6/27/2013 4:11 PM | |
Joined: 4/20/2007 Last visit: 8/22/2024 Posts: 724 Rating:
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Are you using a dead band? |
6/27/2013 4:38 PM | ||
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating:
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Hello, it is recommended to change those parameters shown in attachment(mostly static variable of PID controller) in "inactive" mode to avoid malfunction of controller.It is recommendation from manual and I think better to be followed as we don't know what is really happening inside.
You method to put the controller to manual and back to auto again can be done by programming while error is near zero (SP=PV) But please make sure of bumpless transitions. Best regards Hamid Hosseini Attachmentparameters.pdf (1211 Downloads) |
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Last edited by: hdhosseini at: 6/27/2013 4:41 PM |
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6/27/2013 6:42 PM | |
Joined: 4/17/2012 Last visit: 8/30/2024 Posts: 474 Rating:
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Hi, For bumpless control what is the parameters i have to change???
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6/27/2013 9:21 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating:
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Hello again, as it is getting a long story, I just summarize some important points:
Hope that helps Hamid Hosseini |
6/27/2013 9:58 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating:
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about dead band in PID compact ,read it here: PID Compact S7-1200 Deadband
and case for related to bumpless switchover from manual to automatic and vice versa please refer to the following discussed topic in details: PID fb41 auto to manual modeFB58,Bumpless manual to automatic switchover |
6/28/2013 9:53 AM | |
Posts: 113 Rating:
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I appreciate you summary.... but. Gain scheduling is existing in SIMATIC range of product but not for S7 1200. Gain Scheduling worked in the S7-200 and so I expect it to work with the S7-1200. If Siemens had released information that Gain Scheduling wasn't going to be allowed for the S7-1200 then I could have made the decision to use a controller from another manufacturer. If you think there is some missing points in manuals related to PID compact in TIA, use this feature to inform moderators (Moderator). I really shouldn't have to tell a moderator that the manuals are deficient, I would suggest that it would be Siemens job to know that the manuals are deficient. For more advance options in regulation and process control use specialized tools and better controllers.Have a look here. This job won't stand the extra cost of an S7-300. The S7-200 performed the job perfectly well. If the S7-1200 is intended to be the replacement for the S7-200 then it should perform at least the same functions. I appreciate all the 'bells and whistles' that they have added to the S7-1200 and TIA Portal but I would suggest that perhaps they should have got the basics right before adding all the fancy stuff. You might not like people writing complaints about Siemens here, and maybe, in a couple (or more) of years when they have sorted out all the problems people will have less things to complain about. To give some perspective I created my first folder for S7-1200 related files 16 August 2010, Siemens have had almost 3 years to get things right. How long do we have to wait and how long do Siemens think that we will stay loyal to the brand? |
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