ProfiBus
crgwbr
Posts: 614
In the development of a Prop based PLC, I have come across many devices that use the Profibus communication bus. Unfortunately, I haven't found much information that helps with it's implementation on a micro-controller such as the Prop. The Wikipedia article provides a little incite, but not enough to write a driver. If anyone could help, please do.
Thanks,
Craig
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Thanks,
Craig
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My system: 1.6 GHz AMD Turion64 X2, 4GB DDR2, 256MB ATI Radeon Graphics card, 15.4" Widescreen HD Screen
I have a duel boot of Ubuntu Linux and Windows Vista. Vista, because it came with the PC, Ubuntu because I like software that works.
"Failure is not an option -- it comes bundled with Windows."
Use The Best...
Linux for Servers
Mac for Graphics
Palm for Mobility
Windows for Solitaire
Comments
check this link out..
http://www.profichip.com/products/overviewasics/mpi12x/
ProfiBus is fast. the error checking and all that stuff is difficult..
These people make some really cool chips.. people like Festo and many other use them in their equipment.
cheers ron mel oz..
ProfiBus is very compliceted. And can be very fast: up to 12 MBit
It is still in use and will stay for the next 10 Years.
But the follower is ProfiNet. This is TCP-IP with deterministic specifications
on a normal TCP/IP-connection in some cases you have to wait SECONDS for an answer
ProfiNet defines three standards with different garanteed answering-times
i estimate to do this on a propeller is not possible. Even "normal TCP-IP with the propeller uses special chips
But there is a middlecost solution
http://www.anybus.com/products/abc.shtml
has modules for about 350 Euro to connect to a simple RS232
if you do not plan to produce thousands of PLCs i think it would be better
to buy such a module
greetings
Stefan
This is not too complicated and VERY common.
Saluti Joerg
Regards,
Craig
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My system: 1.6 GHz AMD Turion64 X2, 4GB DDR2, 256MB ATI Radeon Graphics card, 15.4" Widescreen HD Screen
I have a duel boot of Ubuntu Linux and Windows Vista. Vista, because it came with the PC, Ubuntu because I like software that works.
"Failure is not an option -- it comes bundled with Windows."
Use The Best...
Linux for Servers
Mac for Graphics
Palm for Mobility
Windows for Solitaire
I have begun writing a MODBUS interpreter (Slave) for my simple OS (EBS08 on my homepage) but it is written in Assembly for
Freescale HC(S)08 MCU's! But i think it is not very difficult to implement a slave interpreter, since normally not all of the commands are used or useful.
Anyhow if you need help let me know.
Saluti Joerg
They are effectively a dual-port ram, with the industrial bus side all taken care of. They use a compactflash connector interface. Once you have that sorted, you can swap in Profibus, Devicenet, Modbus, Lon, even Bluetooth etc
On your side (prop) you can talk to the Anybus module using serial (great for pin count)
Industrial standard means highest possible reliablity.
A device that has to be resetted every week would be thrown out and never used again, because not usable in industrial environments.
I haven't used them but from that I expect if your code is obeying the rules specified in the manual of the anybus-device it will run flawlessly.
keep the questions coming
best regards
Stefan
I agree with dMajo. We've used AnyBus for about 18-months and found them pretty reliable. We've had a couple of failures but we operate them in a offshore environment. The biggest gripe we have with them is they are expensive for what essentially just a protocol converter.