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Control.com topic...

LinuxPLC Project

from the Automation List department...

IO busses/bandwidth

Originally posted by Curt Wuollet on 11 June, 2003 - 11:10 pm

Attempting to resurrect my PC104 PLC project now that the dust has settled a bit.

New Replies:

By Dick Caro on 29 June, 2003 - 1:17 pm -

Spoken like a computer geek. Here is an answer from a control systems geek. There are already...

By Michael Griffin on 29 June, 2003 - 12:29 pm -

On June 26, 2003 21:44, Dick Caro wrote: <clip> > The ideal would be to program all of...

By Hurd, David L \(GECP, MABG, 053698\) on 28 June, 2003 - 12:03 pm -

Dick, Thanks for the voice of reason on the RLL vs computer language argument. I've contended for...

By Higginbotham Ricky \(External\) on 28 June, 2003 - 11:34 am -

Dick: > from the control hardware. These are superior methods to > program complex >...

By Jiri Baum on 28 June, 2003 - 10:09 am -

Dick Caro: > RLL (relay ladder logic) vs. some other programming method for PLCs. > This...

By Jiri Baum on 26 June, 2003 - 10:24 pm -

Andrew Rokicki: > We have substantial amount of libraries written in C++. > The work we...

By Curt Wuollet on 26 June, 2003 - 10:15 pm -

I'm with you on that one, Andrew. But we must also supply ladder logic for our brethren, or be...

By Dick Caro on 26 June, 2003 - 9:45 pm -

RLL (relay ladder logic) vs. some other programming method for PLCs. This is an age-old argument. ...

By Rokicki, Andrew on 25 June, 2003 - 12:43 pm -

We have substantial amount of libraries written in C++. The work we did up front allows us to write...

By Curt Wuollet on 24 June, 2003 - 1:26 pm -

Hi Andrew And good luck with yours as well. I'm still not sure why markets tend towards...

By Rokicki, Andrew on 23 June, 2003 - 7:51 pm -

On June 21, 2003, Curt Wuollet wrote: > It's interesting that you found it cheaper to buy this...

By Jiri Baum on 23 June, 2003 - 7:28 pm -

On June 19, 2003, Andrew Rokicki wrote: > I think we are doing exactly what you are trying to...

By Curt Wuollet on 22 June, 2003 - 8:47 pm -

That is a worthwhile goal, but it doesn't require any talent. Most folks that support multiple IO...

By Curt Wuollet on 21 June, 2003 - 4:26 pm -

Hi Michael I'll answer from what's in front of me right now. I'm doing scehmatics in Xcircuit...

By Curt Wuollet on 21 June, 2003 - 4:24 pm -

How many factories don't already have an ample collection of unlisted assemblies and stuff they've...

By Curt Wuollet on 21 June, 2003 - 4:23 pm -

Hi Andy It's interesting that you found it cheaper to buy this stuff, even in the long run. Of...

By Curt Wuollet on 21 June, 2003 - 7:44 am -

I've been assuming that both busses were usable simultaniously. It's not a tragedy if this isn't...

By Michael Griffin on 21 June, 2003 - 12:51 am -

On June 19, 2003, Bob Peterson wrote: <clip> > Just out of curiosity - how many people...

By Michael Griffin on 19 June, 2003 - 4:56 pm -

On June 17, 2003, Curt Wuollet wrote: <clip> > > The main > > requirement...

By Rokicki, Andrew on 19 June, 2003 - 4:18 pm -

Curt, I think we are doing exactly what you are trying to do. Except executable is not MAT PLC...

By Bob Peterson on 19 June, 2003 - 4:18 pm -

Just out of curiosity - how many people are willing to accept the basically unlimited liability of...

By Alex Pavloff on 19 June, 2003 - 4:13 pm -

The PC104 Consortium's specs for PC/104 and PC/104-Plus are available at PC104.org. PC/104-Plus...

By Curt Wuollet on 17 June, 2003 - 4:43 pm -

Hi Dick Yes. I'm going to adapt PC104 ISA slightly as an IO bus and use PC104+ PCI for...

By Curt Wuollet on 17 June, 2003 - 4:41 pm -

Hi Michael On June 14, 2003, Michael Griffin wrote: > On June 12, 2003 00:07, Curt Wuollet...

By Curt Wuollet on 17 June, 2003 - 4:27 pm -

Hi Andrew Yes, I have used the computerboards stuff as well. In fact I designed a translator...

By Michael Griffin on 17 June, 2003 - 3:56 pm -

To clarify this further for anyone who may be interested, I believe that PC/104 uses the ISA bus,...

By Dick Caro on 17 June, 2003 - 3:54 pm -

Curt, I am sure you know that PC104+ uses the PCI bus rather than the ISA bus. This is a great...

By Michael Griffin on 14 June, 2003 - 12:55 pm -

On June 12, 2003 00:07, Curt Wuollet wrote: <clip> > Attempting to resurrect my PC104...

