How to set the PLC data retention function? -Solutions - Huaqiang Electronic Network

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The data retention setting defines how the CPU handles data retention tasks for each data zone. Selected in the data hold setting area is the data area to "hold" its data content. The so-called "hold" is to power on after the CPU is powered off, and the content of the data area remains in the state before the power is turned off. The data retention function set here is implemented in the following ways:
The data retention function set here is realized by the super capacitor built in the CPU. After the super capacitor is discharged, if the external battery (or the clock/battery for the CPU221/222) is installed, the battery card will continue to supply data. Until the discharge completed data is automatically written to the corresponding EEPROM data area before power-off (if MB0-MB13 is set to hold)

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