Patent ID: 9187105
Filing Date: 2015-11-17
Classification: B61L

Abstract:
1. A control system comprising: a target device having an influence on safety of maintenance work; a control device for controlling the target device; and a terminal device manipulated by a worker performing the maintenance work, wherein the control device includes (i) a control unit for controlling the target device to enter a first state in which the worker is allowed to safely perform the maintenance work and (ii) a first communication unit for performing communication with the terminal device and for transmitting second information, indicating that the target device has entered the first state, to the terminal device, the terminal device includes (i) a first input unit for receiving an input manipulation by the worker, (ii) a request generation unit for generating a request directed to the control device, and (iii) a second communication unit for performing communication with the control device and for receiving the second information, after the second communication unit receives the second information, (i) the request generation unit generates a lock request to maintain the first state in response to the input manipulation and (ii) the second communication unit transmits the lock request, the first communication unit receives the lock request, the control unit transitions to a lock state in which the control unit controls the target device to maintain the first state, based on the lock request received by the first communication unit, the first communication unit transmits lock information specifying that the target device is maintained in the first state by the control unit, the second communication unit receives the lock information, after transmitting the lock request, the second communication unit transmits a release request to request release of the lock state according to the input manipulation received by the first input unit, the control unit releases the lock state based on the release request, the first communication unit transmits release information specifying that the lock state is released by the control unit, and the second communication unit receives the release information.