Abstract: A motor driver that supplies electrical power to a motor on a basis of a control command sent with a network communication period from a higher-level controller includes a network frame receiver that receives the control command, a user program processor that performs program processing of a user program generated by a user, a servo controller that outputs a servo control command based on the control command, and a drive controller the supplies electrical power based on the servo control command to the motor. When the user program processor performs the program processing, the user program processor starts the user program according to an activation signal generated at reception of the control command to cause the user program to perform the program processing on the control command in synchronization with timing when the network frame receiver receives the control command, and the servo controller outputs the servo control command.

Abstract: A context switching processing unit (112) performs context switching using a stack frame indicated by a stack pointer value. When a second program is being executed for more than a predetermined time after a first program calls the second program by a function call and the first program suspends execution, an execution state restoration preparation unit (109) constructs in a stack area for the first program, a first program stack frame which is a stack frame for restoring an execution state of the first program before the execution suspension, in accordance with a configuration of a stack frame used by the context switching processing unit (112). Further, the execution state restoration preparation unit (109) sets to the stack pointer value, a head address value of the first program stack frame.

Abstract: A power interrupting device has: an output terminal connected to a load; interruption circuits connected in parallel between a power source and the output terminal; and a control device controlling each interruption circuit. Each interruption circuit has: a switch element connected between the power source and an intermediate node, and ON/OFF controlled by an interruption signal output from the control device; and a rectifier connected such that a forward direction thereof is from the intermediate node to the output terminal. The control device sets the interruption circuits as a diagnosis target circuit in turn. The control device sets the interruption signal output to each interruption circuit such that the switch element of the diagnosis target circuit is OFF. Moreover, the control device determines, based on a voltage of the intermediate node of the diagnosis target circuit, whether an abnormality occurs in the diagnosis target circuit.

Abstract: A power interrupting device has: an output terminal connected to a load; interruption circuits connected in parallel between a power source and the output terminal; and a control device controlling each interruption circuit. Each interruption circuit has: a switch element connected between the power source and an intermediate node, and ON/OFF controlled by an interruption signal output from the control device; and a rectifier connected such that a forward direction thereof is from the intermediate node to the output terminal. The control device sets the interruption circuits as a diagnosis target circuit in turn. The control device sets the interruption signal output to each interruption circuit such that the switch element of the diagnosis target circuit is OFF. Moreover, the control device determines, based on a voltage of the intermediate node of the diagnosis target circuit, whether an abnormality occurs in the diagnosis target circuit.

Abstract: A circuit fault detection device includes: an interruption-signal generation unit that outputs an interruption signal for a drive circuit stopping driving of a drive target on a basis of the interruption signal; a pulse generation unit that includes an adjustment unit adjusting a time during which a pulse signal is in an OFF state and that generates the pulse signal; a signal synthesis unit that outputs a logical AND of the interruption signal and the pulse signal; a filter circuit that inputs, as an output, a signal obtained by delaying an output signal of the signal synthesis unit to the drive circuit; and a monitoring unit that determines whether a circuit fault has occurred on a basis of an output voltage of the filter circuit.

Abstract: A circuit fault detection device includes: an interruption-signal generation unit that outputs an interruption signal for a drive circuit stopping driving of a drive target on a basis of the interruption signal; a pulse generation unit that includes an adjustment unit adjusting a time during which a pulse signal is in an OFF state and that generates the pulse signal; a signal synthesis unit that outputs a logical AND of the interruption signal and the pulse signal; a filter circuit that inputs, as an output, a signal obtained by delaying an output signal of the signal synthesis unit to the drive circuit; and a monitoring unit that determines whether a circuit fault has occurred on a basis of an output voltage of the filter circuit.