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10/17/2013 4:23 PM | |
Joined: 1/28/2009 Last visit: 8/5/2024 Posts: 6844 Rating:
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Hello, I suggest checking "7.2.1 Consistency of communication blocks and functions " of this manual for more information.While using communication functions in source and target with proper signals, consistency of data can be ensured by checking feedback of receiving function.For OPC,I think you need to implement such a strategy in your program.
Consistency of communication blocks and functions With S7-400, communication jobs are not processed in the cycle control point but rather in fixed time slices during the program cycle. The system can always process t he data formats byte, word and double word consistently, i.e. the transfer or processing o f 1 byte, 1 word = 2 bytes, or 1 double word = 4 bytes cannot be interrupted. If the user program calls communication blocks such as SFB 12 " BSEND" and SFB 13 "BRCV", which are only used in pairs and access shared data, access to this data area can be coordinated by the user by means of the "DONE" parameter, for example. The consistency of data transmitted locally with these communication blocks can thus be ensured in the user program. Best regards, Hamid Hosseini |
Last edited by: hdhosseini at: 10/17/2013 4:27 PM |
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