redeemer

This kind of logic is normally used for starting and stopping a motor. The logic is that when pressing the start button, the output will be activated (M10), this in-turn will be used to keep the command even after releasing the start button (the second branch starting with contact M10). Pressing Stop will de-energize M10. Error signals were used to stop this "latching" action, the logic in my guess is that if there's an error feedback from the motor, the output will not be kept active as long as the proper feedback was not received.

I'm not sure if this helps, but I found this article interesting: http://www.bin95.com/safety_relays.htm I think, the most important question is what will the circuit do in case of fault of elements.

Thank you for your response. I was considering physical routing. And I have considered using regular AutoCAD (not Inventor) to make 3d drawings. But what I'm not sure of is the level of details I should (or could) put in each type of diagram. I have considered for example to make isometric diagrams. These would be very good to specify the lengths of each segment of the cable route. But it might not be very helpful to specify where the route will go and how they fit with their surrounding environment (other machines, support for the trays, etc...). On the other hand: details 3d drawing, are not only processing power intensive, they are difficult to output to paper in a clear and understandable manner. One of the reasons I posted the question here, is to see if I can find sample cable tray construction documentation so I can produce similar documents. In particular, if there are any special conventions that can be used in such diagrams. I tried to search online, but I mainly found proprietary solutions for plant piping and cabling in 3D. Anyway, thanks again, Fadi

Hi, I'm currently in a situation, where I need to specify how cable trays should be installed/routed. I'm not sure of any conventions or standard diagrams that are used for this purpose. Can anybody direct me to any design software or sample diagrams that I can use as a guideline to follow? Regards, Fadi

We haven't talked with a manufacturer yet, we are still in the planning phase. And we were looking into the things that should be taken into account. And it's an opportunity to learn. In your response you mentioned using a non-shielded cable. What's the point? I feel I'm missing something here.

This is very interesting. I tried to find this information on ww.ab.com, but couldn't. Do you have a link or a keyword, I would be grateful. Fadi

Hi, I have an application where I use a frequency inverter to drive a 7.5hp motor located 250 meters away from the drive. Speed changes are not very rapid (in the order of one minute). When choosing the drive and cable, are there any special requirements due to the long distance between motor and drive? Or is it enough to choose a drive with a compatible power rating and a suitable cable according to the max current? Electro-magnetic emissions are not an issue in this application. Regards, Fadi

Thank you for your response. Luckily the problem was resolved. I'm not very sure what was the real solution (or the problem!). But after several attempts at rebooting the device, re-programing, OS-update, finally the device accepted (all by itself!) an OS update and the program was gone and it was accepting re-programming again. Currently I'm not very keen on trying to re-create the problem to check what was the real cause. I have now reasons to doubt that it was not the device's problem but a USB-to-serial connection fault. But I'm not very sure and willing to find out. Thank you again for your answer, Fadi

Hi, I have an OP73micro panel that I'm configuring. In the settings I changed the time the panel waits for a program transfer on startup to 0. The panel now starts directly into it's program, and I'm not able to re-program it. Does anyone know how to do a reset? Or how to cause it to enter programming mode again? Regards

Hi, This might sound odd: Can somebody tell me where I can find resources about how to draw electrical schematics according to the IEC standard? What I'm looking for is something to define the valid kinds of schematics, and the semantics of schematic elements and how they should (or shouldn't) be used. Regards, Fadi

Yes you can. I'm not sure what's the trouble you're having, but for me, I do it this way. The recipe name is only for the user to see, and is managed and used by the HMI. So I only reserve a proper place for storing it on the PLC, but I don't need to reference it from the PLC itself. For example, on the HMI, I add a text input field and put the address for example VB200, and use 20 for the field size. On the PLC I declare a dummy variable RecipeName on address VB200. And declare another one RecipeNameEnd on address VB219 so I don't accidentally put anything in the reserved area for the recipe name. And it works! Regards, Fadi

Hi, I was just browsing my old topics and came across this. It seems that I have stopped the conversation, I must have been pretty busy at that time. What happened is that we delivered the application. After contacting a local supplier we followed his advice in using a servo motor (From SEM, UK) with a position control drive (from QUIN, UK). Quin helped us with an skeleton for a flying shear application using (in their lingo) the soft-cam functionality of their drive. The application was successful, it has been running for about three years now.

Thanks again, Currently we provide the following: A user's guide: it includes general operation and any error messages and configuration options. A binder with the diagrams, these are electrical, panel layout and terminal block diagrams. Any special equipment documents. Internaly, we keep the original programs and some design documents, but these does not have any standard format (PLC program files, some spread-sheets, and the like), I was trying to figure out a set of documents+formats that we can stick to. Just an idea!

Thank you motion guru for this summary. But if I may ask, this binder of yours, what are it's main sections. Are there any overview block diagrams of the system? Architectural plans for the factory floor and where elements are installed, a glossary of terms used.... etc? In my original question I was asking about the different document types that could (or should) be included in a project documentation and where do they figure in the lifetime of the project. Anyway, thank you again. Cheers

Mainly for design and documentation. I checked the URL, this one is for Structured Flow Charts, what I'm looking for was Sequential Function Charts. The other link, though is better, but the software doesn't seem to be available. Thank you anyway.