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Found 142 results

  1. Hello, I'm just starting my first project with UniStream/UniLogic and I have the PLC hooked to a PC via Modbus, PLC as Slave. I haven't found a way to sync the clock in PLC with the PC clock. Is there a way to set the PLC clock via the Modbus ? Thanks, Bjarni
  2. Hello! I am tracking some values in my application thru MQTT and would like to trigger a publish event if for example a value changes for a fixed amount or percentage. What I am using right now is periodic transfer but would like to save some bandwidth if data isn't changing much. Also, I need some kind of general solution to implement it on 50 values. Let me give you an example: we are monitoring an outside temperature. The sensor is quite unstable and changes in tenths every few seconds. It's value table at 10am might look like this: 10:00:01 102 = 10,2 degrees C 10:00:02 102 10:00:03 103 10:00:04 104 10:00:05 104 10:00:06 103 10:00:06 103 ... You get the idea. Now, I do not need to transfer these minor changes to my broker every second or on every change. I would like to detect a change of 5 tenths and only then send the data to my server. And periodically every hour for example to have records with timestamps. What are the possible solutions with UniLogic to achieve this kind of reaction with hysteresis? Regards, Ales
  3. Dear, I'm trying to copy a file from a DOK to the SD; the status stay always at 1 and never change (and the file is not copied). The function is "called" by a HMI button that set a bit...in the same ladder rung this bit is reset...then is called just one time. If something in the UDFB was not set properly I should had a negative value...but this doesn't happens. What can be? thnaks
  4. Hello, I am a beginner and am having trouble completing this task. I am trying to turn outputs on from a push button for about 30 seconds, then off for 2 minutes, then on again for 30 seconds. Repeat 5 times. After the 5th time, I would like to increase the off to 4 hours. This happens until someone manually presses the reset button on the HMI. Any help would be appreciated. Thanks
  5. Hi all, It is possible to change screen on web server from ladder? I tried do it by action function but I can choose there only HMI screen. I need it to inform remote user about alarms. User often have web page minimilized on windows try and he want to be inform about alarms by web page icon blinking, maximalize web page or some alarm sound on his computer. How I can solve this issue?
  6. Not much to add to the title. When using a timer.out bit to trigger a digital alarm, UniStream is not detecting it. I had to set a bit with the positive transition of the timer, and then reset it after the alarm state has been activated.
  7. Hello, my PLC has been working for the last 3-4 weeks. One day I come in and it starts to give me this error. The firmware is up to date (unless there was an update within the last month or so). Any help would be appreciated.
  8. I decided to use Internal Control Bit Arrays 2 x(255) on this large project to keep the global tag list manageable. I need to reset all these bits with an HMI button. Is there a way to reset an entire bit array? I get compile errors when attempting to use the reset coil. I really really don't want to have to put reset coils in for 500+ bits Thanks in advance
  9. Hey, Each day we want to start writing data to a new file. Our file name string is updating fine using the rtc to ascii UDFB, but our store DTI to File status turns 1 when the filename is updated with the new date. Then after another full "day" it becomes -35. However if we never change the filename the data recording continues to work fine. I apologize if this is already explained in another forum but I wasn't able to find one. Thanks for any help your willing to give.
  10. Hello, We are able to log sensor data to the data table, we record it once every 5 seconds. However, after 10 recordings we are trying to write the 10 lines to a csv file. (Ideally appending it) Firstly, appending just doesn't work (when we put the 1), the file doesn't update at all. When we put 0 to override, the values go in but only one and a half rows. Any ideas? Thanks!
  11. Hi everyone, We were given a lot of calculations to perform based off of the input values from our sensors. These calculations include square roots, arc tans, etc. as well as decimal constants such as 0.3874638 for example. We've tried to scale all our numbers so we can work with everything in integers but the function on the screen is getting very large and complicated. Performing these calculations in coding languages like python would be very straightforward. I'm wondering if there is a simpler way in unilogic to perform these large calculations or any tips to keep our screen from becoming so full that it will be impossible to debug errors. Thanks!
  12. Hey, For some reason my UIA-0800N is getting readings without my CT being plugged in its a fluctuating number and its happening with all inputs. Also does anyone know how to scale a CT(current transducer) and why when i put a constant voltage source in as an input it still fluctuates? Thanks
  13. Hi all, I have button on the screen. When touched, one out of many actions is to set certain bit high in logic to enable rung (if button is not touched, the rung does not perform anything). The rung works nice and perform everything as expected, except for the enable bit stays 'set'. The function 'reset bit' is only for integers. I do not want to use entire integer to enable/disable rung. If used integer to enable rung, the action from HMI can be increment/decrement only, therefore I would have to put there two conditions :equal-less 0 then store 0 and equal-greater 1 as conditions then store 1, to actually stay in 0-1 range. Or is it possible to access integers that are used for data types 'bit', then I could use the premade function reset bit (in integer) like mask byte in assembler. Does anyone have any better idea how to do it, please? Thanks
  14. Hi all, If I get the infinity in real data type, what could be the reason, please? (I have checked if I div by zero.) I also have tried to store the same exact value through the program into that variable. Still "infinity" in the last rung/DTI table when I am online. Thanks for any help.
