Patko
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Posts posted by Patko
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Version software: 1.33.236
Hello,
I communicate with the frequency converter and the PLC via modbus. I have an absolute sensor connected directly to a frequency converter.
I read the parameters from the frequency converter. I need to read the value of the current revolutions (rev). I can read this using two parameters:
PAR543 - HighWord Actual Position
PAR544 - Actual LowWord positionIt is a word ( int16 ) value. How do I combine them into a double word so that it shows me a real value, comparable to the revolutions shown in the frequency converter.
Thank you
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1. Yes I have a PC and VFD connection, via USB (pc) -RS232-RJ12 (vfd). I use NORDCON 2.8.6.1 software
2. Yes, I downloaded and installed the QModBus 0.2.1 software
3. I asked the support who lent me the VFD, I will call him again to confirm it.
4. VFDs with a new processor all have the option of communication via MODBUS RTU
I sent you anydesk in a private message.
Thank you
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I have it in parameter 509 set to USS.
If you have time, can't we connect through Teamwiever or Anydesk?
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Hello kratmel,
I finally have the right VFD. But I can't start communication. status is 3, which indicates an error. Through NORDCON I set the source of the control word USS, baud rate I have set the same in VFD and in PLC.
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When I spoke with technical support from NORD, they told me that they would set the exact positions through VFD and according to the agreement I would just send the value of the position. For example, position 2 will be in drive 2650 but I will only send number 2 from the PLC to the drive.
Only one position will be positions 1-12. When the drawer is pulled out, the motor stop (positioning) is controlled by inductive sensors.
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We are going to make an automated rack (warehouse) with 12 positions. We will have two engines and two VFDs. One motor will control the "elevator" up and down and the other motor will pull and slide the drawer.
The motor for controlling the "elevator" will have an absolute sensor that will position the individual positions.
Everything will be controlled via VFD, but the PLC must be the master through which the position is entered, and through the ladder and sensors it will automatically select whether to pull or slide the drawer and thus send a command whether the motor should go backwards or forwards.
You are welcome, I was happy to provide this information.
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I called with technical support from NORD and currently it is so that all VFDs can communicate via MODBUS RTU. This PDF is old, and it is true that at that time only VFD versions 540E and above could do it, but then they updated the processors and all VFDs can do it.
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Tomorrow I will take over with the sales representative and technical support from the Nord, because they assured me that there will be no problem with MODBUS RTU and it seems that it will be. Engines with selected VFDs are already ordered but it probably won't work ...
Thanks for the advice, I'll let you know what the solution was. If necessary, do you have an example of how to do it to communicate properly?
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Yes, you are right according to this pdf and MODBUS RTU is only supported from version SK540E. : /. In this case, should I buy another module on UniStream or does it need to be solved on the NORD side?
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All right, I'll try to start a VFD connection with the NORDCON software, if I manage, I'll write here.
Thank you.
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Do you mean NORDCON software? Yes, I have, but he doesn't want to connect me to VFD, I'm still trying to know if I have the wrong cable or what's the problem.
Yes, I have a test panel for VFD.
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For testing I have borrowed a test station that has a frequency converter and a motor (the label is in the pictures test_Station). We will use two frequency converters and two motors for the application itself, on one of them there will be an absolute sensor (configuration in pictures NORD1,2,3,4,5)
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I use PLC unitronics US10-B10-T42 and a frequency converter from NORD. The frequency converter contains an absolute encoder for positioning. The connection is via MODBUS RS485.
I thought it would be easier but I can't get advice on how to get the necessary command from the PLC to the frequency converter. What format should it be. I've seen that a periodic or aperiodic coil / register must be used but I don't know what it should look like in a ladder, what all has to be there.
I also looked at the examples Unitronics Unilogic Examples \ UniLogic Examples_V1.30 Rev 52 \ Communications \ MODBUS RS485 \ UniStream_070_Modbus_RS485_Master_Aperiodic but I don't know if this is exactly what I need.
If someone was dealing with such a communication and sent me an example for inspiration or could help me, I would be grateful.
well thank you
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On 28. 7. 2020 at 21:01, Flex727 said:
Používam UniLogic 1.28.34 a nevidím žiadny spôsob, ako pridať reťazcovú premennú do tela e-mailu. Uniká mi niečo? Ak nie, vie niekto o alternatívnom riešení?
Hello Flex,
unable to insert string into email body. When composing an email, "string variable" is missing, but alternatively use "Subject" in the email. Using the "insert to string" function, it is possible to compose the final string and use it as a "subject".
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Hello,
It is probably still not possible to compare two projects in unilogic.
Could this requirement not be included in the next version of Unilogic?
It would definitely help more users.
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Thanks for the answers. When I use the UIS - 04PTN module, I can also use these PT100, 2 wire sensors?
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Hi, can anyone please advise me. This temperature sensor can be used for PLC Unistream U-USC-B10-TR22, 10DI, 2AI, 2TO, 8RO. If not, what sensor to use so that it can be used with this plc.
The project is a hygienic container where we need to measure the temperature of waste during fermentation.
Link for sensor: https://www.tme.eu/sk/details/se011/teplotne-sondy-a-adaptery/pico-technology/
word to double word
in UniLogic Software
Posted
it works this way too.
Thank you