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Control.com topic...

LinuxPLC Project

from the Automation List department...

Looking at LinuxPLC on QNX RTP.

Originally posted by Scott Whitlock on 18 March, 2001 - 9:21 pm

I've actually done what I said I would, and tried compiling the LinuxPLC source on the QNX Real Time Platform (RTP). Not much luck. ...

New Replies:

By Jeon, Hyuk on 9 May, 2002 - 9:38 am -

Thank you for shmem_util.c for QNX. now I wonder where I can find sem_util.c for QNX?...

View entire thread (5 replies) or reply...

from the Automation List department...

Schneider Patent on Device for...

Originally posted by Harald Albrecht on 7 May, 2001 - 5:06 am

I've just come across a short notice in some automation journal mentioning the following patent issue:

New Replies:

By Ras on 7 May, 2002 - 1:22 pm -

Schneider sold the patent to Solaia... and also has immunity....

View entire thread (1 replies) or reply...

from the Automation List department...

Design (long)

Originally posted by Simon Martin on 9 January, 2000 - 6:50 pm

This is a RFC (Request For Comment). I apologize for writing C code, but I think better in code than in any natural language ...

New Replies:

By Jiri Baum on 4 May, 2002 - 11:14 am -

I agree with that. Actually, I've just realised where a big source of misunderstanding might...

View entire thread (25 replies) or reply...

from the None department...

WinPLC hardware platform

Posted by Joe Jansen/ENGR/HQ/KEMET/US on 5 April, 2002 - 5:33 pm

IIRC, there was talk about introducing a strongARM based processor this winter. FWIW, the linked story concerns Sharp releasing a strongARM based PDA with Linux OS...

More on open hardware

Originally posted by Ken Emmons on 14 February, 2002 - 4:41 pm

It sounds like you guys are on your way to roughing a good spec and I am with you on most points...

New Replies:

By Rufus on 25 February, 2002 - 10:17 am -

A minor issue, but I tend to code it as: // if a part passed since last time we reset latch if(...

By Ken E. on 21 February, 2002 - 1:30 pm -

Hello, About latching, we use a 500us scan, using rtlinux periodic thread. On occassion there is...

By Jiri Baum on 21 February, 2002 - 1:23 pm -

Jiri: > > If you have pushbuttons, you need reasonably fast scans for that. > > I'm...

By Gary James on 19 February, 2002 - 9:45 am -

They could be latched & the latches cleared when they get a read strobe.:: -- Gary James ...

By Curt Wuollet on 15 February, 2002 - 12:36 pm -

Hi Kipton Another interesting thing are the I2C ADC's and DAC's. Since ADC in particular will...

By Jiri Baum on 15 February, 2002 - 12:34 pm -

Kipton: > In most (not all but most) cases if an alarm is sounded within 3-5 > seconds of...

By Kipton Moravec on 15 February, 2002 - 12:33 pm -

I agree fully with Curt in keeping it simple. As it stands now you will probably need 3 bus chips...

By Curt Wuollet on 15 February, 2002 - 8:55 am -

Hi Ken "Ken Emmons, Jr." wrote: > > Hello, > > It sounds like you guys are...

View entire thread (8 replies) or reply...

from the Automation List department...

XML (was: Re: LinuxPLC:Hardware)

Originally posted by Jiri Baum on 11 February, 2002 - 1:19 pm

XML would probably be a good idea and not all that difficult to implement...

New Replies:

By Curt Wuollet on 20 February, 2002 - 12:33 pm -

Hi Dave I may very well have my head buried in the snow, not much sand around here. Let's sort...

By David Nimmons on 19 February, 2002 - 5:11 pm -

This conversation is becoming very frustrating! It started when you stated that XML was pure hype...

By Curt Wuollet on 19 February, 2002 - 3:11 pm -

Hi Dave Write what you will. I would be very careful about RPC's in general on control systems....

By David Nimmons on 19 February, 2002 - 10:23 am -

This has nothing to do with Allen Bradley. It is about developing dynamic, interactive, data driven...

By Curt Wuollet on 19 February, 2002 - 9:47 am -

Html? Doesn't require a plug in. Actually that's fine. And there may be no other way to deal with a...

By Curt Wuollet on 15 February, 2002 - 3:57 pm -

Hi Peter I am just counteracting the trend you mention. I agree xML has a place for EDI and...

By David Nimmons on 15 February, 2002 - 1:31 pm -

How about a usage example. I am developing a web based HMI to communicate with Allen Bradley PLC's....

