Thanks for the reply. I actually received this patch from Rockwell/Reliance tech support late last week. I tried it today and it eliminated the timeouts, although I didn't try uploading any programs. I am working with a test rack, and all my programs are small, so I'm not sure I could even...
Thanks, I hadn't thought to try that. While it didn't help the CPU utilization at all, it did reduce the communication timeouts we were seeing. The communication timeouts are new since April, don't know if it's the result of a new program installation, Windows Automatic Updates, or some other...
If it's a hazardous material it should be listed on a flamability classification chart. I use to have a nice one, I think it was MTL Instruments that published it. In fact I think it may have been a PDF you could get from their website. My work with hazardous areas was primarily for solvents...
Is anyone still Reliance AutoMax? We have v4.3A of the Executive on a WinXP laptop and we are having issues with the Online Task Manager (basically a DOS app compiled for W2K/WXP). When going online (RS232) with the Online Task Manager, it grabs all available CPU time. This makes our laptop...
Jeffersonian,
My experience is similar to yours. We've always done a separate reset button.
NFPA 79 says this:
10.7.3 Restoration of Normal Function After Emergency Stop.
It shall not be possible to restore an emergency stop circuit until the emergency stop device has been manually reset...
Thanks again to all for the feedback.
We have checked grounds. We have a separate "TE" ground for all electronics which is separated from the "PE" ground on the high voltage. All cabinets with PLCs also have drives with IGBT output stages. We've done the best we can to...
All good ideas. Going to back to v11.11 is an option, but the rest of the plant is on v12, so that would be met with resistance.
As for checking the faults, the processor is D-E-A-D dead. No comm of any type (not Ethernet, ControlNet, bridging, DF1 - zippo).
Here's an update. AB sent a...
Anybody seen anything like this before?
We have a fairly good sized AB ControlLogix (1756) installation using 5 ControlLogix chassis containing L55 and L63 processors using Logix5000 v12. We have a peer-to-peer ControlNet network, Separate ControlNet for Remote I/O, as well as a common...
Sorry, I think you're looking at line-by-line.
I can't recall if the 484 had the network-vs-rung structure, but if it does, keep in mind that the 7x11 network solves vertically first (solves the first column, then the second column, etc.), regardless of rung structure. This can really kick...
Don't forget about Reliance AutoMax! Oh wait, that's been discontinued. They did have the first PLC with FB that I ever saw, dating back into the 80's.
Keep in mind that even if all your selections are IEC 61131-3 compliant, they won't necessarily program the same. Implementations can vary...
I suspect I am. The problem is, there appears to be sufficient rope in the NEC to hang myself and the others involved in approving this design, should an accident ever occur. Lawyers just love vague descriptions that they can warp to their liking. That's why we need printed literature.
The...
RAMConsult,
Thanks for the additional doc, it does an excellent job of describing Intrinsically Safe installations. While it does mention Nonincendive installations, it still does not discuss how to design a proper Nonincendive installation. It references other documents (Vendor Control...
japott,
One of my contacts told me to get a hold of FM document #3611, which is supposed to cover Nonincendive installations. You can see a complete list of FM docs at:
http://www.fmglobal.com/research_standard_testing/product_certification/approval_standards.html
There's an 800 (877...
I read the abstract for ANSI 12.12.01-2000. It appears to be details on designing components/equipment which will be certified for Class 1, Division 2. It doesn't say it covers installing these devices in a system.
As for the NEC, it sure reads like a legal document. I understand there's a...
Good question. I'm struggling with this as well. The 2002 NEC has an added definition for Nonincendive Field Wiring and related code, but it's only added confusion to the issue. I can't say that my interpretation is valid as it's very unclear and poorly worded. I'm sure it makes perfect...
