xLogic SuperRelay User’s Manual106Note:The application example of xLogic is available free of charge to our clients, but we can’tmake any promise, it is only to explain the general rule of using xLogic. It is possible thatthese instances can be different from user’s specific application, so user should take allrelated responsibility of running those instance systems, and we sincerely suggest usershall refer to relevant nation standard and installation rules related to systems.Also, we have to point out that error is unavoidable, and we reserve the accordingmodification rights.5.1 Dual-function switchRequirements for stairway lighting systemsThe basic requirements for a stairway lighting system are as follows: When someone is using the stairs, the stairway lights should be on. If no one is in the stairway, the lights should go out in order to save energy.5.1.1 Standard solutionUp to now two methods were known to control such a lighting system: Pulse relay: When the lights are off, press any of the pushbuttons to switch onthe lights. When the lights are on, press any of the pushbuttons to switch off thelights again.Disadvantage: People often forget to switch off the lights Automatic stairway light switch: Press any one of the pushbuttons to switch onthe lights. The lights switch off again automatically when a preset off delay timehas expired.Disadvantage: You can't keep the lights switched on over an extended period oftime. The permanent on switch, usually installed inside the stairway lightingtimer unit, may be difficult or impossible to access.The wiring is the same for both systems.