5/2/2011 10:01 AM | |
Joined: 10/7/2005 Last visit: 9/24/2024 Posts: 3022 Rating: (1054)
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Hello Mushriq if I understand you correctly you only have a handlful of DP Slaves that you want to connect to the CPU, correct? If that's the case (or even if it is a few dozen DP Slaves) I wouldn't worry too much as the CPU can easily handle it. The absolute I/O limits of the 319-3 PN/DPcan be found in the technical spec (see HERE for more) and are: - 8 Kbytes of I/O's address area in general. - 124 DP Slaves per DP Master port (of which your CPU has two and you can add more via CP342-5 if need be). - 244 bytes of cyclic I/O data per DP Slave (this is a Profibus standard value and applies for any DP slave). I hope this helps |
Cheers |
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5/2/2011 11:06 AM | |
Posts: 947 Rating: (45) |
In additional: Without repeaters you can connect max 32 node (slave). |
Last edited by: gre_m at: 5/2/2011 11:07 AM |
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3/23/2014 6:00 PM | |
Posts: 17 Rating: (0) |
Dear Sir, What if i need to add more than 32 slave. Thanks and waiting for your reply.
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3/24/2014 11:49 AM | |
Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating: (707) |
Hello Hazem, Check specification of your CPU if more than 32 slaves. |
3/24/2014 5:47 PM | |
Posts: 17 Rating: (0) |
Dear Sir, Actually i can not find it in the properties in the CPU, could you tell where is it. Thanks & waiting for your reply.
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3/24/2014 9:06 PM | |
Posts: 17 Rating: (0) |
Dear sir, it is 414 !!
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3/25/2014 1:53 AM | |
Joined: 9/27/2006 Last visit: 9/23/2024 Posts: 12282 Rating: (2685) |
Just a little consideration on your statement above: Taking repeaters into account in the hardware configuration Except for the diagnostics repeater the devices listed below do not need to be configured in the hardware configuration, because the are transparent for the DP master. Only the diagnostics repeater has to be configured as a DP slave with its own DP address because of the diagnostics data to be transferred.
However, under certain circumstances you have to take into account implementation of these devices when configuring the network. In the Properties of the DP master system you open the Cable Configuration dialog via "Properties...> Tab: Network Settings > Options...> Tab: Cables". Here you enter the number of repeaters used and the cable length of the network (in km). If the number of repeaters and the cable length are not taken into account, then there might be sporadic or even permanent damage to the cables. Just food for thought, I always enter the number of repeaters I use in a project in the bus properties so the Profibus configuration software can take these into account when calculationg the TBits and the token rotation times. Hope this helps, Daniel Chartier |
This contribution was helpful to1 thankful Users |
3/25/2014 4:25 AM | |
Joined: 10/7/2005 Last visit: 9/24/2024 Posts: 3022 Rating: (1054)
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Hello Hazem Malik in that case 32 DP Slaves may very well be the maximum assuming you use it's 1st onboard MPI/DP interface. Depending on the exact type of 414 that you have, you could use its second (dedicated) DP port and/or add an IF 964-DPinterface to the CPU(in which case 96 DP Slaves is typically the limit). Alternatively, you can a CP443-5 EXTto your S7 system which allows 125 DP Slaves (the max. possiblefor a DP master interface) I suggest you type in the exact part number of your CPU in the search field here and check its techncial specwhich will clearly tell you how many DP Slaves are allowed for each of itson board interfaces (see for example 6ES7414-3XM05-0AB0or 6ES7414-3EM06-0AB0 etc. etc.). I hope this helps |
Last edited by: fritz at: 3/25/2014 5:29 AMAdded CP443-5 info and CPU examples Cheers |
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