发表于:2002-03-18 14:01:00
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Difference between PROFIBUS and Industrial Ethernet
Feb 22, 2002 11:54 am, by Jose Sousa
Subject : Communications
Text :
I will take a decision to choose a method of communication between S7-300 PLCs. I do not if i use PROFIBUS or Industrial Ethernet. Can anyone give some help.
Best Regards
Jos?Sousa
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 23, 2002 11:03 am, by CJ
PROFIBUS is A Token Network base on RS485,and for that is more safe. Industrial Ethernet is, as the name tell, Ethernet,faster but less safe.
Best Regards CJ for more information go to http://www4.ad.siemens.de/
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 24, 2002 12:43 pm, by David Lawton
If your network will purely be Siemens kit I"d stick with Profibus. If you have other manufacturers kit involved I"d be tempted to go
ethernet. The other thing to consider is the comms speed vs. how robust it needs to be, as mentioned already
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 24, 2002 12:52 pm, by R.A. Hulsebos
Can you explain why the presence of a token
makes a network more <quote>safe<unquote> ?
Ethernet isnt always faster than Profibus
either, because it has a much larger overhead,
and the 10 Mbit/s is just used to compensate
that. Do some calculations before you make
a decision!
Rob Hulsebos
rahulsebos@cs.com
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 25, 2002 10:44 am, by david mertens
Both networks can be used for this type of communication with the same reliability (When S7 connections are used in both cases) and the same
programming effort. The costs will also be similar (CP341-1 versus CP341-5), both systems offer the possibility to construct redundant
rings, etc... However, the future trend is more towards ethernet. One advantage of industrial ethernet is speed, up to 100Mbit/s versus
12Mbit/s for profibus. Future releases of siemens CPU"s will have on-board ethernet connections, making this the default standard for
communication.
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 26, 2002 3:49 pm, by Gabriele Corrieri
I not agree these opinions ... I"d remember that only ProfiBus (and all of
other fieldbus, but not Ethernet) is deterministic ... the cyclic query on
slaves on ProfiBus is time-determinated by token-passing, on Ethernet there
is a CSMA/CD, otherwise called "casual access to bus" (is not the
explanation of CSMA/CD but is very near to the reality), every
bus-partecipant access to bus only when it had to exchange datas, and for
example can access to bus for more times consecutives, or on the contrary
not access for more times, then there isn"t a unit-fault-check on bus, and
the datas could arrive after *a not determinated* time before are avaiable
on slave.
Ethernet, vice versa is more fast than ProfiBus or other FieldBus (I"m not sure that is more fast that LINK2 of Eurotherm Drives), and is more simple to admin than Profibus and is designed specially for high levels of ISO/OSI
"tower": is design to communicate from PLC to SCADAs, to office, administration, delivering ... (don"t lost that first release of Profibus
was called FMS FieldBus Message Specification, and now we talk on release called DP (decentralized periphery) made for low-level osi tower.)
I"d excuse for my very complicate explanation, and errors that I wrote ... but I invite everyone that is interested to write me directly.
Gabriele Corrieri
gabriele.corrieri@tin.it
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Re: Difference between PROFIBUS and Industrial Ethernet
Feb 25, 2002 2:32 pm, by Friedrich Brabandt
For communication between Modicon and Siemens S7-300, i have used the Siemens Communcation-Module CP341 with loadable Modbus-Master Driver.
Siemens is Master, Modicon is Slave. I used this type of