russedwards

Hi I am looking for some advice for a function I am looking to add to a V570. We are monitoring the amount if fluid lost in a small reservoir and I need to keep track of the water that is lost daily. At the moment I can quite easily take a reading at the start of the day, a reading at the end of the day, subtract the 2 using a Maths FB and get the result I am looking for. Now for the part that is confusing me! The reservoir can be topped up, so this would not make my reading accurate. For example, at the start of the day the level could read 1000 liters, at 12 pm the level could read 800 liters, but at 1 pm the reservoir could be topped back up to 1000 litres. At 5pm when I take my last reading reservoir level would could read 900 liters. Using my current calculating method, the result would show that the reservoir had only lost 100 liters when in fact I had actually lost 300 liters in total through the day. Is there anyway I can get the controller to "ignore" the topping up of the reservoir or allow for any increase in level? Any ideas would be gratefully received! Thanks

Hi guys I am currently using a simple netgear wnce2001 adapter to connect my V570's and V1210's to a wireless network. They work fine when used in a fixed position. My next project involves using a V570 in a mobile app,I cation around a factory. The problem I am currently facing is when the V570 and adapter is moved to a different part of the factory, it needs to connect to a different router and Wifi network. This means plugging the laptop into the adapter and reconfiguring. This isn't really practical so I am looking for an adapter that can be pre-configured with 2 or 3 wifi network settings so it will automatically connect when the V570 is moved. Does anyone have any experience of this problem, or know of an adapter that can be configured via the V570 rather than a laptop? Thanks in advance

Hi Is there a way to change the name of a file saved by Data Export? For example, my current schedule downloads the data from a data table after each complete test cycle is completed and the test finishes. Data Export then saves the data table to an Excel file named after the date and time of the download. Is there a way to change this so that the file is saved by another name (for example, a field within the data table). I would like to save each downloaded file by the serial number of the item that has just been tested. I hope this is clear! Thanks Russ Edwards

Hi I have successfully set up my V570 to give a 4-20 mamp output that relates to my pressure transmitter input of a range of 0-4.35 psi (4 mamp = 0 psi, 20mamp = 4.35 psi) In another part of my process, I need to change this linear output so that 0.5 psi = 20mamp. Can anyone tell me how to successfully do this? When I have tried to re-linearise the output, I am still getting the original output values even though I have linked the new, linearised MI to the output. Thanks

Hi Emil The valve we are using is a burkert 2865 http://www.buerkert.com/COM/Products/MFC-MFM-LFC-LFM-and-proportional-valves/Proportional-valves/2865.html We do not have the controller for this valve that converts a 4-20 signal to a pnp PWM control, we would like to link the valve directly to the V570 and use the pressure transmitter also linked to the V570 to control the valve.

Hi Can someone please shed some light on a problem for me?! I am fairly new to visilogic / unitronics and I am trying to control a proportional valve with a PWM block linked to an output. I am insure if I have the valve connected to the correct terminals of my V570. I have a V200-18-E3XB snap in board. I have a 24vdc +ve connected to the common connector of the digital output connector block. +ve terminal of the valve connected to O6 -ve terminal of valve connected to O0 I'm not sure that this is correct?

Hi I am looking to use an existing data table to trigger a data export function on my V570. For example i want to export the data via the ethernet connection when 5 rows of data have been logged. Is there a way i can read the number if rows that are written to, to trigger an event? Or will i need to add a separate sequence pointer to log keeo track of the logged data? Thanks

Good morning I am still fairly new to Visilogic so would like some advice about a new project I am planning. I currently use a V570 as a pressure controller, as the process runs, certain parameters are recorded to an MI and results are displayed at the end of the cycle (start pressure, end pressure and the pressure drop is calculated and displayed). What I would like to do is to record these parameters along with a user inputted serial number into the memory of the V570 (using data tables?). I would then like to transmit this data wirelessly after each test or 5 tests to a PC. Is this possible with the V570? Thank you in advance and Merry Christmas Russ Edwards

