There are 3 segment fasteners on the constitution object which are driven by electro-hydraulic actuators. Omron’s programmable logic controller automatically synchronizes the movement of each shutter when lowering or lifting. The PLC communicates with a touch panel (from the same manufacturer) from which command and control is possible. There is also another PLC and touch panel (in the command tower) from the same manufacturer that communicates with the above controller and can also be operated and monitored.