Command board EC-CCB is the command board matched with elevator car top board EC-CTB. Each command board consists of 24 input and 22 output interfaces including 16 floor buttons and 8 function signals. It is in charge of the collection of button command and output of button indicator. The operation demands of 64 floors can be realized through cascading, while the operation demands of main/vice operation cabinet in the elevator car can be realized through parallel connection.