By Peter Wurmsdobler on 15 February, 2002 - 1:30 pm -

Curt, > word processors, exchanging text and it's metadata, XML would be the > tool of...

View entire thread (12 replies) or reply...

from the LinuxPLC department...

"Open" Hardware.

Originally posted by Curt Wuollet on 1 February, 2002 - 4:59 pm

Request for comments on open hardware ideas

New Replies:

By Peter Wurmsdobler on 15 February, 2002 - 12:39 pm -

Curt, > I like the backplane idea rather than stacking IO on the PC104.< Maybe it sounds...

By Curt Wuollet on 14 February, 2002 - 3:49 pm -

johan.bengtsson@pol.se wrote: > Sounds reasonable. > > Power: > What kind of voltage...

By Johan Bengtsson on 14 February, 2002 - 1:20 pm -

Sounds reasonable. Power: What kind of voltage are you suggesting? +5V I suppose. Anything else,...

By Curt Wuollet on 14 February, 2002 - 1:18 pm -

Hi Tom Actually, both. The backplane will have slots for plugun cards like a PLC this lets us...

By Thomas B. O'Hanlan on 14 February, 2002 - 1:16 pm -

The slot selects could be on the /AEN pin for the 104 bus. This would emulate the function of that...

By Thomas B. O'Hanlan on 13 February, 2002 - 2:31 pm -

Look at using a Xilinx or similar PLD to replace multiple 8255s, connected to I/O circuits similar...

By Curt Wuollet on 13 February, 2002 - 2:10 pm -

Hi Johan and all: This kind became a preliminay sketch of the project I've been perusing Maxim's...

By Curt Wuollet on 13 February, 2002 - 2:07 pm -

Oops should be the other 5 bits.:: regards cww _______________________________________________...

By Johan Bengtsson on 13 February, 2002 - 10:55 am -

I don't see that it would add that much complexity really, you need perhaps another one or two...

By Curt Wuollet on 13 February, 2002 - 10:41 am -

Hi Dan Long time no speak. ucsimm is motorola dragonball. gotta go:: regards cww -- Free...

By Curt Wuollet on 13 February, 2002 - 10:38 am -

Hi Johan 8 bit register. 256 slots 8 addresses each 8 bits. Only using 8 physical slots so I could...

By Kipton Moravec on 12 February, 2002 - 3:52 pm -

I just found the uClinux website. It pointed us to the DragonBall Processor. It looks like I can...

By Johan Bengtsson on 12 February, 2002 - 3:42 pm -

Ok, I am not following your math here really.... the slot register, that is something supposed to...

By Curt Wuollet on 12 February, 2002 - 3:41 pm -

Hi Dave I've got it at work, I'm home today working on an automotive hardware problem :^) Later...

By David Nimmons on 12 February, 2002 - 3:39 pm -

No offense taken. I appreciate your patience, because I realized I was not asking my question very...

By Dan L. Pierson on 12 February, 2002 - 3:28 pm -

I suspect that most (all?) StrongArm chips have memory management. The uCLinux effort was aimed at...

By Curt Wuollet on 12 February, 2002 - 3:19 pm -

Hi Johan The count is kinda up in the air right now, I was gonna have 32 points times 8 slots,...

View entire thread (59 replies) or reply...

from the Automation List department...

Open hardware, etc

Originally posted by Ken E. on 12 February, 2002 - 1:21 pm

Could we separate the open hardware discussion and the fieldbus protocol argument?? The open hardware discussion is about plug in boards, not remote IO...

New Replies:

By Karlheinz Schwarz on 13 February, 2002 - 12:21 pm -

Hi All, What is the right notation and encoding schema for process control data exchange? Depends!...

By Curt Wuollet on 13 February, 2002 - 10:43 am -

Hi Mark Yes, the only problem is that it's popular in Germany and other parts of Europe and almost...

By Mark Hutton on 12 February, 2002 - 3:15 pm -

Has any one looked into CANOpen, as an 'open' protocol which already exists?:: ...

By Curt Wuollet on 12 February, 2002 - 3:14 pm -

I'm fine with almost anything where it makes sense :^).:: regards cww -- Free Tools! Machine...

By Harald Albrecht on 12 February, 2002 - 3:12 pm -

<ACK> (or in XML terms: <ACK/>) I do not try to advocate XML here, I still think it's...

By David Nimmons on 12 February, 2002 - 3:10 pm -

I don't think anyone is advocating using XML for internal communications. For communicating with...

View entire thread (6 replies) or reply...

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