The number of times the file system has received requests to open a file for writing. Opening a file for both reading and writing will cause this value to change. The POS should state if a power cycle causes the counter is be reset to zero. Additional information: Reset to the factory default value after a power cycle. Returns <noSuchName> status if attempting to access this object and there is no storage device is installed. This value is increamented when a file is opened.