TM221 PLC - How to use the internal clcock

[JCardoso]

God Morning,

I am an individual professional, with a degree in electronic engineering. I'm doing an automation project for an industrial equipment. I need to use the internal clock of the TM221C24R PLC so that the program decides if the system was turned off due to a power cut in the network or if it was intentionally turned off by the operator.
I was thinking about setting a minimum time for a power cut of 3 minutes. If the cut is longer than 3 minutes, it would be an intentional cut by the operator.
How can I invoke the hh:mm built-in variables to establish an IF-Then-Else condition?

Someone can help me?
Thanks

José Cardoso

[VARFIC]

Hi.

Try check the variable of system like %SW.

There are some options to help in your issue

[JCardoso]

Hello VARFIC.

I tried before that Sistem Word, but I can´t reed or store that word anyware, to use it to compare the new S13 value in the next scan of the controler. I'm hardworking to chose a way to make it work, but till now with no success.

Anyway I thank you very mutch by trying help me.

[VARFIC]

Hi JCardoso

Try analyse the system word from %SW48 to %SW58.

To store de variables you need choose the retain variable on configuration.

Regards

[JCardoso]

Hi VARFIC

I will try your suggestion. It seems that will solve my problem. I had forgotten the retain variables.
As soon as I get a solution, I'll let you know.
Thank you very much.