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DaveB

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DaveB last won the day on March 12 2020

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  1. Hi Vincent, Sure, but the manual was in Spanish, so I translated it for you here below. Best regards There are many conditions or possible problems that may appear with SD cards or PenDrives. To maximize the compatibility of these elements, please follow the steps described below: · For this example an 8GB SD card has been used. · If you have important information in the device, make a backup 1) If you are using a virtual machine, make sure the USB port is linked to the VM 2) Open windows console (Execute CMD) 3) Execute “diskpart 4) Visualize “list disk”. This command will show all units. 5) Insert your SD/PenDrive 6) Execute again “list disk” A new unit will show up. If not, this is a problem between windows and the SD 7) Let’s suppose the unit appears in the list. Execute “select disk 2”. Disk 2 is the disk selected 8) Execute “list partition” Offset shouldn’t be 0 B 9) Execute “clean” DISKPART>clean This command will delete the partition of the selected disk. Make sure to select the right disk. Everything will be deleted. It will take a while. Be patient. 10) When the process is done, the message below will appear: DISKPART>clean Diskpart succeeded in cleaning the disk 11) Execute “list disk” again The selected disk will be marked with an asterisk * 12) Let’s suppose the disk is shown correctly. Execute “select disk 2” 13) Execute “list partition” DISKPART>list partition There are no partitions on this disk to show. 14) Execute “create partition primary” DISKPART>create partition primary Diskpart succeeded in creating the specified partition. 15) Execute “list partition” again DISKPART>list partition Offset shouldn’t be 0 B 16) Execute “detail partition” DISKPART>detail partition The file system is RAW (no format) 17) Format a new disk from windows with a cluster size of 4096 18) Execute “detail partition” again to confirm. File system now is FAT32 19) Execute “exit” to close diskpart DISKPART>exit Leaving DiskPart… 20) You can close command window (CMD) 21) Remove the SD/PenDrive safely 22) Insert the SD/Pendrive in the PLC 23) Go to UniApps or format with the SD Card Suite to generate the appropriate folder structure 24) Select Memory -> File Browser 25) For SD, you can verify the structure at Uniapps
  2. Hi all, First of all, thank you all for your great support. I finally could find the problem. There was something wrong with the SD cards. My Unitronics dealer sent me a manual on how to initialize the card using Diskpart commands and it worked. Now the Unistream is archiving the samples and CSV files correctly. Thanks again and best regards. DaveB
  3. Hi AlexUT, thanks for the quick response. I appreciate. 1. I didn't have the chance to test with my SD. My client is in a different town and I have limited access to his factory. But I've sent him a new SD to discard this problem. He will tell me with the result as soon as he receives it. And next time I will take mine to test with it. 2. Yes, I did that in FAT 32 and no errors. And the SD was working fine in my PC, being able to access the files inside. 3. I will also try that. but the SD was completely new... Thanks. I'll let you know as soon as I can check these points. Best regards
  4. Dear colleagues, Maybe you can help me. Something strange is happening with one project I'm working on. I've been developing an application for my client using my PLC, which is a Unistream Modular USP-104-B10. Once everything was ok and working perfectly, I modified the hardware configuration to match with my client's PLC, which is a Unistream Built-in standard US7-B5-R38 and I downloaded it. I only had to remove all references to the USP-B10 inputs and outputs in my ladder, change the PLC in the HW config, and set the new I/O of the US7 in the code. So, before I was capable to create Data Tables, convert them to CSV, download them through FTP to my laptop, use the File Browser element to copy them to a USB drive, use the Data Sampler to create graphs... But now, I can only download the CSV and Data Samples using FTP. I cannot see these files in the SD card using the File Browser in the PLC, and the PLC cannot represents graphs using the Data Sampler. So the SD card seems to be fine, as I can take the files through FTP from the PLC and works fine when I connect it in my laptop, but it looks like for the PLC the SD card is not ok, as it can't show the files neither work with them. Oh, and the graph freezes in "synchronizing" when I start the data sampling. Projects are exactly the same and the only different thing is the PLC and the SD card (formatted in FAT32, size 16GB but different manufacturer). Do you know what could be wrong? I'm running out of ideas. Many thanks, Dave B
  5. Dear colleagues, Regarding this topic, does anybody know how to build the frame or message via TCP to be sent to a 3G or 4G router to send SMS? I understand that this is possible with the "TCP/IP send" function in Visilogic, but if I am not mistaken, the message must contain a specific structure (user, password, destination number, message, etc) which may be different depending on the manufacturer. Having a look at the unitronics router UCR (https://myzone-kza3sadj.netdna-ssl.com/wp-content/uploads//2020/06/UCR_User_Manual.pdf) I can't find this structure for the message. Could you please help me? Thank you and best regards.
