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Difference Between AG_LSEND/AG_LRECEIVE and AG_SSEND/AG_SRECEIVE

Created by: Maha at: 5/12/2010 10:53 AM (4 Replies)

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5/12/2010 10:53 AM	Rate (0)
Maha Posts: 118 Rating: (4)	Hi All, what are the difference between the AG_LSEND/AG_LRECEIVE and AG_SSEND/AG_SRECEIVE? What is the meaning Speed_Send and how it differs from Length_Send?
Maha Posts: 118 Rating: (4)
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5/12/2010 12:08 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 1/21/2025 Posts: 1548 Rating: (538)	It would seem that the speed send is for compatibility with S5 systems. It is explained in the following link:- Speed Send The long send is the normal interface for the S7400 interface to the CP443 CP's.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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5/12/2010 6:09 PM	Rate (0)
umencho Diamond Expert Joined: 3/21/2006 Last visit: 1/14/2025 Posts: 10239 Rating: (1182)	Hello, Also you could find info in http://support.automation.siemens.com/WW/view/en/26708188 Best regards, Hristo Mihalev

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5/13/2010 3:58 AM	Rate (0)
Maha Posts: 118 Rating: (4)	thanks for your reply. I already gone through the documents and links. My main doubt is what is the meaning of Speed Send. is it mean that it will take less time to send the data compare with AG_SEND and AG_LSEND. IF yes, then can u explain how its happening?
Maha Posts: 118 Rating: (4)
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5/13/2010 3:00 PM	Rate (0)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 1/21/2025 Posts: 1548 Rating: (538)	Good question. I am not sure of the answer though. I found the following in a manual:- The FCs AG_SSEND and AG_SRECV are for accelerated transfer of data by using optimized block communication between CPU and CP in the S7 station. The fast communication has no effect on LAN communication. These two blocks are supported as of STEP 7 V5.4 SP3. So it would suggest that the transfer will be faster using AG_SSEND and AG_SRECV - but don't quote me on that, as it is just my interpretation of the manual. I suppose the best way to find out is to test it.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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This contribution was helpful to 1 thankful Users Maha

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