Point M on the ladder diagram should be connected at terminal ___ on the relay socket.

In relay control systems depicted by ladder diagrams, each terminal on the relay socket corresponds to specific connections and functionalities in the circuit. Terminal 7 is typically designated for connecting the point where the designated control or signal input is intended to activate the relay.

When working with ladder logic, understanding the flow of control and how each component interacts is crucial. Terminal 7 might be utilized for a specific function, such as handling the input from a switch or sensor that triggers the operation of the relay. This position often reflects the correct association with the control logic laid out in the ladder diagram, ensuring that the circuit operates as intended when the conditions for activation are met.

The other terminals, while potentially serving different roles, do not correspond to the specified control point M in the context given. Therefore, connecting Point M to terminal 7 ensures proper functionality within the designated electrical schematic.