Flex727

Serial No. is on the right-hand side (facing the screen), just above the Ethernet port.

The help file has 4 tabs: Contents, Index, Search, and Favorites. Click on the Search tab and type in the search term you're looking for. If you don't see the tabs, then look along the left side of the help window for a line you can drag to the right. The tree window that shows all the contents of the help file sometimes gets compressed to the left.

Yes, just have a timer and if the Acknowledgements doesn't increment within a reasonable time then initiate your refresh routine.

After a thorough review of the software and other communications settings, as you have done, I would certainly try swapping out the PLC as the next step. Make a clone file on an SD card to install on the replacement PLC so that you know you have the exact same settings. If it fails again you know that it's probably not the hardware. If you don't have a spare PLC (with 180 of them I would think you would have several), then just swap two that are in service to see if the problem moves with the software or hardware, once again using SD clone to swap the software. Another option is to include the "refresh" routine in software to happen automatically.

Don't try to use the basic button or String Library for this application. Just use the ASCII String function, both to enter the string and to display it. When you display it, add the touch property and make it Style: "Unpressed" so it will look like a button. Also, you probably don't need to have an entry for "Legal Entry" unless you need to know that the string has changed for other logical purposes. Use the same MI vector in both places and eliminate that ladder rung 2 above. Be sure you understand that a 17 character string will use a vector of 9 MIs (MI 4 - MI 12).

There are example projects that came with your VisiLogic installation - Just click Help/Examples on the top menu.

Not an answer to your question, but why are you using a RS232 to RS485 converter? Also, have you tried connecting only the V700 to the V350 without the others?

Try downloading a blank project, perform Initialize & Reset, then try your project again. Also, make sure any and all HMI screens in your project are called with transition contacts only.

I know the feeling.

3+3=6 3! (factorial)=1x2x3=6 https://en.wikipedia.org/wiki/Factorial

How much delay are you wanting? If it's 10ms or more, then just use a timer. I'll also point out that the ladder rungs in your post are exhibiting poor form. Refer to the example projects that came with your VisiLogic installation to see how to properly set up MODBUS commands. If you have questions I'll be happy to help.

3 + 3 = 3!

You can always use 8.8.8.8 and/or 8.8.4.4. These are free DNS Servers provided by Google. Also, that Default Gateway looks a bit suspect. Usually the last number is a 0, 1, or 255.

Yes, this is a big problem with the Snap-In modules. I always place a bit of duct tape (or similar) to secure the module. In high vibration environments without an unsecured module, the contacts can wear and lose connection. I have always wondered why Unitronics never provisioned for screws. All 4 corners have plenty of room for screws, similar to the ones that hold the back on the V570 (which, by the way, doesn't need screws!).

No you cannot. Note this section in the product installation guide:

I have quite a bit of experience using V700s (and most other products in the Vision line). No field failures in the 4 years or so that I've been using V700s. I suspect you got a one-off bad unit. It happens to the best of them. You might consider trying some possible solutions in one of the "stickied" posts about bricked PLCs. Sometimes they can be resurrected.

From the Help file:

Put those operands on an HMI screen so you can see them. I think alternating cables can interfere with RS485 operation. Make sure the PLC is rebooted after removing the programming cable and confirm in INFO Mode that the port is set to RS485.

Were you able to get your jumpers set correctly? What is the value of MI 89? Are you seeing any increment of DW 2 & DW 3? Does MB 343 turn on? What is activating MB 346? I would start troubleshooting by making MB 346 a positive transition contact rather than trying to run the communications continuously. Have you double checked the settings on the inverter?

We cannot help you if we can't see inside the Function Blocks.

The PLC IP address is set up in the TCP/IP Card Init Function Block in ladder. The TCP/IP Project settings are set to allow VisiLogic to communicate with the PLC via Ethernet. The fields in the Project settings should match the configuration in the PLC ladder in order to communicate successfully. From above, I see the PLC address as 192.168.0.1 and I see the MDBus set to 192.168.0.10. It looks like a typo in the TCP/IP Card Init FB, as you seem to have the PLC address and the Default Gateway set to the same address, which is unusual.

That section of the configuration is only applicable if the PLC is the Master. It defines the Slaves the Master will be communicating with. Since your PLC is a slave, you can ignore it.

I also include the VisiLogic version so that I don't inadvertently update the project to a newer version of VisiLogic.