Welcome to Control.com, the global online community of automation professionals.
Control.com - Nerds in Control
Member Login
Search
Jump to a Date
Sponsored Communities
Cool stuff
Twitter Feed
Neat Stuff
Visit our shop for nerds in control lifestyle products.
Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
"I went to the museum where they had all the heads and arms from the
statues that are in all the other museums."
-- Steven Wright
statues that are in all the other museums."
-- Steven Wright
RSS Feed
Use this link to get an RSS feed of the Control.com article flow, for private, non-commercial use only:www.control.com/rss/
To get a personalized feed, become a member at no cost.
Could anybody please confirm/deny that the maximum frame size for modbus rtu is: 6 (header) + 250 (data) + 2 (crc) bytes...
New Replies:
By Mario de Sousa on 24 October, 2001 - 12:58 pm -
The preemptable patch should be removing those long locks, so we shouldn't have a problem there. ...
By Greg Goodman on 24 October, 2001 - 12:58 pm -
> Greg, I believe you support Modbus on the PuffinSCADA? Can you give us > an idea of how...
By Silbaugh, Randy D. on 24 October, 2001 - 12:57 pm -
Mario wrote: >>> But the question remains: can we be sure that in the future there won't...
By Greg Goodman on 23 October, 2001 - 3:27 pm -
> correct limit to function 16 is 100 registers (giving a message of 207 + 2CRC bytes) and not...
By Wayne Johnston on 23 October, 2001 - 10:23 am -
I think everyone who ever implemented Modbus has come up with the same question. My interpretation...
By Gilles Allard on 22 October, 2001 - 11:52 am -
Receiving a Modbus RTU message is not easier. The inter-character timer is not implemented in...
By Curt Wuollet on 20 October, 2001 - 9:36 am -
Hi Mario. I'm just curious if the preemptable kernal patch would let us do this except for the...
By Jiri Baum on 18 October, 2001 - 5:07 pm -
> Jiri Baum wrote: > > Judging just by that, I'd expect that gaps of between 1.5 and 3.5...
By Mario de Sousa on 18 October, 2001 - 4:47 pm -
Jiri Baum wrote: > Judging just by that, I'd expect that gaps of between 1.5 and 3.5 chars may...
By Mario de Sousa on 18 October, 2001 - 4:32 pm -
Mario de Sousa wrote: > Well, I have had a chance to read it more carefully, and it is not so...
By Jiri Baum on 18 October, 2001 - 4:31 pm -
Mario (quoting a spec): > Right, here it is: > "The entire message frame must be...
By Mario de Sousa on 18 October, 2001 - 3:39 pm -
Arghhh!!!... I have just found a few minutes to calmly re-read my message, and found that it is...
By Mario de Sousa on 18 October, 2001 - 2:48 pm -
Greg Goodman wrote: > > Section 5.1 of the Modicon spec >...
By Greg Goodman on 18 October, 2001 - 2:34 pm -
> Could anybody please confirm/deny that the maximum frame size for > modbus rtu is: 6...
A lot of people believe that what I am talking about is just the ability to display in various languages. So I have changed the name to TROWSERS which stands for translating browsers...
New Replies:
By Mark Hutton on 23 October, 2001 - 12:22 pm -
It is even worse because in most cases you are talking about technical translation. There are also...
By Jiri Baum on 21 October, 2001 - 10:47 am -
Anand: > What I mean is not just key mapping or making characters available on > display, but...
Some spam just arrived from Altersys indicating that all ISAGRAF products are now available on Linux supporting RTAI.
I've worked again a bit on auto* support in linuxplc. Those curious about this topic can mail me for a copy of the files. Anyway, I have some issues ...
New Replies:
By hopfgartner on 23 October, 2001 - 10:30 am -
On Tue, 23 Oct 2001 13:09:18 +0100 Mario de Sousa <msousa@fe.up.pt> wrote: > hopfgartner...
By Mario de Sousa on 23 October, 2001 - 9:36 am -
Peter, The code under /logic/iec /logic/plc5 is incomplete, and does not compile...
This is surely one for Curt: From the preface of the OPC Foundation's specifications ....
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 Thomas B. O'Hanlan on 22 October, 2001 - 3:41 pm -
Commercial Break: Please check out Sealevel Systems' line of converters @ www.sealevel.com. Like...
By Mario de Sousa on 19 October, 2001 - 2:29 pm -
Andrew Kohlsmith wrote: > > > Is this common in RS232-RS485 converters? If true, then we...
