7/9/2013 5:25 PM | |
Posts: 5 Rating: (0) |
Hello all, I believe the S7-300 allows 4 racks with 8 IO cards/rack for 32 cards/4 racksmaximum. I have an existing PLC cabinet with 3 racks but the CPU is not part of the backplane with any IO cards so I'm wondering if this qualifies as 4 racks? Attachments7300.pdf (812 Downloads) |
7/9/2013 8:20 PM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839)
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Yes. Hot Swapping is not possible in S7-300 Series.
If Rack Failure OB86 is called, then the CPU will still in run mode, the rack failure will be triggered, Bus fault will trigger and Ext. Fault.
Please have a look on thisthread Special considerations for S7-300 and OB83
Hope this helps. |
Last edited by: Ayman Elotaify at: 7/9/2013 8:21 PMtypo Ayman Elotaify |
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This contribution was helpful to1 thankful Users |
7/9/2015 3:57 PM | |||||||||||||||
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685) |
Hello Yasmeen; Let's start by clearing up an issue: you are discussing 2 very different things. First, there is the S7-300 hardware installation capabilities. This is analyzed in the following documents:
- S7-300 CPUs centralized racks (up to 4 Racks, 32 modules) S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP See the attached picture, taken from this manual. SIMATIC S7-300 S7-300 Module data (see the section on Interface Modules) - Connecting cable for IM 360 and IM 361, or IM 361 and IM 361 1 m 6ES7 368-3BB01-0AA0 2.5 m 6ES7 368-3BC51-0AA0 5 m 6ES7 368-3BF01-0AA0 10 m 6ES7 368-3CB01-0AA0
- The other issue is Profibus-DP connections for a S7-300 CPU or Cp 342-5 Profibus master. This is independant of the fact that a Siemens CPU is being used, it applies to any CPU from any manufacturer that has a Profibus-DPO master interface. Using Profibus-DP slave interface modules (such as the IM 153-2) you can connect up to 125 slave stations on the DP master's bus. See the documents from Pro0fibus International:
http://www.profibus.com/download/installation-guide/
If you look at the technical data of your S7-300 PU, you will find this type of information, showing the differences between centralized and distributed IO:
For example, the CPU 313C-2DP: 6ES1313-6CG04-0AB0, shows:
Hope this helps, Daniel Chartier
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