working hours counter

Irbis · Post by **Irbis** » 20/10/2021, 7:27

Hello everyone, in my automation program for an ammonia compressor I made an hour meter but every time the HMI is turned off it clears the working hours.
My question is if there is a way to keep the operating hours variables no matter the HMI is turned off?

Post by **Pixsys tecnico 1** » 20/10/2021, 9:37

Hi,
you need simply use RETAIN variables with the FuntionBlock, in you case CON_SEC, CON_MIN and CON_HOUR.
In this way the times are stored also after a power off and the FunctionBlock continues to increase that values.

Irbis · Post by **Irbis** » 20/10/2021, 16:48

Pixsys tecnico 1 wrote:Hi,
you need simply use RETAIN variables with the FuntionBlock, in you case CON_SEC, CON_MIN and CON_HOUR.
In this way the times are stored also after a power off and the FunctionBlock continues to increase that values.

Hello Mr. Pixsys I did what you suggested but it still does not store the time value after a shutdown of the HMI pixsys 810.
Can you please send me an example?

Post by **Pixsys tecnico 1** » 21/10/2021, 9:34

Keep in mind that the retain value is stored every 30 seconds, so the power on time must be at least that time.

To set the attribute "retain" to a variable:

retain_attribute.PNG

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