Flex727

I don't see a good reason for using floating point in your application. Just use integer with implied decimal. You can display an integer on screen with the correct number of decimal places. Just do integer math, keep track of where the decimal goes, multiply or divide by 10 (or 100, etc) as needed, and display it accordingly.

Good for you, @Cara Bereck Levy! Where did you go?

That's why I use this forum. I learn something new every day. Thank you, @Gabriel Franco!

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Did you try "Resume" from the Chrome download bar at the bottom of the screen?

The application software was lost. Is the battery good? Check the battery and the power supply, then reload the application from VisiLogic or an SD card. To prevent this, do "Download All & Burn" when downloading the application.

The V350 is programmed in the same identical way as all the Unitronics Vision PLCs (model numbers start with V). There are also example programs that come with your VisiLogic installation. Take a look at those. There are also a number of YouTube training videos. Give those a watch. If you have specific questions after making attempts on your own, come back here and ask. You are welcome to post any code you've developed and ask specific questions about it that you may have.

Yep, this is a good tip.

Yes, you should be able to do that with the proper setup of the routers. If the routers can communicate, then the PLCs should be able to also.

As a programmer, I spend a lot of time downloading a program to a PLC that was previously used for something else. There are many, many prompts that I must wade through to get the program downloaded, most with no audible notification. Can we please provide a "Yes To All" prompt at the beginning so that we can initiate a download and walk away for the lengthy download process?

Good point, @Ausman.

Yes, you should be able to do what you're suggesting. I'm not sure what happens when you try 2 simultaneous connections between 2 PCs and 1 V1040 PLC on different ports, but it should work. Regardless, you can connect all 12 PCs and the 6 V1040s to a large hub, assign different IP addresses to each PLC & PC (all on same subnet), then any PC can connect to any PLC by selecting the PLC in the drop-down box in the VisiLogic communications setting.

In this context, the subnet is the first three triads of the IP address. For example, your PC may have the IP address 192.168.1.7. The subnet is 192.168.1.xxx. The PLC should have the first 3 numbers the same and the last number different from anything on that same subnet. The PLC could be set to 192.168.1.8. A simple internet search should provide the answer to how you determine the LAN IP address of your PC. The easiest way, I think, is to bring up a command prompt and enter the command, IPCONFIG. You want the IPv4 Address.

Yes, go into INFO Mode and obtain (or set) the IP address of the PLC. Also note the PLC Name. Make sure your computer you are trying to connect with is on the same subnet as the PLC IP address, then use a crossover ethernet cable to connect. Do you need to know how to enter the needed details into VisiLogic?

In my 10 years of experience with Unitronics I've had something similar happen exactly once, except that they were all set to zero. Apparently there was a power surge at the plant and that is the likely cause. I call it a fluke and I don't worry about it.

Ah, cool. Thank God for VisiLogic.

Are we talking about Data Tables? I've never seen Data Tables at all in U90 Ladder.

Glad you mentioned that Ausman. I was going to ask, and forgot, if the coil was always on or if he actually saw it turn on. I've been surprised on occasion at what coils are already set when I load software. It's usually a good idea to load a blank project and perform initialize & reset, prior to loading a new project in a PLC - even a brand-new PLC fresh from the factory.

Obviously there isn't enough information here to answer your question, but here is the approach I would take: - Search for MB 7 to see if it exists anywhere else in the program (other than the Reset in rung 4). If not, then: - While online (as you are above), try to turn off the bit. If it will turn off, then look at the logic in Rung 2 that turns on MB 3. If anything can turn on MB 3, even if only for 1 PLC cycle (which you would not be able to see while online), then MB 7 will be Set. - If neither of the above solves the problem, then now that you have MB 7 off, do some testing to see if you can get it to turn on again and note the conditions present. By the way, it is good programming practice to label every operand used in the program. Also, NEVER have a timer contact following the timer coil, as you are doing (twice) in Rung 4. It makes no logical sense and will not function properly. While not prohibited, it is usually poor practice to have ANY contacts following a coil (most PLC programming software won't allow it at all even though Unitronics does). Break the logic up into multiple rungs to avoid that. Think of a ladder rung as "conditions >>> actions". Keep all the conditions (contacts, compares, etc) to the left and actions to the right (coils, stores, etc).

Well, it would depend on exactly what you're trying to do.

There are many ways to do this. One way is to create a 1 hour timer and use it to increment an MI or Counter.

Nicely said, @Ausman! Forum members - this is terrific advice.

SI 0 provides the scan time for the PLC.

Even if only 2 pulses per second, what is the length of each pulse? Couldn't it still be missed unless a HSC is used?