Experimental Physics and
Industrial Control System
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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Advice on VME processor cards for EPICS |
| From: | Noboru Yamamoto <[email protected]> |
| To: | "TYLER, Paul" <[email protected]> |
| Cc: | "EPICS (E-mail)" <[email protected]>, [email protected] |
| Date: | Thu, 07 Nov 2002 10:51:03 +0900 |
TYLER, Paul wrote:
Hi.
I've been lurking for a while and reading up on EPICS but think it is time for a question. We have been using a home grown control system for our Tandem accelerator that has never really met user's expectations. I've been looking at various options to upgrade or redo our control system and believe EPICS is a good choice for us. Currently we have VME based hardware with MVME147 processor cards. I think it is a lost cause trying to utilise the MVME147s and for the cost of a VxWorks licences for them, we can upgrade our cards and use a free O.S.
So I'm wondering if anyone has any suggestions on CPU cards for (old) VME crates that might be suitable for EPICS? We are trying hard to avoid VxWorks due to the expense. So that leaves us with RTEMS or even just running IOCs under Linux. Our current response times are measured in seconds so while Linux isn't a "Real Time" OS and has some latency issues, it may well be quite ok. (Any comments about that are welcome.) We don't need huge processing power either. (We just cope with the MVME147s.)
So my major question and then a minor one. Any suggestions on replacement VME processor cards with Operating System options? Price is a consideration. We also have a preference for cards that can run Linux and RTEMS. Also is anyone running with Pentium based systems?
If you have any other comments, they would also be welcome.
Thanks in advance.
Paul Tyler
Bob Dalesio wrote:
If performance and latency are not issues, you may choose to use linux on a PC. Version 3.14 can run both the I/O interfaces and the operator software in the same box.
I suppose the real cost would be in replacing the I/O. If you have VME I/O, then Till's suggestion to use RTEMS seems the best approach.
Bob
In the one of test bench system, we use Intel CPU VME board running EPICS on Linux. As Bob pointed out, if performance and latency are not issues, this configuratin can be another candidate.
Intel based VME CPU board may cost more than a conventional PC, but can use VME interface board you have. We picked up a VME bus driver Linux from the Net. We uses this driver with EPICS CAMAC support for Hytec
CAMAC serial driver. Odagiri-san(jun-ich.odagiri at kek.jp) knows URL and other information on this VME driver for Linux.
Regards,
Noboru Yamamoto EPICS group/KEKB control group KEK, JAPAN
- References:
- Advice on VME processor cards for EPICS TYLER, Paul
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