| 摘要 |
PURPOSE:To reduce the size of a power source connecting circuit, to make the degree of freedom of arrangement high, and to improve the operability. CONSTITUTION:A 1st sensor 23 detects that extended circuit being at a position right before the circuit is mounted on an external input/output terminal 12 or right after the circuit is detached. While the extended circuit is detached, a control circuit 25 opens a power source switch 27 in response to the detection of the 1st sensor and closes the power source switch on the detection of a 2nd sensor. While the extended circuit is mounted and connected, the control circuit opens the power source switch unless the 2nd sensor performs the detection and closes the power source switch unless the 1st sensor performs the detection 12. |
