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| 5/16/2014 7:40 PM | |
Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating:
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Hello BeVee Presently we have 3 Nos. S5 95Us communicating with a S5-135U on SINEC-L2. Apprx 16 Input words + 16 Output words are being exchanged between the systems. We want to replace the S5 135U which is having periodic problems with a S7-300 system, ( CPU 315-2 PN/DP ) Presently we have proposed to replace the whole system with S7-300 CPU + IM151-8 based systems in place of the present system. However customer wants to retain the S5 95Us if possible as these are working fine. ( These may be replaced in the next phase ) Cheers Navnag |
Last edited by: Navnag at: 5/16/2014 7:43 PMThere is no such thing as the last bug in a program |
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| 5/17/2014 3:03 AM | |
Joined: 10/7/2005 Last visit: 10/4/2024 Posts: 3024 Rating:
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Hello Navnag FDL communciation is what you are looking for to link your S5-95U (6ES5 095-8MB02) to an S7. Have a look at Solution for S5 and S7 CPU commnication which should contain all the relevant info and links you are after. |
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| 5/17/2014 7:30 AM | |
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Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating:
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Thanks fritz This is exactly what i was looking for. Cheers Navnag |
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There is no such thing as the last bug in a program |
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| 5/21/2014 12:44 PM | |
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Joined: 10/7/2005 Last visit: 10/4/2024 Posts: 3024 Rating:
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No need to worry about this, FDL does take care of managing bus access just like Profibus DP does (which uses FDL on layer2as well and simply adds the DP part in Layer 7 of the ISO/OSI model). Put simple, every station in your FDL Network is an "active" station and token passing takes place between these just like it would between multiple Profibus DP Masters in a DP Multimaster Network (and this is handled in both cases by FDL on layer 2, see also What properties, advantages and special features does the FDL protocol offer? for more). In other words, collissions can not take place in an FDL network and there is no need to create a sending-receiving scheme between the PLC's yourself. Having said that, as you have to program Send/Recive calls to exchange data between your S7 and S5's , you still need to "manage" the Send calls as you would with all other forms of Send/Receive communciation (e.g. check is previous send has finishedsuccesfully before starting the next one etc.). The other thing to be mindful of is the setup of the Profibus bus timing values. In the 95U's it is done in DB1 and you should make sure that they all match up across all 95U's (should be the case already as these exist but best be checked) as well as your S7 (where you'llfind and set them up in the Proifbus parameters of your CP342-5 Profibus Network) I hope this helps |
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