"always on" is a correct and usable phrase in written English. You can use it to describe something that is operating, running, or functioning without interruption or ceasing. Example: Our security system is always on, so you don't have to worry about anyone entering the premises.
"You're always on dates.
You're always on essentially.
The kettle's always on".
"We're always on board.
You're always on edge.
He's always on set.
"He was always on".
But it's always on.
You're always on duty".
You are always on.
"He's always on the phone.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu