again, But for students in university, I suggest working on simplified PID algorithm to be checked instead of using blocks from SIEMENS.You can write your own algorithm using one of the numerical method for solving ordinary differential equations (e.g Rung-Kutta).If you search on web or finding academic textbooks which discussed mathematics of the algorithm ,you can implement it even in LAD . Best regards, Hamid Hosseini
	Demo Channel on Youtube
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3/12/2012 8:58 AM	Rate (0)
Asif_73 Posts: 5 Rating: (0)	Dear Hamid I have worked on Allen Bradly's PLC SLC-500 and made a project that controls a plant having the HMI of that, but i could not implemented PID. I tried the stuff you suggested me but some of the parameters are really out of my understanding. well Dear when I was working with Allen Bradley I had particular programming manuls like for interfacing Thermocouple there was a set of blocks like Double Divide etc for the ladder then i got exect results, in SIEMENS do we have such type of manuls..? or the bloks have already been configured..? And your ideas seems very useful for me but will you please guide me in detail..mean how i can simply implement the formula's for PID ..? If it's possible will you please send the example of ladder having such math's function implemented.. Regards, Asif Hameed
Asif_73 Posts: 5 Rating: (0)
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3/12/2012 9:27 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	Asif_73 Dear Hamid I have worked on Allen Bradly's PLC SLC-500 and made a project that controls a plant having the HMI of that, but i could not implemented PID. I tried the stuff you suggested me but some of the parameters are really out of my understanding. well Dear when I was working with Allen Bradley I had particular programming manuls like for interfacing Thermocouple there was a set of blocks like Double Divide etc for the ladder then i got exect results, in SIEMENS do we have such type of manuls..? or the bloks have already been configured..? And your ideas seems very useful for me but will you please guide me in detail..mean how i can simply implement the formula's for PID ..? If it's possible will you please send the example of ladder having such math's function implemented.. Regards, Asif Hameed Dear Asif_73, about the hardware connection please consult the following manual.It is also good to see how a physical value processed and digitized in different analog modules: SIMATIC S7-300 S7-300 Automation System Module Data About developing the algorithm the following book will be a great help if you can find it in the library of your university. For level control ,hopefully PI controller suffice.P part is the simple multiplication of gain in the error signal.Integration part is the most difficult part.You can use Riemann numerical integration method with high and low limits and a method to avoid saturation (as described in the following book). http://www.amazon.com/gp/product/1556175167/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=1278548962&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=1556179421&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1H53Q10BCNMKWQE4TZHQ Best regards, Hamid Hosseini
	Demo Channel on Youtube
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