Hi emil Thanks for your reply. I have been through the pid help but I'm still struggling with how to connect the pid to an output and also how to use my linearised transmitter signal as an input

Hello again Thank you all for your recent help. I have certainly experienced a steep learning curve with Visilogic! I require some help with using a PID function to control the putput of one of my valves. The problem I have is that the valve is "chattering" when near to the setpoint, i.e opening and shutting very fast as the setpoint is reached. I need to slow down the operation of the output, the control does not need to be so precise - i.e control within +/- 3 mbar of the setpoint at 103 mbar, or only open again after 2 seconds of closing. I thought that I would use the PID function to sort this problem but I am really stuck. COuld anyone please help me in very simple terms, to show me how to implement the PID into my ladder? I am using MI 2 as a linearisation of a 4 to 20 mamp input ranged 0 to 1000 mbar. This is what I want to use as my process input. Set point is 103 mbar Control can be +/- 3 or 4 mbar Would like to control Output 8 with teh PID function. Thankyou in advance :)

Hello Again I need a final piece of help regarding Positive Transition Contacts. The problem I am having is this: I would like a single pulse upon loading an HMI / Sub Rouine that will activate a positive trans. contact. This in turn starts my test prodedure. I can activate this stage of the procudre manually with a tap of a push button, but I need to do this step automaitically. The problem I am having is that when I set the contacts, they remain pressed ON and I cannot reset it. IS it possible to add an automatic, single pulse when loading an HMI? I hope this is clear and thank you to everyone who has helped me out so far. It has been a very steep learning curve!

Hi Joe Thank you very much for the info. I've hardly any PLC experience before using visilogic, we've only used Eaton Easy series logic relays previously. The only way to perform a test sequence such as this was to use lots of contacts!

Hi Thanks you in advace for your help. I am a newbie with visilogic and I am struggling with the last subroutine of my program. I will explain what I want to happen: As HMI loads, O3 to automatically open until a set pressure is reached (103 mbar) O3 then closes and remains closed whilst a leak test is undertaken - if the pressure drops below 103 mbar during the test time, O3 should not re-open. As the set pressure is reached, a timer should be activated to start the leak test timer (10 seconds) At the end of the 10 seconds, if the pressure is below 100 mbar then HMI FAIL should load If the pressure is above 100 mbar then HMI PASS should load. When the program finishes, all timers shoudl be reset ready for the next run test. This is working ok the first time i run through the program, but when I restart the routine the timer is running before the set pressure is reached. I also cannot lockout the O3 control. Can anyone help?! I have attached screenshots of my ladder. Thanks Russ

Hi I am also having troubles with some other parts. When manually starting my routine to run with the touch of a start button, I can run through the sequence without any problems, I can also get the timers to automatically reset. I am having troubles getting my outputs to reset to the original values when moving onto a different sub routine. When the program finishes and restarts, I'm having some outputs stuck in their switched state, if that makes sense?,!

Hi Damian Thank you for your help, it is much appreciated. Your method does reset the timer but it i need it to operate and reset independant of the "pressure switch". I will explain what I am trying to achieve: Process starts with press of a button. High pressure inflation starts. When a set pressure is reached, the timer is triggered. Pressure is held until timer reaches 0 and then the next HMI / routine etc is loaded. This is working ok, but the problem I have is that when the process has fininshed and the user needs to restart the test on the next item, the timers are still held at 0 and have not reset to 15 seconds. I hope this is clear. All help and critique is greatly received as I am still learning a lot about Visilogic every day!! Thanks

Hi I am a newbie to Visilogic and I am really sturggling to reset me TD timers to the preset value after they have counted down (in this case 15 seconds). I have attached a screen shot of the visilogic screen of my current configuration of the timer. Please can someone help and tell me what I am doing wrong as I am pulling my hair out! Thanks Russ