If you were planning to play online this Monday you’ll need to be connected to PSN before the downtime starts.
The announcement came via the Ask PlayStation Twitter account, where it’s been stated routine maintenance will be taking place from 10am Pacific Time until 5pm Pacific Time on the same day.
Routine PSN maintenance Monday 10/13, 10am-5pm Pacific time. Log in prior to retain online play/app access.— Ask PlayStation (@AskPlayStation) October 9, 2014
If you were hoping to play online with your PS3, PS4 or Vita during the maintenance period you will still be able to do so provided you’ve logged into PSN before the 10am cut-off point.