Flex727

And to just expand on what Ausman is saying. The actual physical output from the PLC is not altered until the complete ladder routine has finished executing. It is only the final state of the digital output coil that will be sent to the output module on each PLC scan. Also keep in mind that ladder code is not like other computer code. A direct coil that is not explicitly turned on is explicitly turned off. Understanding that last sentence is critical to understanding the difference between ladder logic and regular computer programming.

Do you have 24 VDC connected to the Snap-In module? Do you have the jumpers set properly? Do you have it wired like this:

Yes, if the button goes away, you can't unpress (release) it! If you insist on hiding the button when pressed, then reset the coil in ladder logic. I don't see "N2_HMI_READY" in your post, so I don't know.

You're conflating coils and contacts. A coil is what you use to change the status of a binary memory bit (0 or 1), a contact is what you use to perform an action based on the status of that bit. (apologies if you already know this but your comment indicated to me that you might be confused on this point) "Setting" a coil is the same as latching it. It will stay on until it is unlatched (Reset). A positive transition contact will pass logic power flow for one PLC cycle when the the coil is energized (whether by direct or latching). That positive transition contact will not ever pass logic power again unless the coil turns off then on again. It absolutely does (if you coded the button correctly), but with a direct contact instead of a positive transition contact, it can execute many times (maybe hundreds of times) before the reset occurs because of the time it takes to remove your finger from the button. No, absolutely not. Yes, correct. I don't know what you're asking here.

You MUST use a positive transition contact for "HMI_START_N2_PURGE".

Looking forward to it!

I'm not sure I understand exactly what you're trying to do, but if you want to alternate engines every 2 hours of operation, I would assign a coil to determine currently active engine (0=Engine 1, 1=Engine 2), then toggle the coil triggered by your accumulating register. Place the inverted contact for that coil in series with MB0 and direct contact in series with MB1.

I love that!

@Ausman's cleverness never ceases to amaze me!

I think that's why they added that feature to the UniStream product line.

Yes, re-wire that speaker to a computer. In all seriousness, I sincerely doubt it, but I eagerly await the response from someone who actually knows something.

It says V120, not V1210 in that help entry you're referencing. I think the V120 is an older Vision model, not Enhanced Vision. Have you tried it to see if perhaps it outputs the PWM in units of 1 Hz instead of 0.1 Hz? @Cara Bereck Levy, does the Help file need to be updated for this function?

One way is to store the RTC as strings in a couple of MI vectors. You can then copy those into a data table or simply display them on the screen, triggered by the reset button.

I didn't notice that. Great spot!

I moved this to the appropriate forum. The message is telling you that the PLC is stopped. Normal mode is Run mode. If reboot (power cycle) doesn't help, go into INFO mode to see if you can change the mode to Run. Do you know that there is a program in the PLC? You may need to check or replace the battery and re-load the program.

Okay, I looked it up on the internet and was able to get to the setup page. Here is a screen cap: I don't recall having to do anything special - just place it in Bridge mode. I turned off all security to avoid that complication.

I purchased, set them up, and tested them a couple of years ago for a project that never came to fruition. I don't even remember how to get into the setup. If you can remind me of that, I'll try to get in and screenshot the setup page and post it.

That's the first time I've ever seen that statement made. Usually it's the other way around.

Yes, I have the exact model shown in the photo in the OP and have successfully used them to connect (via MODBUS TCP) PLC-to-PLC and PLC-to-router/modem to the internet.

This is telling you to update the firmware on your PLC. To do that, insert a USB thumb drive that is formatted to FAT32 in your PC and let UniLogic download the new firmware to it. When it is downloaded, insert the USB drive into the PLC and perform the update. When that is complete you will be able to download your project.

I have a pair of these and they work flawlessly with V570s. As hotwires says, connecting to ethernet doesn't require any kind of driver therefore it should work with any ethernet enabled device.

Translation: "Hello, I have the same problem with Unistream HMI screen and gives me error, someone has the solution to the issue? regards" Please post your problem description in the UniStream forum as a new topic.

Here's a very simple example. I generally add a bit more complexity when I want to give the user the ability to adjust the screen brightness to suit the environment. You also need to be careful because any screen elements with a touch property can still be activated when the screen is touched while backlight is at zero.

Yes, SI 9 controls the screen brightness. Just create a timer that will trigger when there is no screen touch (SB 16). Then use SB 16 to restore SI 9 to the previous value.

Try removing it and snapping it back on just to make sure.