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Processing Input image and DB's

Created by: Siemen-Stains at: 6/29/2006 8:06 AM (8 Replies)

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6/29/2006 8:06 AM	Rate (0)
Siemen-Stains Posts: 101 Rating: (0)	Is there a way to process data from a DB at the same time the input image gets processed? The problem has been, some data gets sent to the PLC via an OPC server and is not synchronized (assymmetric). Therefore the data can enter anytime during the cyclic proccess, this is having an effect with logic that is scan dependant eg oneshot information. Some buttons configured in the SCADA dont get to operate in the PLC at times. The button sets the bit and the PLC at end of scan resets these bits (bottom of ob1) If the information comes in from SCADA after the logic that requires it, but before the reset in ob1 it never actions.
Siemen-Stains Posts: 101 Rating: (0)
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6/29/2006 8:31 AM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 11/7/2024 Posts: 4780 Rating: (729)	I'd say that your solution is wrong. Think it over.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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6/29/2006 10:07 AM	Rate (1)
Thijs Posts: 121 Rating: (16)	Maybe instead off resetting all OPC data at the end off the OB1 scan. Try to reset the OPC command after procesing it. Another solution is at the start of OB1 copy all OPC command into a seperate DB and reset the OPC command DB. Then proces the DB in your PLC program. In the end of the OB1 scan you can than reset the PLC command DB.
Thijs Posts: 121 Rating: (16)
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6/29/2006 11:23 AM	Rate (1)
Chris Silver Member Joined: 8/31/2005 Last visit: 10/24/2024 Posts: 217 Rating: (41)	Hi! AFAIK, there is no possibility to process data from a DB at the same time the input image gets processed. If you want to receive data from the OPC server (only) at the beginning of each cycle (and you are using the SIMATIC NET OPC Server), you could use the "Buffer-Oriented Services with the OPC Interface". This OPC communication is based on S7 communication protocol with the BSEND and BRCV blocks. By using this service, the OPC data is only received, when you call the BRCV block (e.g. at the beginning of the OB1 or in the OB35). For more informations have a look here: Industrial Communication with PG/PC (Chapter 2.14 Buffer-Oriented Services with the OPC Interface) This application also uses the "Buffer-Oriented Services with the OPC Interface": Mass Data Acquisition with an OPC Client in C# based on .NET (there you can have a look at the STEP 7 project with the BRCV calls)
	Last edited by: Chris at: 6/29/2006 11:26 AM Last edited by: Chris at: 6/29/2006 11:26 AM Greetings, Chris
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6/30/2006 1:45 AM	Rate (0)
Siemen-Stains Posts: 101 Rating: (0)	[quote user="jacek d"]I'd say that your solution is wrong. Think it over. gee thanks mate youre a real help. the first 1 applies to you.
Siemen-Stains Posts: 101 Rating: (0)	Last edited by: Siemen_Staines at: 6/30/2006 4:32 AM
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6/30/2006 1:58 AM	Rate (0)
Siemen-Stains Posts: 101 Rating: (0)	[quote user="Thijs"]Maybe instead off resetting all OPC data at the end off the OB1 scan. Try to reset the OPC command after procesing it. Another solution is at the start of OB1 copy all OPC command into a seperate DB and reset the OPC command DB. Then proces the DB in your PLC program. In the end of the OB1 scan you can than reset the PLC command DB. thanx Thijsyou were on the money
Siemen-Stains Posts: 101 Rating: (0)
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6/30/2006 1:58 PM	Rate (1)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 11/7/2024 Posts: 4110 Rating: (195)	Hello all, this is a technical forum for technical problems, whatever problems - easy or difficult problems. Please attend to your accent. [;)] Best regards CS Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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7/6/2006 12:10 AM	Rate (0)
Siemen-Stains Posts: 101 Rating: (0)	??? what do you mean? do you mean 'please speak appropriately to each other' if so who are you refering to?, i hope its jacek, as his post was a complete missuse of the forum.
Siemen-Stains Posts: 101 Rating: (0)
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7/6/2006 9:09 AM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 11/7/2024 Posts: 4110 Rating: (195)	In this thread was a posting, which was unworthy for adult people. That is why I have deleted this posting and I write my posting regarding the accent. With my posting I meant also all users, which possibly read and write in this thread. Best regards CS Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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