[?]: s7-300 PID temperature control for heat/cool operation

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badr3
Posts: 6
Joined: Wed Jul 13, 2011 9:08 am

[?]: s7-300 PID temperature control for heat/cool operation

Post by badr3 » Wed Jul 13, 2011 9:21 am

I'd like to ask a question,
is there a PID function block for heat/cool operation for s7-300

Best regards.

dsekulic
Posts: 186
Joined: Sun Feb 12, 2006 5:47 pm
Location: Europe

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by dsekulic » Wed Jul 13, 2011 11:51 pm

Hi,
Try function blocks FB58 (Continuous Temperature Controller "TCONT_CP") and FB59 (Temperature Step Controller FB59 "TCONT_S")
Search word(s): pid temperature control
regards

badr3
Posts: 6
Joined: Wed Jul 13, 2011 9:08 am

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by badr3 » Thu Jul 14, 2011 11:12 am

many thanks for your replay ,
i need a function block with two settings (pid parameters), one for heat and the other for cool.
concerning heat i will use SSR for heats , and for cooling i will use relay for blowers

dsekulic
Posts: 186
Joined: Sun Feb 12, 2006 5:47 pm
Location: Europe

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by dsekulic » Thu Jul 14, 2011 5:30 pm

Hi,
I don't know what SSR stand for, but for turning on/off of blower You can use Pulse generator output (take a look pages 25-27). Parameters of PID function block You can find on appendix A.3.
regards

dmitry_79
Posts: 149
Joined: Sun Dec 20, 2009 1:30 pm
Location: Russia

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by dmitry_79 » Mon Jul 18, 2011 5:16 am

The Regulator of the cooling differs from regulator of the heating, that that when cooling is used negative factor to propotions.

Excuse me for my english...

dsekulic
Posts: 186
Joined: Sun Feb 12, 2006 5:47 pm
Location: Europe

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by dsekulic » Mon Jul 18, 2011 12:23 pm

You can use one PID regulator with mapping of output manipulated value for heating and for cooling. If error is positive than You use mapping for cooling and vice versa.
regards

Scarch
Posts: 103
Joined: Fri Aug 31, 2007 8:17 pm
Location: Europe

Re: [?]: s7-300 PID temperature control for heat/cool operat

Post by Scarch » Sat Sep 10, 2011 9:33 am

FB59, it is the typical application for an extruder, with heating resistors and cooling fans. I have used it several times.

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