clint226
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Posts posted by clint226
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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
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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
Data Logging Frequency
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
Posted
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.