PTI (power take in)/PTO (power take out) mode switching control device based on PLC (programmable logic controller) control

The utility model discloses a PTI (power take in)/PTO (power take out) mode switching control device based on PLC (programmable logic controller) control, which is characterized by comprising a signal input control circuit, a main PLC controller, a PTI/PTO switching executing element and a communication circuit. An output terminal of the signal input control circuit is electrically connected with a signal input terminal of the main PLC controller, and an output terminal of the main PLC controller is electrically connected with an input terminal of the PTI/PTO switching executing element. The main PLC controller is electrically connected with a frequency converter bi-directionally. The input terminal of the PTI/PTO switching executing element is electrically connected with an output terminal of the frequency converter, and an output terminal of the PTI/PTO switching executing element is electrically connected with a shaft motor and a small start motor respectively to control the shaft motor or the small start motor to work alternatively. An input terminal of the communication circuit is electrically connected with a communication terminal of the main PLC controller, and an output terminal of the communication circuit is electrically connected with an external monitoring device bi-directionally. Reliability of a ship dynamic system is guaranteed, and economy, operability, security and the like of the ship dynamic system are improved greatly.