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TSAP's in ISO-connection

Created by: Simotion at: 5/28/2011 8:30 PM (4 Replies)

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5/28/2011 8:30 PM	Rate (0)
Simotion Posts: 223 Rating: (1)	Today I had to solve a communication problem between two S7 414 cpu's. They had ethernet communication cp's and the protocol was pure ISO. They told me the communciation had been working in the past. I exchanged the cp's and cpu's, checked the network, but nothing helped. Plc 1 had an iso-connection to plc 2 and plc 3. Plc2 only had an iso-connection to plc 1. For the communciation between plc 1 and 2 (the one that was not working), plc 2 was the active connection partner. I saw that the TSAP-name for the two connections in plc 1 (to plc 2 and plc 3) were both 'Iso-1'. I finally made plc 1 active connection partner for the communciation with plc 2 and changed for that communcation TSAP-names to 'Iso-2'. Then it worked . Is it not allowed that you have identical TSAP-names for multiple connections in one cpu although the connections might be to different cpu's? What are the rules and restrictions for TSAP-names?
Simotion Posts: 223 Rating: (1)
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This contribution was helpful to 2 thankful Users luis17 AutoGen_2143386

5/29/2011 2:21 AM	Rate (0)
Krish Silver Member Joined: 5/24/2007 Last visit: 4/24/2024 Posts: 284 Rating: (27)	Hi The TSAP communications must have unique addresses because actually they are used for data transport and verification. I think it is a very easy procedure to have a unique name for each connection and so reliability in communication is acheived.. Krish

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5/29/2011 9:01 AM	Rate (0)
Simotion Posts: 223 Rating: (1)	Krish Hi The TSAP communications must have unique addresses because actually they are used for data transport and verification. I think it is a very easy procedure to have a unique name for each connection and so reliability in communication is acheived.. Krish Also if two connections point to another plc?
Simotion Posts: 223 Rating: (1)
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5/29/2011 12:48 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/14/2025 Posts: 3042 Rating: (1061)	Simotion Is it not allowed that you have identical TSAP-names for multiple connections in one cpu although the connections might be to different cpu's? It is allowed dear Simotionand a "re-use" of "ISO-1" happens by default for a newISO connection to another PLC. The question in your case is: What TSAP's were originally configured in the partner PLC (perhaps they didn't match after you replaced the CPU and CP and started off with default values)? Anyway, below are the "rules"governing ISO connections which aretaken straightfrom the S7-CPs for Industrial Ethernet Configuring and Commissioning Manual Part A − General Application manual, (seechapter 5.4 for more): An ISO transport connection is specified by the local and remote connection endpoint. Local addresses: Local MAC address and local TSAP Remote addresses: Remote MAC address and remote TSAP Remote and local TSAPs can be identical since the connection is uniquely identified by the different MAC addresses. If you require more than one connection between two stations, the TSAPs must also be different. During configuration of the local and remote TSAPs, defaults (can be changed) are proposed (for example, ISO−1 for the first connection between two partners). If new connections are configured between the same partners, the default values are automatically incremented (for example ISO−2 etc.). With a new connection to a new partner, the value ISO−1 is used again. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users luis17

5/29/2011 7:22 PM	Rate (0)
Krish Silver Member Joined: 5/24/2007 Last visit: 4/24/2024 Posts: 284 Rating: (27)	Hi Yes, each connection needs to have a unique address on the sending side and the receiving side. Krish

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