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kratmel

MVP 2023
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Posts posted by kratmel

  1. Reading 4 meters with MODBUS RS485

    in UniLogic Software

    Posted

    Hi,

    In Unilogic you can download an example from Unitronics and find the Communication folder. Please use the aperiodic Modbus master as an example.

    You can find a bit array in a tag, but you can also create a tag with the required array of voltage or current variables. As I saw from your photos, you read each variable at a separate address. Which at low transmission speeds significantly slows down the process.

    The Modbus communication standard provides the ability to read many variables whose addresses are sequentially starting from a specific specified starting address. Unfortunately, I do not have a device similar to your device to try to do. Maybe someone from the forum tried to do it in Unistream.

    I did things like that in Visilogic, but there was a slightly different approach to working with the Modbus network.

     

     

  2. Reading 4 meters with MODBUS RS485

    in UniLogic Software

    Posted

    Hi,

    as I thought - the addresses of the registers you need to read are nearby. I don't know if your meter supports sequential reading of a number of registers by one command. Therefore, I advise you to try to use an array of registers instead of one in the Unistream settings - for example 3 in the voltage read command.

    If you manage to perform such a trick, you will need significantly fewer consecutive commands from all devices to read your parameters.

    Probably faster to transfer a lot of apples in the basket than to send them one by one.

  4. Reading 4 meters with MODBUS RS485

    in UniLogic Software

    Posted

    To solve your problem, you need to determine if the polling speed of one meter is sufficient (that is, if you connect only one).

    If so, you can add three more RS485 modules to your PLC and communicate with all of them at the same time.

    This is how a slightly different problem was solved in this way. But this is probably the only way in your case.

     

     

  5. Reading 4 meters with MODBUS RS485

    in UniLogic Software

    Posted

    Hi.

    In my opinion, if you need almost instantaneous control of current or voltage and all frequency converters and control panel are installed in one cabinet - it is best to use analog outputs of frequency converters and analog inputs in the PLC.

    There is at least one analog output on the frequency converter - you can probably program the voltage or current there.

    If you still need to do it online - Ethernet or CANopen are standard and quick solutions.

    In Unitronics you can also make a hybrid decision - read information about analog inputs value (voltage on VFD analog output) using the Ethernet extension URB-TCP.

     

    P.S. We must state the fact that the Modbus through the two-wire RS485 line is quite slow and at the same time can not work at maximum speed in conditions of interference from the VFD inverter.

  7. Connecting Unilogic PLC to another device such as an amazon Fire tablet via USB-C to Ethernet converter

    in UniStream: Hardware

    Posted

    I tried to play with different options for replacing the Unitronics (Vision and Unistream) touch screen, but the available on the secondary market (not Unitronics) are only the touch screen for the V1210 (front sticker and touchscreen included). All other non-original touch screens I tested did not match the parameters used in different panels from Unitronics.

    At the same time, I managed to buy the display screen themselves from third-party manufacturers and use them instead of the original ones. There are also problems with a working temperature range for non original screens. Almost all non-originals do not allow work at sub-zero temperatures.

    Therefore, the only option for you is to order a front panel with a built-in touchscreen from the Unitronics seller.

    In my country, I had the opportunity to see the ordered front panel with touch screens for Unistream and successfully replaced the damaged one.

  12. BOOT Error [code 1]

    in UniLogic Software

    Posted

    Question: Is the Unistream panel new out of the box?

    I encountered a problem when using a not new old version of the panel with a new CPU. The problem was a little different - but I could not overcome this problem. I replaced the panel with a new one from the box and everything started to work.

  21. Technical documentation Vision

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi,

    All available information about the technical characteristics and hardware configurations is available on the unitronics.com website.

    Information about how the software, routines, and interrupts work can be found in the Visilogic Help.

    At the same time, the operation of the operating system, circuitry and internal software are the intellectual property of the Unitronics company and it is probably not in open sources.

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