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PID set speed temperature

Created by: SAR-CNT at: 9/8/2019 12:20 PM (10 Replies)

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9/8/2019 12:20 PM	Rate (0)
SAR-CNT Silver Member Joined: 1/23/2013 Last visit: 8/10/2022 Posts: 226 Rating: (5)	Hi Interested in the possibility of implementing PID S7-1200 1215: "PID set speed temperature" 1. temperature set speed 2. temperature cooling rate 3. set point speed (cooling) temperature C/min 4. The initial temperature setting with which the temperature is set (cooled)

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9/9/2019 6:55 AM	Rate (0)
CaOd Platinum Expert Joined: 5/6/2010 Last visit: 9/12/2025 Posts: 2031 Rating: (284)	Hello SAR_CNT, if you use the PID_Temp then can you do the follow 1. temperature set speed You must calculate your setpoint of the PID then it works, the PID have not this function 2. temoerature cooling rate The same answer like 1. 3. Setpoint speed K/min You can change your setpoint with the function LGF_Ramp (LGF - Library of general functions) 4. the initial temperature set for cooling Change your setpoint This functions can you also solve with the LGF_LimRateOfChange... You can find this function at the LGF chapter 3.8 technology operations regards CaOd

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9/9/2019 11:50 AM	Rate (0)
SAR-CNT Silver Member Joined: 1/23/2013 Last visit: 8/10/2022 Posts: 226 Rating: (5)	Hi How to implement feedback PID set temperature over time? LGF -> 15C / min=0.25C/s -> set_PID -> temperature feedback-->OK-->+0.25C/s-->set_PID temperature feedback?

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9/9/2019 1:11 PM	Rate (0)
CaOd Platinum Expert Joined: 5/6/2010 Last visit: 9/12/2025 Posts: 2031 Rating: (284)	Hello, you can't set a speed for a temperature at the PID-Control. Why do you need a feedback fore your temperature speed? Connect the setpoint over the function LGF_Ramp to the setpoint of the PID-controller. The actual value is the "feedback" for your PID. LGF Ramp has no feedback. Setpoint -> LGF-Ramp -> Setpoint PID-Controller Actual value -> Input PID-Controller You can calculate the speed between 2 points e.g. use a cyclic interrupt with 60 s and save your actual temperature at a DB. At the OB can you calculate the speed of your temperature like actual temperature - old temperature Then you have as result a value in K/min If you do this calculation every second, xyou have the value in K/s. regards CaOd

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9/9/2019 1:28 PM	Rate (0)
SAR-CNT Silver Member Joined: 1/23/2013 Last visit: 8/10/2022 Posts: 226 Rating: (5)	Hello, Caod Temperature Feedback: - to increase the accuracy and smoothness, set the temperature if at a given setpoint we did not receive a given setpoint by feedback, then we wait for the setpoint and the setpoint to be equal, then increase the setpoint but adjusted for the time that has passed. Any other thoughts?

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This contribution was helpful to 1 thankful Users kulmx

9/9/2019 9:17 PM	Rate (0)
CaOd Platinum Expert Joined: 5/6/2010 Last visit: 9/12/2025 Posts: 2031 Rating: (284)	Hello, please have a look at the function LGF_LimRateOfChange.. With this function you can solve your challenge. Otherwise can you use the function IN_Range to check that you actual measured temperature is nearly the setpoint. Then can you start or stop your ramp In my opinion need you a controller for a process ramp. The LGF_LimRate... have this function. regards CaOd

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9/11/2019 6:02 PM	Rate (0)
SAR-CNT Silver Member Joined: 1/23/2013 Last visit: 8/10/2022 Posts: 226 Rating: (5)	Hello, CaOd There are problems in the PID auto settings: I and D when temperature is set ... We have an accurate furnace, and depending on the amount of glass loaded, I make inaccuracies in the temperature set. S7-1200 can I do PID auto-tuning for accurate temperature set?

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9/12/2019 6:48 AM	Rate (0)
CaOd Platinum Expert Joined: 5/6/2010 Last visit: 9/12/2025 Posts: 2031 Rating: (284)	Hello, you can do the "Auot-tuning" with this PID. In my opinion is the challenge that you yhould tune your system when is loaded. If you do this with a empty system then you have not the accuracy parameters. Ask your productionif you can optimize your system with a "damaged" out of quality product. If this not possible then is my suggestion to tune your PID aith a empty system and check it during "real" process and tune it by manual. If you change your PLC from a 1200 to a e.g. ET200SP-CPU (1500) the you can also use the PID-function TCONT_CP. This function can you use without a auto-tuning. regards CaOd

