Control system and control method

A control system adapted to control a plurality of motors, the control system comprising:

• a primary host for actively controlling the plurality of motors;
• and
• a secondary host coupled to the primary host through a synchronization link and a transmission link different from the synchronization link, wherein
• the plurality of motors are coupled in a serial manner on the transmission link;
• the primary host transmits a first instruction to one of the plurality of motors through the transmission link and transmits a first synchronization signal corresponding to the first instruction through the synchronization link;
• and
• after the first instruction is transmitted, if the primary host does not receive a first response of the first instruction, the primary host notifies the secondary host that a failure occurs on the transmission link, wherein if the secondary host does not receive the first synchronization signal and the first instruction, the secondary host begins to actively control the plurality of motors.