fat-chen

Data register lost when power off

5 posts in this topic

Hi, i'm new to plc.
I have complete my gx developer/got200 using mostly data register like count and timers. However i came across a problem. wheven ever electricity went off or i power off the plc. all data are lost. Is there a way to maintain these data in plc during power offline?

thank you.

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@fat-chen Please tell us which model do you use. I will assume that you use FX or Q series

For FX Series there are data register that latch with battery backup on some D register please check at programming manual for each model.

For Q Series you can adjust range for latch data with battery (if it is new inbox battery is in install under CPU but not connect with connector) in example (D300 - D500) that you can adjust them in PLC Parameter -> Device.

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Posted (edited)

If it's a default or constant value, you can just write sequence in the beginning of your program like:

Initial.thumb.jpg.51ef69271278c3dd25c65c

 

This way, when you power on the PLC or stop->run your program those values will be loaded in those data registers and you can modify D0 to D4 with HMI, if needed.

Edited by glavanov

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Thank you everyone. Fx3s it is. and i found out that some Data register are kept eeprom. Cheers

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