By Andrew Kohlsmith on 19 October, 2001 - 1:08 pm -
> Is this common in RS232-RS485 converters? If true, then we have to take > this into...
It's not that I'm shying away from writing a device driver (it would not be my first...), but I would guess that most users would prefer to
have it implemented on a user process, rather than having to mess around with installing device drivers...
have it implemented on a user process, rather than having to mess around with installing device drivers...
Curt Wuollet wrote:
> No Modbus doesn't require special hardware, but does have
> some interesting requirements.
When I was in Bracknell (UK) earlier this year I saw a Modbus emulator program that runs under NT via the serial port. The only special hardware requirements is the RS-232 to the "flavour of the month" serial protocol (RS-422/485) ...
> No Modbus doesn't require special hardware, but does have
> some interesting requirements.
When I was in Bracknell (UK) earlier this year I saw a Modbus emulator program that runs under NT via the serial port. The only special hardware requirements is the RS-232 to the "flavour of the month" serial protocol (RS-422/485) ...
New Replies:
By Gilles Allard on 21 October, 2001 - 12:00 pm -
Receiving a Modbus RTU message is not easier. The inter-character timer is not implemented in...
I have been thinking of making the tiny browser SCADA put up at www.smbd.org multilingual ...
New Replies:
By Gilles Allard on 21 October, 2001 - 11:49 am -
Anand a ecrit: >I believe that having a new tags in HTML will greatly help in having...
By Paul H. Gusciora on 19 October, 2001 - 2:58 pm -
It might be easier to get everyone to convert to Esparanto. But seriously, there are more basic...
I am currently working on getting the modbus module back up, but need some help.
New Replies:
By Wayne Johnston on 18 October, 2001 - 2:39 pm -
The short answer: 0 The long answer: The address in the command sent is the offset of the register...
By Randy Silbaugh on 17 October, 2001 - 2:11 pm -
addressing: The first address is 0x00 in Modbus RTU. Unfortunately in the Modicon world the first...
By Kelvin Proctor on 16 October, 2001 - 8:48 am -
Mario, I sould suggest that you should should write 0 onto the wire. There is a bit of ambiguity...
Once such a protocoll is established, all suppliers, system integrators or other control entities can use it, suggest add-ons, etc. It would be open...
New Replies:
By Scott Cornwall on 15 October, 2001 - 3:06 pm -
I think you are confusing the OPC XML spec with the upcoming OPC DX spec. In a lot of respects I...
By Peter Wurmsdobler on 15 October, 2001 - 2:51 pm -
Scott, From what I understand, the new standard is a xml wrapper, but underneath you have still...
By Harald Albrecht on 15 October, 2001 - 2:30 pm -
Hi Robert, (come to terms with Interkama, eh?!) Robert Schwebel wrote: > On Thu, 11 Oct...
By Scott Cornwall on 15 October, 2001 - 2:28 pm -
It could be worth looking into the upcoming extension to the OPC standards - OPC DX. Although there...
By Robert Schwebel on 15 October, 2001 - 2:13 pm -
On Thu, 11 Oct 2001, Peter Wurmsdobler wrote: > The message is: Would it be possible to...
By hopfgartner on 15 October, 2001 - 2:03 pm -
Compliments, this site has links to very informative places. I think it should be linked from...
By Curt Wuollet on 15 October, 2001 - 2:02 pm -
Excellent! I hope we can promote more cooperation. Regards cww -- Free Tools! Machine...
By Peter Wurmsdobler on 15 October, 2001 - 2:02 pm -
Jiri, > Please, do not have two protocols with the names OPC and OCP. That'd be > just too...
By Robert Schwebel on 15 October, 2001 - 1:52 pm -
Hello Curt, On Mon, 8 Oct 2001, Curt Wuollet wrote: > It would be great if there was a site...
By Rick Jafrate on 15 October, 2001 - 1:43 pm -
When I checked out APCLT there were links to other goings on at AACHEN. All of them very...
By Harald Albrecht on 15 October, 2001 - 1:39 pm -
Curt Wuollet wrote: > But how would I know about the other projects? <smart-ass>You...
By Paul Jager on 15 October, 2001 - 1:24 pm -
> I've looked at VisiPro and AutomationX For automationX it was a lot of work to convert the...
By RufusVS on 15 October, 2001 - 1:22 pm -
Curt, You *have* heard about translation filters on the 'net, like...
By Jiri Baum on 15 October, 2001 - 1:21 pm -
Peter: > Could your protocoll be some basis or even THE open control process > protocoll,...
Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2009 Nerds in Control, LLC. All rights reserved.
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Patronize our advertisers!