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Difference in S7 300 and S7 400

Created by: mohit at: 7/8/2009 9:30 PM (29 Replies)

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7/8/2009 9:30 PM	Rate (1)
mohit Posts: 89 Rating: (1)	What is the deffrence between Siemens S7-300 & S7-400 PLC?
mohit Posts: 89 Rating: (1)
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7/9/2009 4:25 AM	Rate (3)
Lucky123 Gold Member Joined: 12/20/2008 Last visit: 8/12/2024 Posts: 556 Rating: (237)	Hi Mohit, There might be different views for looking at the differences. However in Layman's Language S7-400 Systems are made for bigger complex and large machinery system where number of I/O's are higher and having much advanced features. Probably there will be a long list due to different parameters one will be looking at. I can give you an anlogy which probably makes you much more clear, Like the difference in Maruti-800 and Maruti-Zen. If you would have any question about particular S7 300 Module and 400 module then it would be easy to explain.

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7/9/2009 6:05 AM	Rate (3)
aikona Posts: 487 Rating: (36)	lalit Hi Mohit, I can give you an anlogy which probably makes you much more clear, Like the difference in Maruti-800 and Maruti-Zen. You learn something everyday , didn't know Maruti was a car.This side of the world I would compare a VW golf and an Audi quatro Below is a reply to a similar tread , stolen from Daniel .I hope he doesn't mind but I could not explain it better than this Hello; Siemens rates the S7-300 as a medium level PLC, and the S7-400 as a high-level PLC. So there are differences in work memory, processor speed, number of communication links and I/O connectivity. First point, the S7-400 family is rack-based (Multi-pin backplane linking all modules, from power supply to I/Os) whereas the S7-300 is a bus-linked platform (a serial connector links all modules). So essentially the physical layout limits the S7-300 back[plane exchanges to MPI speeds (187,5 Bits per second), whereas the S7-400 uses parallel connections over the backplane rack, permitting higher exchange rates, and a higher module-density. Second point, the form factor of the S7-300 is smaller, more compact than the S7-400, so this is something to take into account if space is a premium (inside a small machine panel, for example). Now, the higher S7-300 CPUs (especiatlly for the new S7-317 and S7-319)have specs that approach (and sometimes pass) the specs of lower end S7-400 CPUs, so the distinction is starting to blur. Hope this helps, Daniel Chartier Greetings Eric
aikona Posts: 487 Rating: (36)	Last edited by: aikona at: 7/9/2009 6:05 AM
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This contribution was helpful to 3 thankful Users dchartier Diniz_ JanMa1

7/10/2009 4:23 AM	Rate (0)
mohit Posts: 89 Rating: (1)	Thanks aikona very gud and clear explaination of the difference
mohit Posts: 89 Rating: (1)
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7/10/2009 4:24 AM	Rate (0)
mohit Posts: 89 Rating: (1)	Thanks lalit
mohit Posts: 89 Rating: (1)
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9/2/2009 10:54 PM	Rate (0)
Thermographer Posts: 2 Rating: (0)	The S7 400 is capable of "hot redundancy". In case of the master PLC failure, the secondary PLC can take over without missing a step.
Thermographer Posts: 2 Rating: (0)
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10/5/2009 3:45 PM	Rate (0)
jtoussaint Posts: 2 Rating: (0)	Hi everybody, Yours answers are really interesting, but I need more details. Is there any difference about communication management between S7-300 and S7-400? Thanks by advance. Best Regards,
jtoussaint Posts: 2 Rating: (0)	Last edited by: jtoussaint at: 10/5/2009 3:46 PM
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10/5/2009 5:04 PM	Rate (0)
mohit Posts: 89 Rating: (1)	Please go through the answer by aikona.
mohit Posts: 89 Rating: (1)
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10/5/2009 5:07 PM	Rate (0)
mohit Posts: 89 Rating: (1)	What is the difference in the CPU-315 and CPU-317.
mohit Posts: 89 Rating: (1)
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10/5/2009 6:02 PM	Rate (0)
miami Platinum Expert Joined: 8/31/2005 Last visit: 11/13/2024 Posts: 2198 Rating: (329)	mohit What is the difference in the CPU-315 and CPU-317. mainly performance, memory size and, of cause, theprice. e.g. calculating time, max size of FB, max number of FB.

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