PID Temperature Control

yakuzaturk · Jul 14, 2013

Dear friends

I'm working on a project to control the furnace temperature.

As you see in the attached image,The operator enters the parameters(t1,t2,t3,t4,t5,t6,t7,T1,T2,T3) with a siemens hmi.

I want to use the PID temperature controller block of SIEMENS S7 PLC for my temperature controls.

PLC with thermocouple feedback must command to three SSR for switching the heaters.

Can anyone help me?

danw · Jul 14, 2013

Honeywell's PAC has a setpoint programmer function block that feeds a setpoing into a PID block, as shown below. Does the Siemens have anything like that?

yakuzaturk · Jul 14, 2013

danw said:
Honeywell's PAC has a setpoint programmer function block that feeds a setpoing into a PID block, as shown below. Does the Siemens have anything like that?

Dear danw

I can not see the image you post.
Please send it again.

keithkyll · Jul 15, 2013

The term is called "Ramp and Soak". See the link in this link.

yakuzaturk · Jul 15, 2013

keithkyll said:
The term is called "Ramp and Soak". See the link in this link.

Dear keithkyll

Thanks for your answer but I need a close loop system.
System temperature is measured and feedback by thermocouples.

Ken Roach · Jul 15, 2013

Just reminding y'all it's a total embargo. Hardware, software, money, advice: everything. It's Federal, and it's inflexible.

yakuzaturk · Jul 15, 2013

Ken Roach said:
Just reminding y'all it's a total embargo. Hardware, software, money, advice: everything. It's Federal, and it's inflexible.

Thank you for the reminder but this project is not associated with the activities of nuclear energy.

yakuzaturk · Jul 15, 2013

I need your help.
My time is rapidly passing.

KalleOlsen · Jul 15, 2013

Your question is very open.

What kind of S7 plc is it? 200? / 3-400? /1200? /1500?

Don't you find a suited standard PID-control FB?

Are your 3 SSRs controlling 3 equal elements?

Or is it problem with the setpoint scheduler?

Kalle

yakuzaturk · Jul 15, 2013

KalleOlsen said:
Your question is very open.

What kind of S7 plc is it? 200? / 3-400? /1200? /1500?

Don't you find a suited standard PID-control FB?

Are your 3 SSRs controlling 3 equal elements?

Or is it problem with the setpoint scheduler?

Kalle

I use plc s7-300 for this project but it's possible for me to change with another one.

I need one PWM pulse for turn on and off 3 SSR (actually one command for all).
3 elements connected to 380 volt with SSR in star connection.

The operators must enter times and temperatures and then start the process.
I don't have problem with HMI software. My main problem is : I'm amateur with using PID controller.
Which FB solves my problem? How I use this FB.

KalleOlsen · Jul 15, 2013

If you look in the folder SIMATIC/Documentation/English/,
you will see a shortcut to a PDF 'STEP 7 - PID Temperature Control'.

Check out that first.

Kalle

PID Temperature Control

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