The duplex group is installed in 2 adjoining elevators common to external requests (one button for external requests for both elevators). The internal requests are separate for each elevator

• It consists of 2 control panels (the first control panel contains the iD0 main control board, the connection board, and the 12-volt bridge, and the other control panel components)
• And (the second control panel contain the iD1 main control card, the 12-volt bridge, and the rest of the control components)
• Its function is to locate the elevator nearest to the required floor to save the time of ascending and descending the elevator, and thus saving electrical energy
• The duplex control board group consists of 3 boards (a control board for each elevator to deliver internal requests and an internal indicator and the CX connection board for connecting external requests and an external indicator)