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An encoder input device includes a connection terminal to be connected to one of encoders and made common to a plurality of types of signal systems of the encoders, a plurality of power supplies for signals according to the plurality of types of signal systems of the encoders, and a software switch

An encoder input device includes a connection terminal to be connected to one of encoders and made common to a plurality of types of signal systems of the encoders, a plurality of power supplies for signals according to the plurality of types of signal systems of the encoders, and a software switch that switches connection arrangement between the connection terminal and the power supplies for signals in a software manner according to the signal system of the encoder connected to the connection terminal among the plurality of types of signal systems of the encoders.

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1. An encoder input device comprising: a connection terminal configured to be connected to one of a plurality of encoders and made common to a plurality of different types of signal systems of the plurality of encoders configured to provide information about a position of a motor;a plurality of powe

1. An encoder input device comprising: a connection terminal configured to be connected to one of a plurality of encoders and made common to a plurality of different types of signal systems of the plurality of encoders configured to provide information about a position of a motor;a plurality of power supplies which supply voltage for signals levels corresponding to the plurality of different types of signal systems of the plurality of encoders, respectively; anda software switch that switches connection arrangement between the connection terminal and the power supplies according to the signal system of an encoder, of the plurality of encoders, which is currently connected to the connection terminal, among the plurality of different types of signal systems of the plurality of encoders, to supply, via the connection terminal, the signals levels peculiar to the signal system of the encoder currently connected to the connection terminal,wherein the power supplies supply the voltage of different levels to the encoders to support the plurality of different types of signal systems. 2. The encoder input device according to claim 1, wherein the encoder input device is connected to a storage device that stores setting information indicating switching values of the software switch, and the software switch switches the connection arrangement between the connection terminal and the power supplies in accordance with the setting information. 3. The encoder input device according to claim 1, wherein the software switch switches the connection arrangement between the connection terminal and the power supplies for the signals levels corresponding to a differential system and an open collector system. 4. The encoder input device according to claim 1, wherein the software switch switches the connection arrangement between the connection terminal and the power supplies for the signals levels corresponding to a differential system and a transistor transistor logic (TTL) system. 5. The encoder input device according to claim 1, wherein the software switch switches the connection arrangement between the connection terminal and the power supplies for the signals levels corresponding to a transistor transistor logic (TTL) system and an open collector system. 6. The encoder input device according to claim 1, wherein the software switch switches the connection arrangement between the connection terminal and the power supplies for the signals levels corresponding to a differential system, a transistor transistor logic (TTL) system, and an open collector system. 7. The encoder input device according to claim 1, wherein the power supplies are configured to be connected to the software switch via respective control lines, and the software switch is configured to switch the respective control lines of the power supplies, so that the signals levels in correspondence to the signal system of the connected encoder are provided to the connected encoder via the connection terminal. 8. The encoder input device according to claim 7, further including field-effect transistors (FETs) each connected between the connection terminal and a respective power supply, of the power supplies, and having a gate connected to the respective control line. 9. The encoder input device according to claim 1, wherein the connection terminal includes: a first terminal configured to be connected to a first power supply and a second power supply, of the power supplies; anda second terminal which is connected to ground. 10. The encoder input device according to claim 9, wherein the connection terminal further includes a third terminal configured to be connected to a third power supply and to ground via a resistor. 11. An encoder input device comprising: a connection terminal configured to be connected to one of a plurality of encoders and made common to a plurality of types of signal systems of the plurality of encoders configured to provide information about a position of a motor;a plurality of power supplies which supply voltage for signals levels corresponding to the plurality of types of signal systems of the plurality of encoders, respectively; anda software switch that switches connection arrangement between the connection terminal and the power supplies according to the signal system of an encoder, of the plurality of encoders, which is currently connected to the connection terminal, among the plurality of types of signal systems of the plurality of encoders, to supply, via the connection terminal, the signals levels peculiar to the signal system of the encoder currently connected to the connection terminal,wherein the connection terminal includes:a first terminal configured to be connected to a first power supply and a second power supply, of the power supplies;a second terminal which is connected to ground; anda third terminal configured to be connected to a third power supply and to ground via a resistor.