| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To confirm not only an abnormality in a load and forgotten connection but also the presence or absence of erroneous connection between a relay and the load. <P>SOLUTION: Four load terminals for enabling the load to be connected are provided and an address is allowed to correspond to each load terminal. The load corresponding to each address is turned on and off by the relay. An on-switch and an off-switch are provided to separately instruct the on and off of the relay without using transmission signals. A signal processing section successively selects a state (S2) that all the relays are turned on for each operation (S1, S3, S6, S9, S12 and S15) of the off-switch and states (S5, S8, S11 and S14) where each relay is turned on, and a state (S21) that all the relays are turned off is selected by the operation of the off-switch (S16 to S20). <P>COPYRIGHT: (C)2004,JPO</p> |
