This error is displayed when the SRAM area is not formatted on the V10/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 V10/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 on the following links.
 For V10: Click here.
 For V9: 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.