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PLC Reset?

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Hi guys,

I always wondering, what is reset when reset button is click?

Does the setting from address D from HMI will be lost?

Does internal memory of PLC is reset?

Anything thats not reset?

Or just reset sequence?

Thanks.

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A reset is similar to a power down/up secuence. A reset is neccessary to make new parameter settings failed for instance.
Programm is reset and internal relay's and registers are reset to initial ("0")

Battery backed / Latched relay's and registers retain their value. (the range differs according to the used CPU)

 

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On 3/3/2022 at 3:38 PM, VeeB said:

A reset is similar to a power down/up secuence. A reset is neccessary to make new parameter settings failed for instance.
Programm is reset and internal relay's and registers are reset to initial ("0")

Battery backed / Latched relay's and registers retain their value. (the range differs according to the used CPU)

 

How to check for battery backed relay and register?

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Project navigation  PARAMETER > PLC Parameter. 

Then select the device tab.

Any data points listed under Latch 2 Start - End will remain through power outages / reset.

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11 hours ago, WattUp said:

Project navigation  PARAMETER > PLC Parameter. 

Then select the device tab.

Any data points listed under Latch 2 Start - End will remain through power outages / reset.

Thanks!

So will need to set Start-End address for the Latch 2?

If none is set meaning all register will be clear upon PLC reset right?

How about if the value is set (Numerical input) in HMI, will the value be reset? I have encountered some reset and some doesnt. Or the HMI have their own memoy?

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Yes, you would want to add a start/end address that would be retained always. If memory space allows, i would just set this to the entire range of D. If not I typically would use 10,000 - end, that way I know the data location is up out of range with the rest of my address mapping.

I believe the HMI can have it's own memory, but I don't utilize that so i am not 100% sure.

 

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