Confronting the slave for ASi where it possesses the overload

摘要

PPROBLEM TO BE SOLVED: To provide an enhanced overload and short-circuit protecting circuit of a slave for an interface (AS-i) for an input/output apparatus including an actuator, a sensor and a load. PSOLUTION: To the overload and short-circuit protecting circuit comprising transistors T1 to T4, resistors R1 to R7, and a capacitor C1 or the like provided to the slave 1 including a slave main circuit 1A and receiving an AS-i power supply, a capacitor C3 is attached to prevent the overload and short-circuit protecting circuit from being operated at an overcurrent whose duration time is a prescribed time or below, and further a resistor R10 (or a series circuit comprising a resistor and a PTC thermister) is provided to supply a current I2 to the overload and short-circuit protecting circuit via the resistor R10 even when the overload and short-circuit protecting circuit is activated so as to prevent a sensor power supply current I from being zero thereby attenuating a rush current at sensor connection and to be capable of normally supplying power to the sensor. PCOPYRIGHT: (C)2006,JPO&NCIPI