  6. Dear colleagues, I'd like to share my first project using Unistream. It consists in a test bench for an important manufacturer of industrial HVAC systems and compressors in a new factory in Spain. When a new compressor is finished in the production line, it has to pass the test bench in order to be suitable for selling. These compressors can reach up to 250 KVA of power in 50 or 60 Hz and there are three independent lines: - The first line is for machines from 200 to 460 volts in 50 and 60 Hz and up to 250 KVA. - The second line is for machines from 12 to 48 volts in 50 and 60 Hz - The third line is for machines from 12 to 48 volts in DC. I used Unistream mainly for three reasons: - I needed to communicate with 5 Modbus RTU slaves (Power meters). Comms are quite easy with Unilogic. - I needed to use function blocks to control the great amount of contactors during the commutations. I can also manage them individually in manual mode with a unique faceplate indexing the data of the instance based on the object pressed in the screen. I wanted to integrate also interlock management and the fail-to-start alarms so the function block was almost mandatory. - I had a big datalogging requirement with the test results with the powers, currents, voltages, power factor from all the power meters to allow the operator to analyze the data from the test. There was requirements for trends and for exporting the data to CSV files. So the control consists in a sequence of steps which also requires intervention of the operator to select the frequency, and voltage. Once this is selected, the PLC will close the contactor with the 50 Hz or will start the speed drive with 60 Hz. It will also close the correspondent output of the transformer with the selected voltage and then it will start the fine tuning by regulating a variac up or down acting as a voltage stabilizer. I tried to do this with a PID but it’s quiet complicate since the variac is not analogic. You have to increase or decrease the voltage on it through two digital outputs (up and down). Trying to tune this PID resulted into impossible or not reaching a minimum error between the setpoint and the output or continuously oscillating. So I created my own PID where I sent a continuous pulse or small pulses depending on the distance between SP and MV. With this and a configurable minimum error I could set the MV with less than 0.5 volt error. The part with the communications was quite tricky as I couldn’t communicate with the 5 Modbus RTU slaves at the speed I needed and I had continuous congestions making the RS485 network to crash. Since the values from the power meters were used as the MV for my PID, I needed more speed so we added the TCP module to three of them. Then I had Modbus TCP and RTU but the change in the network performance was very important. The datalogging part was also challenging, because of the amount of data. I added a “record” mode on each line to start the datalogging, create a new CSV and close it once the test was completed. I’d like to thank to my colleagues in Grupo Galiana (Spain) for developing and building this amazing machine and the Unitronics forum people for the help. It was really challenging but the effort was well worthwhile. Thanks to everyone. Best Regards
  7. Thank you guys. I thought this was slow even for serial comms. It would not be a problem if the read data would be just to display the values in the HMI, but I need them as Process Value for PIDs, so the tunning is becoming very hard. Thank and have a nice day DaveB
  8. Hi Alex, Thanks a lot. It worked!! I've noticed that the performance of the RS485 network is very slow. I takes around 3 seconds to read all the slaves (5 in total) with 5 Aperiodic Indirect Group Trigger functions. I don't have dropped packets but it is slow no matter the speed of the requests (I made a loop from 1 to 5 and i ask each slave in each step of the loop). I tried it also using periodic function but I had lots of problems with dropped packets. The network becomes saturated. Do you have any sugestion? I have to read 10 holding registers from 3 devices and 1 holding register from the other 2. Is there any way, maybe to request multiple holding register when they are consecutives? Maybe that will increase speed. I also configured the network to 115 kbps. Or maybe using other function as Modbus Aperiodic Direct? Thank you for your help and best regards.
  9. Dear colleagues. I hope you are doing fine. I have 5 power meters in a RS485 bus communicating through Modbus RTU with one Unistream which is acting as master. 3 of them are from the same brand and model. They are all ok, connecting and communicating. The registers are 32 bit length (treated as INT32 in the Unilogic). So far everything is good. For the other 2, from different manufacturer, It seems I am receiving the data in a strange way because the data is not coherent. It seems I am receiving the words or bytes inverted. if I use a external Modbus client in my laptot, I can see the value correctly displayed as a FLOAT32 ABCD and it matches with the actual value (12.3, 24.1, 48.3 volts... etc). In contrast, with the PLC I see gigantic values. I tried to use the swap byte funcions but couldn't get it. I don't know whether there is a way to compose a REAL from two INT... Does anybody ever had similar problems/solutions? I am kind of desperate. Thank you and best regards.
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