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The hydraulic control system is controlled by PLC programmable controller and controlled step by step by local control panel. The local control cabinet is equipped with a "local / remote" control switch corresponding to the gate control. When in the "local" position, the control button on the local control cabinet can be operated manually to control the opening and closing of the gate; In the "remote" position, it receives the control signal (passive contact) of the computer monitoring system to realize automatic remote control operation. The local control cabinet is also equipped with "automatic / step-by-step" control mode switch corresponding to the control of each gate. When in the "automatic" position, the gate can be opened and closed continuously and automatically; In the "step-by-step" position, the gate can be opened and closed step by step with the continuous intervention of the operator. The "automatic / step-by-step" control mode change-over switch works only when the control right change-over switch is in the "local" position. Once the control mode is set, it will be locked with each other to prevent misoperation.