7/20/2012 11:52 AM | |
Posts: 36 Rating: (1) |
Hello All, i made a control PID FB41 in first order. my set point is 1500. why the LMN value is 100 when the SP is exceed 100? (file attached) any suggestion? thanks AttachmentFirza__7.zip (511 Downloads) |
7/20/2012 11:54 AM | |
Posts: 36 Rating: (1) |
i have checked the graphic control using matlab, but why when i compile with plc, the value is different? diagram block is attached |
7/20/2012 12:46 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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Hello , The only thing I can point out would be unstable and oscillatory input in process value may cause the troubles. Transfer function for sensor is somehow rare in modern automation.You have think of notation in control literature which as far as I remember all were analog electronics solutions (Op.Amps,resistors,Capacitors and other circuit element). I suggest that you check samples here: Different ways to call PID controller' FBs (updating)Best regards Hamid Hosseini |
7/20/2012 3:34 PM | |
Posts: 36 Rating: (1) |
Hello,,,hd should I ignore the transfer function as feeback (G=1) because time response is very small? thanks |
7/20/2012 8:08 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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Hello, Check this solution for a 1st order system.Gain of prozess is "1". [code] A M 100.0 JCN n1 = "reg1".COM_RST = "pv".REST L 0 T "reg1".MAN n1: NOP 0 CALL "CONT_C" , "reg1" COM_RST := MAN_ON := PVPER_ON:= P_SEL :=TRUE I_SEL :=TRUE INT_HOLD:= I_ITL_ON:= D_SEL :=FALSE CYCLE :=T#100MS SP_INT := PV_IN :="pv".Y PV_PER := MAN := GAIN :=2.000000e+000 TI :=T#20S TD := TM_LAG := DEADB_W := LMN_HLM := LMN_LLM := PV_FAC := PV_OFF := LMN_FAC := LMN_OFF := I_ITLVAL:= DISV := LMN := LMN_PER := QLMN_HLM:= QLMN_LLM:= LMN_P := LMN_I := LMN_D := PV := ER := CALL FB 1 , "pv" F :="reg1".LMN A :=1.000000e+001 B :=1.000000e+000 INTERVAL:=T#100MS Y := REST := CLR = M 100.0[/code] Best regards, Hamid Hosseini Attachment1st_order.zip (272 Downloads) |
7/21/2012 4:33 AM | |
Posts: 36 Rating: (1) |
how to convert Integral gain Ki to integral time Ti? thanks |
7/21/2012 5:07 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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What is the "Data Type" of parameter "Ki"? |
7/22/2012 11:58 AM | |
Posts: 36 Rating: (1) |
REAL |
11/12/2013 9:22 AM | |
Joined: 4/24/2009 Last visit: 8/20/2024 Posts: 2682 Rating: (135) |
New question splitted to vary the speed of abb drive according to the amperage reading on the starter. Best regards O_Moderator |
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