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Is there a limitation on the number of communication links a 1214C CPU can have?

Created by: JERA-DK at: 3/13/2012 10:53 PM (6 Replies)

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3/13/2012 10:53 PM	Rate (0)
JERA-DK Posts: 9 Rating: (0)	Pegaia Hi, Here there is a sample program to TCP data exchange between two S7-1200. Tips on programming: 1 – You can use the blocks TSEND_C and TRCV_C 2 – Select the blocks on the ladder (with instance db). In the bottom window, there are the connections properties. 3 – Connection properties: 3a - You can select a partner CPU if both are in the same project. If it is not the case, select “unspecified”. 3b - One, and just one, of the two partners should be the active for establishment of the connection. 3c – Connection ID: it should any number. It will be used as reference on the blocks to related connections parameters and blocks actions. So, each connection in a PLC should be its own number. 3d – Port: If the TCP IP address is like an address number of the street. The Port is like the apartment number. 4 – Block parameters: 4a – REC is triggered by edge (0->1). Fill it, for example, with a clock memory. 4b – Cont: if you use this communication continuously, set it as true. Attachment:TCP IP.zip (820 Downloads) Thanks for the sample. Is there a limitation on the number of communication links a 1214C CPU can have? I am going to start planning a project with 8 pcs. 1214C (all withone basic HMI panel) and theyhave toexchange data with each other (48 bytes telegrams). The individual CPUs is in its own project, so communicationwill beas unspecified partner. Will this work or is there a limitation in communication with S7-1200? If it will work, what is the best way to make the communication.
JERA-DK Posts: 9 Rating: (0)	Last edited by: O_Moderator at: 3/14/2012 10:50 AM Last edited by: O_Moderator at: 3/14/2012 10:50 AM new subject after splitting from /tf/WW/en/Posts/46768#top
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3/14/2012 7:33 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/19/2025 Posts: 10239 Rating: (1183)	8 for Open User Communication (active or passive): TSEND_C, TRCV_C, TCON, TDISCON, TSEND, and TRCV 3 for server GET/PUT (CPU-to-CPU) S7 communication 8 for client GET/PUT (CPU-to-CPU) S7 communication Best regards, Hristo Mihalev

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3/22/2012 7:38 AM	Rate (0)
JERA-DK Posts: 9 Rating: (0)	UMENCHO 8 for Open User Communication (active or passive): TSEND_C, TRCV_C, TCON, TDISCON, TSEND, and TRCV 3 for server GET/PUT (CPU-to-CPU) S7 communication 8 for client GET/PUT (CPU-to-CPU) S7 communication "8 for Open User Communication" How do these numbers be understood? Is this number of partners or connections? If it is connections then a S7-1200 can only communicate with 4 other s7-1200,because there are a send and receive connection to each partner. If it is so, then I could not get my project mentioned above to work.
JERA-DK Posts: 9 Rating: (0)
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3/22/2012 1:20 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/20/2025 Posts: 15736 Rating: (2488)	If you want to link up 8 S7-1200 PLCs and a single HMI, it might look something like this: Master<----> HMI \|\|\|\| \|\| \| \===================sub-Master4 \|\|\| \|\|\===========sub-Master3 \|\| \ \|\| \=================slave3-1 \| \=======sub-Master2 \| \ \==sub-Master1 \======================slave2-1 \ \==============================slave1-1 sub-Master1-3 would get data from their respective slaves and pass it up to the single master accessible to the HMI. There may be simpler approaches to this, but this allows for growth in the number of PLCs without a lot of change to each master/slave.
	science guy
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3/22/2012 10:34 PM	Rate (0)
JERA-DK Posts: 9 Rating: (0)	In the system are8 S7-1200 (1214C) and they are all withone basic HMI panel. All 8 PLC systems is going to exchange data with the other PLC's in the system. In the system there isone master PLC there will have the production setup for the system. There is 6assembly lines and they is receiving the setup datafrom the master and sending production data back to the master. There is 1 conveyor transfercar distributes the material between the assembly lines, so itmust communicate with all of the assembly lines.
JERA-DK Posts: 9 Rating: (0)
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3/22/2012 11:37 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/20/2025 Posts: 15736 Rating: (2488)	The sub-Masters would take on the task of communicating to any slaves on behalf of the master, and relay any slave data up to the master. I've done something similar in the past when I ran out of connections.
	science guy
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3/23/2012 12:27 AM	Rate (0)
fritz Diamond Member Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	JERA-DK "8 for Open User Communication" How do these numbers be understood,is this number of partners or connections? Hello JERA-DK it is - in simplistic terms - the number of Partners andeach connection is a "two way street" so you can have a TSEND/TRECVpair in each PLC using the same connection. In your case (8 * S7-1200 PLC's that all need to talk to each other), you'll be as such just fine with using OUC (each S7-1200 will handle 7 OUC connections). Youcould even add one more S7-1200 to the system before you reach the limit (in which case you couldadditionally use S7 communciations). One more thing to note about OUC's (Open User Communications): The PLC program is not only in charge of establishingthe connection(e.g. via TCON or TSEND_C/TRCV_C), but can of course also disconnect them again(e.g via TDISCON or TSEND_C/TRCV_C). What this means is that you can dynamically establish a connection and exchange data with a PLC, then disconnect itand now do the same with another PLC and so forth and so forth. This ability to multiplex communication related connections means that you can theoreticallydo data exchange with an unlimited amount of Partner PLC(bearingin mind that the overall refresh rate of the data will get slower and slower the more you multiplex). Anyhow,below is a link with some more offcial stuff and number of supported connections and I hope this helps (chapter 10.2.2. of the S7-1200 manual has some good information about this too): With which devices can the S7-1200 communicate via the integrated PROFINET interface and which protocols support the S7-1200?
	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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