| 摘要 |
PROBLEM TO BE SOLVED: To protect a slave for interfacing input and output devices which include an actuator and a sensor (ASi) for overloading and short-circuiting with a low-cost circuit. SOLUTION: A slave unit 1, that has a slave unit main circuit 1A and is connected to an ASi power supply, is provided with a circuit consisting of resistors R1, 2, 3 to R5, 6, 7, transistors T0 to T4, a capacitor C1, etc. Normally, the transistor 1 is kept in an 'on' state, but momentary 'on' states are repeated for a fixed cycle, if an overcurrent or a short-circuit current is caused to flow. This structure makes an expensive IC circuit that has conventionally been used to be dispensed with. |
