This error is displayed when the SRAM area is not formatted on the V9 series unit.

<Causes>

The following conditions cause this error.

A.     When a screen program that uses SRAM is transferred for the first time after
        purchase

B.      When the battery voltage drops and the SRAM area is erased on MONITOUCH
         to which a screen program that uses SRAM has been transferred

<Solutions>

Case A

Format the SRAM area.

Perform formatting on the SRAM Setting screen in Local mode.
For information on the format procedure, click here.

Case B

The message "Battery changeover required" is displayed at the lower right of the System Information screen in Local mode on the V9 series unit.

Purchase a "V9-BT" or a "V7-BT" battery and perform battery replacement.
For information on the model name of a replacement battery, click here.
For information on the battery replacement procedure, click here.

The error does not disappear just by replacing the battery. Always format the SRAM area.
For information on the format procedure, click here.

* If Error: 161 (SRAM: x) appears due to a battery voltage drop, all data stored in
   SRAM is erased. The data cannot be restored.
   The service life of the battery is about 5 years. Replace the battery before the end
   of its service life.