  15. Hi All, I'm new to this and desperately require your help. I give up.....i'm trying to create a program to activate two timers when a button is pressed. I've created the Ladder and can get my green icon to show for 3 seconds when I push the corresponding button but I just can't get the relay to energies for the set amount of time. When the relevant button is pressed the output energies for as long as the button is pressed and completely disregards the output timer. Could anyone look at the attached to see what i'm doing wrong please? Thanks Justin EID Speed Lanes_ modified1.ulpr
  16. Hi all, Would you mind to show me some example how to treat INT16 as a power in W and its scale factor INT16 received via Modbus, please? Should I firstly convert them into Real, then multiply them? Thanks
  17. Hi all, I realise that I can reboot from UniApps but is it possible to do a reboot from Ladder/HMI. Reason being, my Modbus IP comms (over 3G) seems to get 'bogged down' after a few weeks/months and stops communicating. My golf course customer then angrily complains when his lake overfills because the fill pumps haven't stopped as comms is lost, I then log on and reset it manually from UniApps and away it goes again until next time. Id like to routinely reboot the PLC to prevent this scenario and also have a button on the HMI for the end user to press if needed rather than calling me.
  18. I'm trying to use a for loop to go through each index of an array and get averages for the total array. I need to do with on 8 arrays so I need to also use a global array to store the averaged values. How do i use global variables in C functions or declare them in C Functions?
  19. Why can not I change the arguments of function C. When I put the cursor on the line with the name of the function, do not enter any characters from the keyboard?
  20. Hi, I need to generate a random number (integer) values between 1 and 10 (or 100) in UniLogic. Is there a special FB? If not, could you pls. share UDFB?
  21. Hi everyone! I need advice what is the right way to load from an array? Below is picture of my ladder, where is also shown previously stored data in the same array that I want to load from. Rung 6 - data is saved from C (TalkKgIzmereno) into B ( Array Talk[Array Talk_0] ) Rung 7 - I want to load result from B ( Array Talk[Array Talk_0] ) into C (proba) Storing in Array woks perfect, but didn't have success to load... Thanks in advance! Petar
  22. dears All, I will have to modify an old project where I used a lot of retained tags (was my first project and I was not very skilled...for sure worst than now 😁 )...I want to replace the retained tags with a struct referred at a DTI...then save this on the SD. my question is...if I will upload a new project , the same but with more UDFB-tags etc, the retained tags that are used at the moment still contain the same value or will be reset? just to know if I can do this without problem, because I will also update the PLC version, or if I have to think something to save the retained tags and upload these later. thanks
  23. Hello! I am a senior at UNew Haven in CT, currently building a machine that should mix gravel and water. I am a mechanical engineer so I have no idea what to do or where to begin! I am using the Unitronics tutorials but they are long and my time is limited We are using a VFD and V570 with PLC and HMI. I need the PLC to: 1. Move a linear actuator up and down 2. Using the VFD, to control the speed of the mixer 3. Control the duration of mixing (Created a preset keypad timer but not sure how to make number buttons and how to embed them to the keypad.) Any help or guidance would be very much appreciated Best
  24. Hi all and thanks in advance, I have a program running un a Uni stream USP-070-B10. Using software version 1.25.61 UniLogic studio. I am trying to find a bit that will tell me if any Alarm is active, I have looked thru the help file, system variables, and searched this forum. I did find a comment from Saragani posted July 1, 2015 stating: " On the next version (1.15), it is planned to have a tag that contains: * An array of 32 bits (one per group * An array of 1025 Bits ( 1 spare bit + 1 bit per alarm) * A bit that indicates that 1 or more alarms are active * An interger with the total number of active alarms" Am I just blind and missing something? or did it not get added? The reason I am looking for this is I have a client with a remote cabinet with the PLC in it (no network connection or outside connection but power), they want a light added to the top of the cabinet and turne don if any alarm is active so they can see they need to go out there... Thank you for any assistance you may be able to provide, Bob
  25. Hello, I have a rain bucket to monitor every 0.1mm of rainfall. I would like to display how much rain there has been within the last 24 hours, 7 days and month. I thought the best way might be to use a data table and 'insert row' which would push out old values, but to then acquire the sum of the data table is a convoluted process. Any suggestions on how I could achieve my goal?
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