Which two statements are correct about solenoid 1M1's operation?

The statement regarding solenoid 1M1's operation being energized when both S1 and S2 are pressed is correct because it typically reflects a situation where dual pushbuttons are used for safety or operational confirmation. In many control systems, engaging both S1 and S2 is a design feature to ensure that critical actions, such as energizing a solenoid, only occur when multiple conditions are satisfied. This adds a layer of safety by preventing accidental energization from a single button press, which is particularly important in industrial settings.

This operational requirement also aligns with the logic that governs many control devices where redundancy is important to prevent hazards. Thus, pressing both buttons is a necessary condition for the solenoid to activate.

The other statements do provide contrasting situations, focusing on the solenoid's activation under varying conditions, but they either describe the solenoid's behaviors when conditions are not met or imply an always-on state, which does not align with the typical functionality described for solenoids in control systems.