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CP443-1 & AG_LSEND

8/30/2005 3:02 PM	Rate (0)
Import-User-1 Posts: 3609 Rating: (29)	Hi there, I am having a problem with TCPIP communication between 443-1 and a standard PC network card. Each time I call the AG_LSEND (called asynchroniously - i.e. on request not in the cycle) the connection breaks (not established), however after several calls (while not job done keep on trying) the connection gets established again and data exchange starts. When I request a send job CP's buffer reports that my CP sent a disconnect job to remote partner.After few cyclic calls of AG_LSEND everything comes right. Any idea what causes this weird behaviour?
Import-User-1 Posts: 3609 Rating: (29)
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8/30/2005 3:02 PM	Rate (0)
Import-User-2 Silver Member Joined: 8/10/2005 Last visit: 4/9/2024 Posts: 1486 Rating: (32)	Hello, the AG_LSEND/AG_LRECV should be called in the cycle. However, the programming of the AG_LSEND/AG_LRECV should comply with the guideline of asynchronous communication blocks. Therefore, I would recommend to adopt the samples provides at our internet pages: "Programming Example for the Send-Receive Interface with the Blocks FC50 (AG_LSEND) and FC60 (AG_LRECV) for S7-400" http://support.automation.siemens.com/WW/view/en/18513371 Please, keep in mind also the ERROR and STATUS= 0x7000 of the AG_LSEND and do not activate the function block again with a restart of that function! The restart may only be done after the DONE or ERROR <> 0x7000. Otherwise, you may run into a buffer overflow of the CP443-1 !! Furthermore, we recommend to set up the TCP connection with a PC according to the following FAQ: http://support.automation.siemens.com/WW/view/en/18843927

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