clint226

All good solutions - thank you everyone! I will probably go with the timer Ausman - thanks, I like your method a lot. I probably don't need this degree of accuracy for this particular application but I will explore it nonetheless. That knowledge will certainly be useful for future.

Hi support and forum members I have successfully used the Visilogic project examples to log data using an SD Card. However, the example program uses SB13 to write data to the SD card every 1 second. This is far too frequent for my application. I want to log data every minute, or every 10 minutes. How can I reduce the write frequency? Do I need to use some delay timers? Can anybody assist me with the correct/optimal ladder for this. Picture of code attached. I'd also like to know how to display the free space in MB or GB left on the SD card Best Regards

Hi All, I'm new to the PID/Autotune function and am having some issues getting a closed feedback loop up and running. To simplify my problem, I have a V130-J-TR6 with an IO-AI4-AO2 expansion module. I have a fan that is driven by a 0-10V analog analog output, and a duct setup to measure airflow using a pressure transducer with 4-20mA analog signal (Kimo CP201). The fan is connected to the 12Bit expansion module. The transducer is connected to an analog input on the PLC so it is 10-bit. From the sensor display I know the following: 1.2V ----> 0L/s (the fan doesn't cut in until voltage exceeds at least 1.2V) 10V----> 250L/s What I want to do is maintain a constant flow-rate of 175L/s but I don't completely understand how to set autotune up or what it's doing. Can someone please provide me some example ladder logic or .vlp file. I have tried using the v120 example in the help files with no luck. Surely this is a common application. All my equipment is new and I've run diagnostics with the multimeter so I know its not a hardware issue. Thanks