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Communication between S7-400 and S7-300

Created by: Kramps at: 2/6/2007 9:25 AM (4 Replies)

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2/6/2007 9:25 AM	Rate (0)
Kramps Posts: 66 Rating: (2)	Hi, I would like to establish a communication between a S7-400 Rack (mainly composed of a CPU 416-3DP and CP443-1) and a S7-300 (whom configuration i don't exactly know as it's a CPU used by our client). I use STEP7 v5.4 I have to send at maximum let say 100 real from the S7-300 to the S7-400 (no communication needed ont the other side). I suggest to simply use "Global data" function of STEP7. My question is : Does "Global data" only work with MPI Network ? If Industrial Ethernet can't be used for "Global Data", where can I find documentations about how to program the communication (using SFBs or SFCs I suppose) ? Thanks for answering, Best Regards, Kramps.
Kramps Posts: 66 Rating: (2)
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2/6/2007 9:45 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/24/2025 Posts: 8808 Rating: (1177)	Hello Kramps, Yes, Global data is only for MPI Have you seen this link: http://support.automation.siemens.com/WW/view/en/1819293 You can use PUT and GET functions. Perhaps it's usefull Best regards, Wizard

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2/6/2007 10:22 AM	Rate (0)
Kramps Posts: 66 Rating: (2)	Ok, this is helpful, thanks ! Do we know the name of the protocol used for this Industrial/ethernet communication (xxx over on TCP/IP I suppose) ? Just for being curious, is it possible to established a such communication via Profibus without using a DP/DP coupler ?
Kramps Posts: 66 Rating: (2)
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2/6/2007 10:38 AM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Hi Kramps, if you have 100 Real values you have 400 Byte of Data. This is far to much for 1 Request for PUT / GET, besides Ind. Ethernet if you have only S7-400 Systems. The S7-300 System does only support about 180 Bytes in one request. As we do not know what HW you have on both systems I would even recommend to check if you can do Send / Receive on ISO on TCP Protocol. This Protocol can easyly handle the amount of data and is quite fast and secure. This is just a recommendation. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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6/21/2016 9:14 AM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by Desi boyz is split to a separate thread with the subject Communication and setup data exchange between s7-400 & s7-300 station. Best regards Min_Moderator

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