Timers in GX Developer are On Delay type. The time base depends on addressing. I believe T0-T199 are 10ms, and T200 up are 100ms (I might be off on that). There is a special timer function (STMR??) that has 4 outputs, one of which is an off delay. Otherwise you can create the off delay timer with the logic shown in the example. The manuals are in the downloads section on
www.meau.com.