Skip to Content

SiePortal

The integrated platform for your product selection, buying and support workflow - bringing together Industry Mall and Online Support.

SiePortalDeutsch

Search

Home
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menu temporary not available
- Menue temporary not available
- {{item.title}}

Products & Services
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
MySiePortal MySiePortal
{{(apiData.MySiePortal | filter:{'rank':1}:true)[0].title}} MySiePortal
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Cart ({{apiData.CartCount}})

Navigation

AG_LRECV problem (S7-412H CP-443-1 and CP-343-1-lean connection)

Created by: Eli_47 at: 8/7/2017 9:43 PM (9 Replies)

Rating (0)

Thanks 0

10 Entries

8/7/2017 9:43 PM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	Good day. I trying to connect S7-412-3H and S7-317-2DP/PN via TCP connection between CP-443-1-advanced and CP-343-1-lean. I created TCP_connection on both sides and started data excharge. I am send data from S7-412-3H to S7-300 without any problem. But when i read data from S7-300 with AG_LRECV - always see old values on outlet of function (i see NDR changed from 1 to 0 and Status changed from 8181 to 0000 - this means data from s7-300 succesfully receved to S7-400). Any tips what can be wrong? P.S. For both master and slave S7-412-3H i created separated connection to S7-300. And Even i switch of standby plc Regards, Eli

Suggestion To thank Quote Answer

8/8/2017 8:12 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1056)	hi Eli_47, I am not sure if I understand it right. What block do you use on the S7-300? AG_LRECV? help says for S7-300 you can only use AG_RCV. regards, Attachment AG_RECV_help.jpg (106 Downloads)
	Last edited by: mopS04 at: 8/8/2017 8:13:18 AM FCK WAR! Be nice!
Suggestion To thank Quote Answer

8/8/2017 8:35 AM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	mopS04 hi Eli_47, I am not sure if I understand it right. What block do you use on the S7-300? AG_LRECV? help says for S7-300 you can only use AG_RCV. regards, Yes, inside S7-300 i used AG_SEND (FC_6), inside S7-400 i used AG_LRECV

Suggestion To thank Quote Answer

8/8/2017 9:17 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1056)	Eli_47 But when i read data from S7-300 with AG_LRECV - always see old values on outlet of function (i see NDR changed from 1 to 0 and Status changed from 8181 to 0000 - this means data from s7-300 succesfully receved to S7-400). hi Eli_47, this term is not really correct. The RECV-block receives data from the Ethernet CP. I found something that may help you, with your problem in this FAQ: How do you program the communication blocks FC50 and FC60? How do you program the communication blocks FC50 and FC60? Special case If the data exchange takes place via a TCP connection, then the output parameter "NDR" is only set if the entire receive buffer has been filled. The value of the output parameter "LEN" thus always indicates the total length of the receive buffer. So when you have an area of 100Bytes specified on the RCV and you are only sending 50 Byte, your NDR flag will be only set every second time. hope this helps, regards,
	Last edited by: mopS04 at: 8/8/2017 9:18:59 AM FCK WAR! Be nice!
Suggestion To thank Quote Answer

8/8/2017 12:11 PM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	mopS04 Eli_47 But when i read data from S7-300 with AG_LRECV - always see old values on outlet of function (i see NDR changed from 1 to 0 and Status changed from 8181 to 0000 - this means data from s7-300 succesfully receved to S7-400). hi Eli_47, this term is not really correct. The RECV-block receives data from the Ethernet CP. I found something that may help you, with your problem in this FAQ: How do you program the communication blocks FC50 and FC60? How do you program the communication blocks FC50 and FC60? Special case If the data exchange takes place via a TCP connection, then the output parameter "NDR" is only set if the entire receive buffer has been filled. The value of the output parameter "LEN" thus always indicates the total length of the receive buffer. So when you have an area of 100Bytes specified on the RCV and you are only sending 50 Byte, your NDR flag will be only set every second time. hope this helps, regards, But when i comment calling of function AG_SEND inside S7-300 - i continue see good state of connection inside S7-400. When i use AG_CTNL funtction with job 2 (reset connection) and reistablish connection to S7-300 i see new values (but only once). Very strange... Regards, Eli
	Last edited by: Eli_47 at: 8/8/2017 12:12:12 PM
Suggestion To thank Quote Answer

8/8/2017 5:42 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Eli_47, I wonder why you use TCP native instead of Iso-on-TCP when you are going to connect two S7-systems. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
Suggestion To thank Quote Answer

8/8/2017 7:37 PM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	Kaulquappe Hello Eli_47, I wonder why you use TCP native instead of Iso-on-TCP when you are going to connect two S7-systems. Regards, Kaulquappe Hi Kaulquappe. Do you think it is solved my problem if i will use ISO protocol?

Suggestion To thank Quote Answer

8/8/2017 9:03 PM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	Kaulquappe Hello Eli_47, I wonder why you use TCP native instead of Iso-on-TCP when you are going to connect two S7-systems. Regards, Kaulquappe And i cant understand - why S7-300 can read my data by AG_RECV, but inside S7-400 it is always work one cycle after i reset connection (By AG_CNTL function with job 2 ). And why if i comment AG_SEND inside S7-300, function inside S7-400 continue work like reading job done well...

Suggestion To thank Quote Answer

8/9/2017 8:31 PM	Rate (0)
Eli_47 Experienced Member Joined: 8/23/2012 Last visit: 2/19/2025 Posts: 118 Rating: (4)	And problem is solved.

Suggestion To thank Quote Answer

8/10/2017 9:17 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1056)	Eli_47 And problem is solved. solved by what? are you using ISO on TCP now?
	FCK WAR! Be nice!
Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on