By Rokicki, Andrew on 14 June, 2003 - 10:46 am -

Companies such as computerboards: http://www.computerboards.com/cbicatalog/directory.asp?dept_id=8...

View entire thread (32 replies) or reply...

from the Automation List department...

Re: contracts and software licenses (was Linux in the field)

Posted by Jiri Baum on 24 June, 2003 - 5:16 pm

Empty summary

Read more or reply...

from the Automation List department...

High Resolution Timer for Linux

Originally posted by Nader Ghasemi on 17 September, 2001 - 10:06 am

What I need is a very exact timing mechanism in Linux. ...

New Replies:

By Anonymous on 24 June, 2003 - 1:04 pm -

just go here! http://www.ittc.ku.edu/kurt/documents-noframes.html...

View entire thread (7 replies) or reply...

from the Automation List department...

Linux friendly PLC?

Originally posted by Gaurav Jain on 25 July, 2001 - 4:08 pm

I am a graduate student-lurker in this list. I am working on a college lab automation project, where I need to control some processes using a PLC, and web-enable them...

New Replies:

By nobin on 12 March, 2003 - 4:12 pm -

Hello, Protocol converters are available for industrial networking, so one need not stick to...

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

from the Automation List department...

Regarding Modbus

Originally posted by Aditya Ayachit on 30 October, 2001 - 12:55 pm

I have a few questions regarding MODBUS...

New Replies:

By Jeff Cobb on 10 March, 2003 - 10:23 am -

> Another fundamental question that is troubling >me is why use ASCII protocol when : >...

By Mike McCafferty on 25 November, 2002 - 5:26 pm -

The ASCII version of Modbus is mainly for keyboard entry using a terminal program. It allows 1...

View entire thread (7 replies) or reply...

from the Automation List department...

Ladder Logic on Linux

Originally posted by Kipton Moravec on 6 November, 2001 - 5:23 pm

Is there a ladder logic programming environment for Linux.

New Replies:

By Andrew Laughton on 2 October, 2002 - 6:35 pm -

There are at least 2 that I know of. Still in alpha code at the moment. Try...

View entire thread (2 replies) or reply...

from the chemical engg department...

PLC & DCS help

Originally posted by jawad on 9 September, 2002 - 3:33 pm

I have an assignment to carry out regarding the Introduction, principles, working, advancements, capabilities, and operational nature of the Programmable Logic Control (PLC) and a Distributed Control System (DCS)...

New Replies:

By S. Albright on 10 September, 2002 - 12:26 pm -

I will help you where I can. I work in the Advanced Controls division of a multinational utility....

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

from the Automation List department...

Ladder Logic Reference

Originally posted by Kipton Moravec on 15 May, 2001 - 10:34 am

I am looking at developing a ladder logic interpreter/compiler.

New Replies:

By G.Luca Furno on 26 August, 2002 - 11:21 am -

We develop LADDER compilers for embedded system ...

View entire thread (3 replies) or reply...

from the Is QNX Linux? department...

Embedded Linux variant in Omron's "Open Network Controller"

Originally posted by Dale Malony on 1 June, 2001 - 6:25 pm

Omron Open Network Controller runs on QNX which sounds like a tweaked Linux, and comes in a diskless PC package with a "Soft Logic Controller." Is QNX Linux. Is it good? Is this something that could help the LPLC project? I might buy it for Honda as a gatway between RSView and my Proprietary Omron Networ, Sysmac Link.

New Replies:

By Michel Morisset on 25 August, 2002 - 9:53 pm -

You can use the software from "www.altersys.com":http://www.altersys.com . The ISaGRAF...

View entire thread (2 replies) or reply...

from the Automation List department...

Ethernet DIO, was DIO Boards

Originally posted by Ken Crater on 27 March, 2000 - 1:38 pm

This message is being forwarded from Stephen Mason [stephenm@jescousa].

> I am new to this group so forgive my ignorance. I thought the whole issue about using Ethernet for control was the fact that Ethernet is not
deterministic and is susceptible to data collisions. Am I wrong about this?...

New Replies:

By Anonymous on 6 August, 2002 - 4:20 pm -

Just a few comments to Curt's response... 1) "My "deterministic" Devicenet can't...

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

from the Automation List department...

RS232 - RS485 converters

Originally posted by Mario de Sousa on 19 October, 2001 - 1:03 pm

Here goes one more question: I am using an RS232-RS485/422 converter that relies on the RTS line of the RS232 side to control the high impedance state of the line drivers on the RS485/422 side. ...

New Replies:

By Ron Smith on 14 July, 2002 - 10:24 pm -

Hi Mario, Please check out "www.rs485.com":http://www.rs485.com or...

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

from the Automation List department...

Problems interfacing through parallel port

Posted by Gert Love on 10 July, 2002 - 6:26 am

Apparently Windows forces some bits in the parport registers high or low. Is there anything to do about it?

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