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9/13/2019 9:43 AM	Rate (0)
kulmx Experienced Member Joined: 1/15/2007 Last visit: 9/10/2025 Posts: 53 Rating: (0)	Hi, Ramp SOAK FUNCTION_BLOCK FB121 TITLE =" ramp soak" AUTHOR : AUT_1 FAMILY : MODCONT NAME : RMP_SOAK VERSION : " 1.1" // reverse by komatic (* The RMP_SOAK block is used mainly as a generator (shaper) of the setpoint signal in the regulators working with a set of settings, each of which is selected at a given time. Function RMP_SOAK allows you to create a timeline signal changes, the individual coordinates of which should stored in a common data block. Signal values in segments time between coordinates are interpolated. Using the control parameters can be selected following modes: • Activation of the function RMP_SOAK; • Issuing an output signal with a predetermined value; • Delay "freeze" work; • Setting the coordinate number and time to continue work; • Restart function; • Change in total operating time and total remaining time. ) VAR_INPUT DF_OUTV : REAL ; // DB_NBR : BLOCK_DB ; // TM_SNBR : INT ; // TM_CONT : TIME ; // DFOUT_ON : BOOL ; // RMPSK_ON : BOOL ; // HOLD : BOOL ; // CONT_ON : BOOL ; // CYC_ON : BOOL ; // TUPDT_ON : BOOL ; // COM_RST : BOOL ; // CYCLE : TIME := T#1S; // END_VAR VAR_OUTPUT OUTV : REAL ; // QR_S_ACT : BOOL ; // NBR_ATMS : INT ; // RS_TM : TIME ; // T_TM : TIME ; // RT_TM : TIME ; // END_VAR VAR sOutEnd : REAL ; sOutOld : REAL ; siNbratms : INT ; stRstm : TIME ; stTtm : TIME ; stRttm : TIME ; sbStart : BOOL ; // sbQrsact : BOOL ; // END_VAR VAR_TEMP Sollwert : REAL ; dOutNeu : REAL ; // dJ : INT ; // END_VAR BEGIN Sollwert:=DF_OUTV; IF COM_RST THEN stTtm:=T#0MS; FOR dJ:=0 TO WORD_TO_INT(DB_NBR.DW0) - 1 BY 1 DO stTtm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD[dJ8+6]))+stTtm; // out time END_FOR; dOutNeu:=0.0; // out stRttm:=stTtm; sOutEnd:=0.0; siNbratms:=0; stRstm:=T#0MS; sbStart:=1; sbQrsact:=0; ELSE IF RMPSK_ON THEN IF sbStart THEN dOutNeu:=DWORD_TO_REAL(DB_NBR.DD2); // current output variable sOutEnd:=DWORD_TO_REAL(DB_NBR.DD10); // next output variable stRstm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD6)); // holding time of the current output variable stRttm:=stTtm; siNbratms:=1; sbStart:=0; sbQrsact:=1; ELSE IF HOLD THEN sbQrsact:=0; dOutNeu:=sOutOld; IF CONT_ON THEN sOutEnd:=DWORD_TO_REAL(DB_NBR.DD[TM_SNBR8+2]); stRttm:=TM_CONT; stRstm:=TM_CONT; siNbratms:=TM_SNBR; FOR dJ:=siNbratms TO WORD_TO_INT(DB_NBR.DW0) - 1 BY 1 DO stRttm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD[dJ8+6]))+stRttm; END_FOR; END_IF; ELSE IF stRstm > CYCLE THEN dOutNeu:=(sOutEnd-sOutOld) / DINT_TO_REAL(TIME_TO_DINT(stRstm)) * DINT_TO_REAL(TIME_TO_DINT(CYCLE)) + sOutOld; stRstm:=stRstm-CYCLE; stRttm:=stRttm-CYCLE; ELSE IF siNbratms < WORD_TO_INT(DB_NBR.DW0) THEN sOutEnd:=DWORD_TO_REAL(DB_NBR.DD[(siNbratms+1)8+2]); dOutNeu:=DWORD_TO_REAL(DB_NBR.DD[siNbratms8+2]); stRstm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD[siNbratms8+6])); siNbratms:=siNbratms+1; sbQrsact:=1; stRttm:=stRttm-CYCLE; ELSE IF CYC_ON THEN sbStart:=1; ELSE sbQrsact:=0; END_IF; dOutNeu:=DWORD_TO_REAL(DB_NBR.DD[siNbratms8+2]); END_IF; END_IF; END_IF; END_IF; ELSE sbStart:=1; dOutNeu:=0.0; QR_S_ACT:=0; END_IF; IF TUPDT_ON // update time calculation THEN stTtm:=T#0MS; stRttm:=stRstm; FOR dJ:=0 TO WORD_TO_INT(DB_NBR.DW0)-1 BY 1 DO stTtm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD[dJ8+6]))+stTtm; END_FOR; FOR dJ:=siNbratms TO WORD_TO_INT(DB_NBR.DW0)-1 BY 1 DO stRttm:=DINT_TO_TIME(DWORD_TO_DINT(DB_NBR.DD[dJ8+6]))+stRttm; END_FOR; END_IF; END_IF; IF DFOUT_ON THEN dOutNeu:=Sollwert; sbQrsact:=0; END_IF; OUTV:=dOutNeu; sOutOld:=dOutNeu; QR_S_ACT:=sbQrsact; NBR_ATMS:=siNbratms; RS_TM:=stRstm; T_TM:=stTtm; RT_TM:=stRttm; END_FUNCTION_BLOCK
	Last edited by: kulmx at: 09/13/2019 12:57:54
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9/14/2019 9:09 PM	Rate (0)
kulmx Experienced Member Joined: 1/15/2007 Last visit: 9/10/2025 Posts: 53 Rating: (0)	Hello TIA SCL Attachment ramp soak.zip (501 Downloads)

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9/14/2019 9:12 PM	Rate (0)
kulmx Experienced Member Joined: 1/15/2007 Last visit: 9/10/2025 Posts: 53 Rating: (0)	Ramp Attachment ramp_soak_03.png (289 Downloads)

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