A seven core cable is a type of cable with seven wires, each of which has a different function. The following are the functions of the seven core wire:

1. Power cord: used to provide power.

2. Ground wire: used for grounding to ensure circuit safety.

3. Data cable: used for transmitting data.

4. Control line: used to control equipment’s functions such as switching, starting, and stopping.

5. Signal line: used to transmit signals, such as video signals, audio signals, etc.

6. Sensor cable: used to connect sensors and transmit their signals to the control system.

7. Communication cable: used for communication with external devices, such as connecting computers, networks, etc.