| 摘要 |
A safety-extension base connected to a main base and a control method thereof are disclosed, the base includes a communication unit, a system state monitoring unit, a module control unit, a memory unit, a state conversion unit and a safety-processing unit. The communication unit performs data communication with the main base. The system state monitoring unit monitors a state of the PLC system using data communicated between the communication unit and the main base. The module control unit controls a general operation of the safety-extension base and outputs different cases of control signals according to whether or not the state of the PLC system is a normal state. The memory unit stores the data transmitted from the main base and a program and information, necessary for controlling the safety state of the safety-extension base. The state conversion unit converts the state of the safety-extension base into the normal state or safety state according to the control signal output from the module control unit. The safety-processing unit performs a control of the safety-extension base using the information transmitted from the main base, in a case the state of the safety-extension base is converted into the normal state by the state conversion unit, and performs a control of the safety-extension base according to a user-defined program previously stored in the memory unit, in a case the state of the safety-extension base is converted into the safety state by the state conversion unit. |
