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unconfigured communication

Created by: seppe.meeus at: 1/3/2011 8:42 AM (5 Replies)

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1/3/2011 8:42 AM	Rate (0)
seppe.meeus Posts: 8 Rating: (0)	Hello, I have a question about the communication between two siemens PLC. Because of the current application the communication network is not configured and goes over MPI. This MPI network is good when you send small amounts of data, so now my problem is that I need to transmit a larger amount of data and I want to go over to ethernet. I wanted to ask now if it is possible to transmit data over ethernet on a non-configured network, and wich functions can I use for this application? thx in advance, Seppe
seppe.meeus Posts: 8 Rating: (0)
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1/3/2011 8:51 AM	Rate (0)
seb_nancy Posts: 37 Rating: (0)	I don't think it s possible Why don't you want to configure a network via HW Config ?
seb_nancy Posts: 37 Rating: (0)
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1/3/2011 9:02 AM	Rate (0)
seppe.meeus Posts: 8 Rating: (0)	Because it is the communication between our PLC and the PLC of a contractor. So it is mainly for safety reasons and we only want them to use the data give to them. kind regards, Seppe
seppe.meeus Posts: 8 Rating: (0)
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1/3/2011 11:26 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	Hello seppe.meeus seppe.meeus I wanted to ask now if it is possible to transmit data over ethernet on a non-configured network, and wich functions can I use for this application? It is possible to do so without the need to configure a connectionvia NetPro and you can use the so called Open IE communication functions for this (i.e. FB63 TSEND, FB64 TRECV etc.). Having said that, I'm not too sure if this is really what you are after, moreso because of this requirement: seppe.meeus Because it is the communication between our PLC and the PLC of a contractor. So it is mainly for safety reasons and we only want them to use the data give to them. In this case, you may want to choose GET/PUT comms (FB14/15 in an S7-300, SFB14/15 in an S7-400) which do allowthe setup of a so called unilateral connection (e.g. you only configure the link in NetPro in ONE PLC and only call the Blocks in one PLC, there's nothing to be done in the Partner PLC).Get/Put dohowever only support smaller data volumes, if more is required BSEND/BRECV would be the better choice (they do however need a bilateral configured connection and calls of the comms blocks in both PLC's). Anyway, there's (un)fortunatelty plenty of choices of to be had when it comes tothis subject andthe best place to start is in my humble opinion the following compendium: CPU-CPU communication with SIMATIC controllers 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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1/4/2011 1:32 PM	Rate (0)
seppe.meeus Posts: 8 Rating: (0)	Thx for the help fritz! I have just one last question, it is about 200 bytes of data that needs to be transmitted. At this moment I am already sending +-100bytes with the put function, but when I want to increase this number, the values are not received in the other PLC. So I wanted to ask if it is possible to create a new connection with a different ID on the same ethernet interface for the last 100bytes? thx, Seppe
seppe.meeus Posts: 8 Rating: (0)
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1/4/2011 1:59 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	seppe.meeus So I wanted to ask if it is possible to create a new connection with a different ID on the same ethernet interface for the last 100bytes? This is a simple "yes it is possible and there'd be nothing wrong with doing so" answer in this case (you can add a third or fourth or more if need be until you run out of connection resources which are CPU dependent).
	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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