| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a field instrument having a high degree of freedom of specification change that makes an additional function available through purchase of a license key as required, and having an appropriate cost-effectiveness. <P>SOLUTION: A field instrument provided with standard functions and additional functions comprises an additional function management means for performing management so that the additional functions are freely available in a predetermined period that is set as a trial period and after the trial period has passed, they are available through purchase of predetermined license keys. <P>COPYRIGHT: (C)2012,JPO&INPIT |
