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SIMATIC 545, Ethernet 2572 card with Multiple S7 PLC communication.

Created by: DUTTA at: 10/27/2008 9:44 PM (7 Replies)

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10/27/2008 9:44 PM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Dear Experts, I have SIMATIC 545 PLC with 2572 Ethernet Card. I need this PLC to communicate with two S7 400 PLC. S7 PLC has CP443 cards. I have taken care from S7400 side. I have created ISO On Ehternet connection. Also given TSAP ID. At present the 545 is talking with one S7 300 PLC. Now I want to communicate it with other two new s7400 PLCs. I have two diff. parameterized V memory area in 545 for these new S7400 PLCs. But how can I write down codes in Lader logic so that it can open and close the connection accordingly. Does anyone has the example in which this kind of connection handling logic shown? Guide me. Dutta
DUTTA Posts: 102 Rating: (1)
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10/28/2008 12:45 AM	Rate (0)
billwest Posts: 510 Rating: (119)	Are the 400's a redundant pair? Can you send me the 400 configuration? You said you confiured the communications for ISO on Ethernet, did you mean ISO on TCP? Bill
billwest Posts: 510 Rating: (119)
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10/28/2008 9:34 PM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Hi Thank for the reply billwest . Yes s7400 is redundant. and also 545 PLC is. it has two diff. 2572 Ethernet cards. From S7 400 side I have configured ISO on TCP connection for these two 545 PLC, by inserting two "other Station". I have given appropriate TSAP and TCP/IP address. Also configured S7400 as Active partner. This should be OK. But in 545 I have already one S7 communication Logic exists in Ladder part. which is working fine. Now question is how to modifiy or write the new logic for these new PLC communication? Is there anything that I can Open the connection with command word and control the send recieve flow by changing IP and TSAP address from V-Memory? Is it possible? Guide me. Dutta
DUTTA Posts: 102 Rating: (1)
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10/29/2008 3:28 AM	Rate (0)
billwest Posts: 510 Rating: (119)	This is from a note on page 57 of the CTI 2572 ETHERNET TCP/IP MODULE, INSTALLATION AND OPERATION GUIDE, Version 2.4, CTI Part # 062-00146-024 If you choose to open an Active connection, the partner must not open an Active connection. For S7 communications, ensure that the Active selection is not enabled. Configuring the 2572 as the Active partner tends to establish the connection quicker. I would set the 545 as the active partner. The 2572 uses command blocks to manage connections and transfers. The second word of the block is the command code. 2E01 = Open Active Connection 2E03 = Send 2E04 = Receive 2E05 = Close Connection Since you have the connection with the 300 working you probably used the code examples from Section 5.4 of the above referenced manual. So every time you close the connection (command 2E05) you will have to change the the IP address stored in words 4 and 5, The local TSAP information in words 7 and 8 can stay the same. The Remote TSAP information in words 9 and 10 must be changed to reflect the new partner. For the Send and Receive Blocks, you have to change the The number of words and the starting V Memory address (words 4 and 5) Repeat the process as many times as required, then start over again. Bill Attachment 2572cti.pdf (849 Downloads)
billwest Posts: 510 Rating: (119)
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10/29/2008 1:58 PM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Billwest, The existing connection with S7300 in the current program of 545 is passive. And this communication is working and under continous production. So as per the manual instruction I have to change this existing communicaiton. So can I change the logic by closing connection everytime but keeping 545 as passive partner. Is it going to work in this way? regards, Dutta.
DUTTA Posts: 102 Rating: (1)
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10/29/2008 2:46 PM	Rate (0)
billwest Posts: 510 Rating: (119)	Closing and openning the connection takes time. As the note in the manual said, it is faster to make the connection if the 2572 is the Active partner. You can do it as the passive partner, but if timing becomes an issue, you may have to switch the 2572 to the active partner to improve performance. Either partner can close the connection. Fromm the manual: Necessary conditions for a successful OPEN PASSIVE CONNECTION are: · The connection number is within the valid range and has not already been used, · The TSAP strings can be successfully read from V memory, · The TSAP is not already being used by another connection. · The TSAP pair and IP address parameters match the specification in the command block NOTE: Because an Open Passive connection must wait for an Active partner to connect, no error is returned if the Active partner is not present. You must access the connection with a Send or Receive command in order to detect that the partner has not connected. How much data are you passing and at what frequency? Bill
billwest Posts: 510 Rating: (119)
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10/29/2008 3:40 PM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Hi, Its 100 Words send to S7 and 100 Words receive from s7. So to write down the switching logic for IP and TSAP and V memory, What are the other parameter I need to check? I mena you told me to monitor the close conncection command so what else is required to monitor. Should I monitor the error word also in this case? or just colse command detection is enough for switching the data? Thanks again for helping me. regards, Dutta
DUTTA Posts: 102 Rating: (1)
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10/30/2008 12:41 AM	Rate (0)
billwest Posts: 510 Rating: (119)	I have taken the pages from the manual with the 505 code and annotated it in PDF. I hope this will help you. Yell if you need more Bill Attachment Pages from 505-8132-2.pdf (857 Downloads)
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