A numerical control device that controls a machine tool that machines work by moving a tool relatively to the work on the basis of a machining program includes a analyzing unit that analyzes the machining program and generates movement command data, a detecting unit that detects abnormality during the machining, a retract control unit that supplies, when abnormality is detected, an operation command for a retract operation for retracting the tool from the work, and an integrating unit that integrates a movement amount of the tool based on the supplied operation command. The analyzing unit executes a tool retraction program for moving the tool or the work to a predetermined position after adding the movement amount of the tool integrated by the integrating unit to a coordinate value of the tool on the machining program to update the coordinate value at a point in time when the retract operation ends.

A numerical control device that controls a machine tool that machines work by moving a tool relatively to the work on the basis of a machining program includes a analyzing unit that analyzes the machining program and generates movement command data, a detecting unit that detects abnormality during the machining, a retract control unit that supplies, when abnormality is detected, an operation command for a retract operation for retracting the tool from the work, and an integrating unit that integrates a movement amount of the tool based on the supplied operation command. The analyzing unit executes a tool retraction program for moving the tool or the work to a predetermined position after adding the movement amount of the tool integrated by the integrating unit to a coordinate value of the tool on the machining program to update the coordinate value at a point in time when the retract operation ends.

A machine tool includes a motor configured to rotate a spindle, a tool magazine holding a plurality of tools, and a controller. The controller has a storage unit storing motor information indicating that the motor is a synchronous motor. When the machine tool stops, while a tool exchange process is carried out, due to electric power outage, operation of a stop button, a value of a drive current of the motor, or a value output from the sensor, the controller uses a command for the synchronous motor, based on the motor information, as a part of a series of commands for recovery of the machine tool, where the tool exchange process is a process in which a tool attached to the spindle is changed with one of the plurality of tools of the tool magazine.

Provided are an interruption recovery method for a machine tool machining file and a machine tool applying the method. The interruption recovery method includes: generating first check information when a machine tool machining file is executed, the machine tool machining file being stored in an external memory; generating second check information when the machine tool machining file is re-executed after an interruption occurs; comparing the first check information and the second check information to determine whether the machine tool machining file is changed before and after the interruption; and recovering the execution of the machine tool machining file when the first check information matches the second check information. By generating and comparing the check information before and after the interruption to verify the integrity and consistency of data of the machine tool machining file, the machine tool machining can be carried out accurately and unerringly.

Provided are an interruption recovery method for a machine tool machining file and a machine tool applying the method. The interruption recovery method includes: generating first check information when a machine tool machining file is executed, the machine tool machining file being stored in an external memory; generating second check information when the machine tool machining file is re-executed after an interruption occurs; comparing the first check information and the second check information to determine whether the machine tool machining file is changed before and after the interruption; and recovering the execution of the machine tool machining file when the first check information matches the second check information. By generating and comparing the check information before and after the interruption to verify the integrity and consistency of data of the machine tool machining file, the machine tool machining can be carried out accurately and unerringly.

The present invention relates to location recognition and recovery of an elevator system, and belongs to the technical field of elevators. The elevator system of the present invention has a location recovery/recognition system comprising: a landing floor information component or a calling component, a sensing component arranged corresponding to each landing floor information component or calling component and coupled to the landing floor information component or calling component, and a trigger component mounted on the elevator car.

The present invention relates to location recognition and recovery of an elevator system, and belongs to the technical field of elevators. The elevator system of the present invention has a location recovery/recognition system comprising: a landing floor information component or a calling component, a sensing component arranged corresponding to each landing floor information component or calling component and coupled to the landing floor information component or calling component, and a trigger component mounted on the elevator car.

An operation management device includes: a machining program information acquisition unit acquiring information related to machining program executed in the machine tool; a signaling information acquisition unit acquiring signaling information related to signals detected during execution of the machining programs in the machine tool; and an associated-information creation unit associating the information related to the machining program with the signaling information; and a search/display unit displaying the information related to the machining program and the signaling information, which are associated by the associated-information creation unit.

A control unit included in a PLC generates power-cut retaining information to be retained at a power cut, and stores the generated power-cut retaining information into a main memory. The control unit includes a file system unit for reading and writing target information from and into a nonvolatile memory. When the file system unit receives a power cut notification indicating a cut of power fed while reading or writing target information from or into a nonvolatile memory, the file system unit stops the reading or writing process, and writes the power-cut retaining information stored in the main memory into the nonvolatile memory using power fed from the auxiliary power supply.

A control unit included in a PLC generates power-cut retaining information to be retained at a power cut, and stores the generated power-cut retaining information into a main memory. The control unit includes a file system unit for reading and writing target information from and into a nonvolatile memory. When the file system unit receives a power cut notification indicating a cut of power fed while reading or writing target information from or into a nonvolatile memory, the file system unit stops the reading or writing process, and writes the power-cut retaining information stored in the main memory into the nonvolatile memory using power fed from the auxiliary power supply.