| 摘要 |
<p>PURPOSE:To exactly evaluate a consumed state of a battery by the same reference by deriving an end voltage in accordance with combination of input/output units which are being used at present, and comparing this end voltage and a voltage of the battery. CONSTITUTION:When input/output units U1, U2...Un are operating, or before they operate, an end voltage setting part 2 can derive the present optimal end voltage V, based on a switching state of an inputted changeover switch 1. This end voltage V is inputted to a comparing part 3, and in this comparing part 3, a voltage E of a battery 4 is inputted for comparison in advance. The comparator 3 outputs an active signal only at the time of E<V. This signal is inputted to a power source cutting-off part 5, and used for stopping all or a part of the input/output units U1, U2...Un. Accordingly, a degree of consumption of the battery is evaluated exactly by the same reference, irrespective of which combination of the input/output units U1, U2...Un is operating, and supply of a power source to the input/output units U1, U2...Un can be stopped.</p> |
