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S7-CPU317-2 DP - Multiple PID blocks?

8/3/2010 2:55 PM	Rate (0)
markallinson Posts: 20 Rating: (0)	Hi All, I have a requirement to control the pressure on 10 gas introduction modules. I have setup a PID block to control the pressure on one of these modules and this works well, I'm using FB41 inside OB35 for the PID part and I'm using FB43 to generate the required pulses to open and close the fill / pump out lines as required. Now that I wish to extend this to the other 9 lines I figure I'll have to have 10 PID blocks (FB41) in OB35, one for each Gas Line, then process 10 FB43'a to operate the required valves. Does this sound correct, sorry the PID functions of the PLC are new to me. Thanks in advance Mark
markallinson Posts: 20 Rating: (0)
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8/3/2010 3:19 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Yes, you can do so. But any PID - FB need its own Instance - DB!
IBN-Service Posts: 8946 Rating: (1000)
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8/4/2010 10:47 AM	Rate (0)
markallinson Posts: 20 Rating: (0)	Cool, thanks for the prompt reply
markallinson Posts: 20 Rating: (0)
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8/14/2010 5:19 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	Hi Please check the memory requirement for selected function. when number of functions increases, memory usage is crucial.Check attachment for Modular PID functions. Regards hdhosseini Attachment PID2.zip (500 Downloads)
	Demo Channel on Youtube
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